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This section contains the statutory basis and provides the purpose for which this part is issued.
(a) [Reserved]
(b) Purpose. Except as provided in part 88 of this chapter, this part states the conditions under which radio stations may be licensed and used in the aviation services. These rules do not govern U.S. Government radio stations.
Aeronautical advisory station (unicom). An aeronautical station used for advisory and civil defense communications primarily with private aircraft stations.
Aeronautical enroute station. An aeronautical station which communicates with aircraft stations in flight status or with other aeronautical enroute stations.
Aeronautical fixed service. A radiocommunication service between specified fixed points provided primarily for the safety of air navigation and for the regular, efficient and economical operation of air transport. A station in this service is an aeronautical fixed station.
Aeronautical Mobile Off-Route (OR) Service. An aeronautical mobile service intended for communications, including those relating to flight coordination, primarily outside national or international civil air routes.(RR)
Aeronautical Mobile Route (R) Service. An aeronautical mobile service reserved for communications relating to safety and regularity of flight, primarily along national or international civil air routes.(RR)
Aeronautical Mobile-Satellite Off-Route (OR) Service. An aeronautical mobile-satellite service intended for communications, including those relating to flight coordination, primarily outside national and international civil air routes.(RR)
Aeronautical Mobile-Satellite Route (R) Service. An aeronautical mobile-satellite service reserved for communications relating to safety and regularity of flights, primarily along national or international civil air routes.(RR)
Aeronautical Mobile-Satellite Service. A mobile-satellite service in which mobile earth stations are located on board aircraft.
Aeronautical mobile service. A mobile service between aeronautical stations and aircraft stations, or between aircraft stations, in which survival craft stations may also participate; emergency position-indicating radiobeacon stations may also participate in this service on designated distress and emergency frequencies.
Aeronautical multicom station. An aeronautical station used to provide communications to conduct the activities being performed by, or directed from, private aircraft.
Aeronautical radionavigation service. A radionavigation service intended for the benefit and for the safe operation of aircraft.
Aeronautical search and rescue station. An aeronautical station for communication with aircraft and other aeronautical search and rescue stations pertaining to search and rescue activities with aircraft.
Aeronautical station. A land station in the aeronautical mobile service. In certain instances an aeronautical station may be located, for example, on board ship or on a platform at sea.
Aeronautical utility mobile station. A mobile station used on airports for communications relating to vehicular ground traffic.
Air carrier aircraft station. A mobile station on board an aircraft which is engaged in, or essential to, the transportation of passengers or cargo for hire.
Aircraft data link system. A system used to provide data communications between the aircraft and ground personnel necessary for the safe, efficient and economic operation of the aircraft.
Aircraft data link land test station. A station which is used to test and calibrate aircraft data link system communications equipment.
Aircraft earth station (AES). A mobile earth station in the aeronautical mobile-satellite service located on board an aircraft.
Aircraft station. A mobile station in the aeronautical mobile service other than a survival craft station, located on board an aircraft.
Air operations area. All airport areas where aircraft can operate, either under their own power or while in tow. The airport operations area includes runways, taxiways, apron areas, and all unpaved surfaces within the airport's perimeter fence. An apron area is a surface in the air operations area where aircraft park and are serviced (refueled, loaded with cargo, and/or boarded by passengers).
Airport. An area of land or water that is used or intended to be used for the landing and takeoff of aircraft, and includes its buildings and facilities, if any.
Airport control tower (control tower) station. An aeronautical station providing communication between a control tower and aircraft.
Automatic dependent surveillance—broadcast (ADS-B) Service. Broadcast transmissions from aircraft, supporting aircraft-to-aircraft, aircraft-to-ground, or aircraft-to-space station surveillance applications, including position reports, velocity vector, intent, and other relevant information about the aircraft.
Automatic terminal information service-broadcast (ATIS-B). The automatic provision of current, routine information to arriving and departing aircraft throughout a 24-hour period or a specified portion thereof.
Automatic weather observation station (AWOS) or automatic surface observation station (ASOS). A land station located at an airport and used to automatically transmit weather information to aircraft.
Aviation service organization. Any business firm which maintains facilities at an airport for the purposes of one or more of the following general aviation activities:
(a) Aircraft fueling;
(b) Aircraft services (e.g. parking, storage, tie-downs);
(c) Aircraft maintenance or sales;
(d) Electronics equipment maintenance or sales;
(e) Aircraft rental, air taxi service or flight instructions; and
(f) Baggage and cargo handling, and other passenger or freight services.
Aviation services. Radio-communication services for the operation of aircraft. These services include aeronautical fixed service, aeronautical mobile service, aeronautical radiodetermination service, and secondarily, the handling of public correspondence on frequencies in the maritime mobile and maritime mobile satellite services to and from aircraft.
Aviation support station. An aeronautical station used to coordinate aviation services with aircraft and to communicate with aircraft engaged in unique or specialized activities. (See subpart K)
Differential GPS (DGPS). A system which transmits corrections to the GPS derived position.
Emergency locator transmitter (ELT). A transmitter of an aircraft or a survival craft actuated manually or automatically that is used as an alerting and locating aid for survival purposes.
Emergency locator transmitter (ELT) test station. A land station used for testing ELTs or for training in the use of ELTs.
Expendable Launch Vehicle (ELV). A booster rocket that can be used only once to launch a payload, such as a missile or space vehicle.
Flight Information Service-Broadcast (FIS-B). A broadcast service provided for the purpose of giving advice and information useful for the safe and efficient conduct of flights.
Flight telemetering mobile station. A telemetering mobile station used for transmitting data from an airborne vehicle, excluding data related to airborne testing of the vehicle itself (or major components thereof).
Flight test aircraft station. An aircraft station used in the testing of aircraft or their major components.
Flight test land station. An aeronautical station used in the testing of aircraft or their major components.
Glide path station. A radionavigation land station which provides vertical guidance to aircraft during approach to landing.
Instrument landing system (ILS). A radionavigation system which provides aircraft with horizontal and vertical guidance just before and during landing and, at certain fixed points, indicates the distance to the reference point of landing.
Instrument landing system glide path. A system of vertical guidance embodied in the instrument landing system which indicates the vertical deviation of the aircraft from its optimum path of descent.
Instrument landing system localizer. A system of horizontal guidance embodied in the instrument landing system which indicates the horizontal deviation of the aircraft from its optimum path of descent along the axis of the runway or along some other path when used as an offset.
Land station. A station in the mobile service not intended to be used while in motion.
Localizer station. A radionavigation land station which provides horizontal guidance to aircraft with respect to a runway center line.
Marker beacon station. A radionavigation land station in the aeronautical radionavigation service which employs a marker beacon. A marker beacon is a transmitter which radiates vertically a distinctive pattern for providing position information to aircraft.
Mean power (of a radio transmitter). The average power supplied to the antenna transmission line by a transmitter during an interval of time sufficiently long compared with the lowest frequency encountered in the modulation taken under normal operating conditions.
Microwave landing system. An instrument landing system operating in the microwave spectrum that provides lateral and vertical guidance to aircraft having compatible avionics equipment.
Mobile service. A radiocommunication service between mobile and land stations, or between mobile stations. A mobile station is intended to be used while in motion or during halts at unspecified points.
Operational fixed station. A fixed station, not open to public correspondence, operated by and for the sole use of persons operating their own radiocommunication facilities in the public safety, industrial, land transportation, marine, or aviation services.
Peak envelope power (of a radio transmitter). The average power supplied to the antenna transmission line by a transmitter during one radio frequency cycle at the crest of the modulation envelope taken under normal operating conditions.
Private aircraft station. A mobile station on board an aircraft not operated as an air carrier. A station on board an air carrier aircraft weighing less than 12,500 pounds maximum certified takeoff gross weight may be licensed as a private aircraft station.
Racon station. A radionavigation land station which employs a racon. A racon (radar beacon) is a transmitter-receiver associated with a fixed navigational mark, which when triggered by a radar, automatically returns a distinctive signal which can appear on the display of the triggering radar, providing range, bearing and identification information.
Radar. A radiodetermination system based upon the comparison of reference signals with radio signals reflected, or re-transmitted, from the position to be determined.
Radio altimeter. Radionavigation equipment, on board an aircraft or spacecraft, used to determine the height of the aircraft or spacecraft above the Earth's surface or another surface.
Radiobeacon station. A station in the radionavigation service the emissions of which are intended to enable a mobile station to determine its bearing or direction in relation to the radiobeacon station.
Radiodetermination service. A radiocommuncation service which uses radiodetermination. Radiodetermination is the determination of the position, velocity and/or other characteristics of an object, or the obtaining of information relating to these parameters, by means of the propagation of radio waves. A station in this service is called a radiodetermination station.
Radiolocation service. A radiodetermination service for the purpose of radiolocation. Radiolocation is the use of radiodetermination for purposes other than those of radionavigation.
Radionavigation land test stations. A radionavigation land station which is used to transmit information essential to the testing and calibration of aircraft navigational aids, receiving equipment, and interrogators at predetermined surface locations. The Maintenance Test Facility (MTF) is used primarily to permit maintenance testing by aircraft radio service personnel. The Operational Test Facility (OTF) is used primarily to permit the pilot to check a radionavigation system aboard the aircraft prior to takeoff.
Radionavigation service. A radiodetermination service for the purpose of radionavigation. Radionavigation is the use of radiodetermination for the purpose of navigation, including obstruction warning.
Re-usable launch vehicle (RLV). A booster rocket that can be recovered after launch, refurbished and re-launched.
Surveillance radar station. A radionavigation land station in the aeronautical radionavigation service employing radar to detect the presence of aircraft within its range.
Survival craft station. A mobile station in the maritime or aeronautical mobile service intended solely for survival purposes and located on any lifeboat, life raft or other survival equipment.
Traffic information services—broadcast (TIS-B). Traffic information broadcasts derived from ground-based radar systems.
Universal access transceiver (UAT). A radio datalink system authorized to operate on the frequency 978 MHz to support Automatic Dependent Surveillance—Broadcast (ADS-B) Service, Traffic Information Services—Broadcast (TIS-B) and Flight Information Service—Broadcast (FIS-B).
VHF Omni directional range station (VOR). A radionavigation land station in the aeronautical radionavigation service providing direct indication of the bearing (omni-bearing) of that station from an aircraft.
(a) Except as noted in paragraph (b) of this section, stations in the aviation service must be licensed by the FCC either individually or by fleet.
(b) An aircraft station is licensed by rule and does not need an individual license issued by the FCC if the aircraft station is not required by statute, treaty, or agreement to which the United States is signatory to carry a radio, and the aircraft station does not make international flights or communications. Even though an individual license is not required, an aircraft station licensed by rule must be operated in accordance with all applicable operating requirements, procedures, and technical specifications found in this part.
(a) General. Foreign governments or their representatives cannot hold station licenses.
(b) Aeronautical enroute and aeronautical fixed stations. The following persons cannot hold an aeronautical enroute or an aeronautical fixed station license.
(1) Any alien or the representative of any alien;
(2) Any corporation organized under the laws of any foreign government;
(3) Any corporation of which more than one-fifth of the capital stock is owned of record or voted by aliens or their representatives or by a foreign government or its representative, or by a corporation organized under the laws of a foreign country; or
(4) Any corporation directly or indirectly controlled by any other corporation of which more than one-fourth of the capital stock is owned of record or voted by aliens, their representatives, or by a foreign government or its representatives, or by any corporation organized under the laws of a foreign country, if the Commission finds that the public interest will be served by the refusal or revocation of such license.
(a) [Reserved]
(b) An application must be filed with the Commission in accordance with part 1, subpart F of this chapter. Applications requiring fees as set forth at part 1, subpart G of this chapter must be filed in accordance with § 0.401(b) of the rules.
(c) One application may be submitted for the total number of aircraft stations in the fleet (fleet license).
(d)-(e) [Reserved]
Licenses for stations in the aviation services will normally be issued for a term of ten years from the date of original issuance, or renewal.
Transmitters listed in this part must be certificated for a particular use by the Commission based upon technical requirements contained in subpart D of this part.
(a) Applicant responsibilities. The applicant must propose frequencies to be used by the station consistent with the applicant's eligibility, the proposed operation and the frequencies available for assignment. Applicants must cooperate in the selection and use of frequencies in order to minimize interference and obtain the most effective use of stations. See subpart E and the appropriate subpart applicable to the class of station being considered.
(b) Licensing limitations. Frequencies are available for assignment to stations on a shared basis only and will not be assigned for the exclusive use of any licensee. The use of any assigned frequency may be restricted to one or more geographical areas.
(c) Government frequencies. Frequencies allocated exclusively to federal government radio stations may be licensed. The applicant for a government frequency must provide a satisfactory showing that such assignment is required for inter-communication with government stations or required for coordination with activities of the federal government. The Commission will coordinate with the appropriate government agency before a government frequency is assigned.
(d) Assigned frequency. The frequency coinciding with the center of an authorized bandwidth of emission must be specified as the assigned frequency. For single sideband emission, the carrier frequency must also be specified.
A station may be used for emergency communications in a manner other than that specified in the station license or in the operating rules when normal communication facilities are disrupted. The Commission may order the discontinuance f any such emergency service.
This section applies only to unicom stations and radionavigation land stations, excluding radionavigation land test stations. When a new license has been issued or additional operating frequencies have been authorized, the station or frequencies must be placed in operation no later than one year from the date of the grant. The licensee must notify the Commission in accordance with § 1.946 of this chapter that the station or frequencies have been placed in operation.
A person may apply for a portable aircraft radio station license if the need exists to operate the same station on more than one U.S. aircraft.
(a) [Reserved]
(b) Aircraft earth stations authorized to operate in the Inmarsat space segment must display the Commission license together with the commissioning certificate issued by Inmarsat. Notwithstanding the requirements of this paragraph, aircraft earth stations may operate in the Inmarsat space segment without an Inmarsat-issued commissioning certificate if written approval is obtained from Inmarsat in addition to the license from the Commission.
The licensee may make routine maintenance tests on equipment other than emergency locator transmitters if there is no interference with the communications of any other station. Procedures for conducting tests on emergency locator transmitters are contained in subpart F.
A licensed operator must measure the operating frequencies of all land-based transmitters at the following times:
(a) When the transmitter is originally installed;
(b) When any change or adjustment is made in the transmitter which may affect an operating frequency; or
(c) When an operating frequency has shifted beyond tolerance.
A general radiotelephone operator must directly supervise and be responsible for all transmitter adjustments or tests during installation, servicing or maintenance of a radio station. A general radiotelephone operator must be responsible for the proper functioning of the station equipment.
The owner of each antenna structure required to be painted and/or illuminated under the provisions of Section 303(q) of the Communications Act of 1934, as amended, shall operate and maintain the antenna structure painting and lighting in accordance with part 17 of this chapter. In the event of default by the owner, each licensee or permittee shall be individually responsible for conforming to the requirements pertaining to antenna structure painting and lighting.
The licensee must make the station and its records available for inspection upon request.
(a) [Reserved]
(b) The following licenses are issued by the Commission. International classification, if different from the license name, is given in parentheses. The licenses and their alphanumeric designator are listed in descending order.
(1)-(3) [Reserved]
(4) T. Radiotelegraph Operator License.
(5) G General Radiotelephone Operator Licenes (radiotelephone operator's general certificate)
(6) MP Marine Radio Operator Permit (radiotelephone operator's restricted certificate)
(7) RP Restricted Radiotelephone Operator Permit (radiotelephone operator's restricted certificate)
(a) A station operator must hold a commercial radio operator license or permit, except as listed in paragraph (d).
(b) The minimum operator license or permit required for operation of each specific classification is:
Minimum Operator License or Permit
Land stations, all classes
—All frequencies except VHF telephony transmitters providing domestic service
RP
Aircraft stations, all classes
—Frequencies below 30 MHz allocated exclusively to aeronautical mobile services
RP
—Frequencies below 30 MHz not allocated exclusively to aeronautical mobile services
MP or higher
—Frequencies above 30 MHz not allocated exclusively to aeronautical mobile services and assigned for international use
MP or higher
—Frequencies above 30 MHz not assigned for international use
none
—Frequencies not used solely for telephone or exceeding 250 watts carrier power or 1000 watts peak envelope power
G or higher
(c) The operator of a telephony station must directly supervise and be responsible for any other person who transmits from the station, and must ensure that such communications are in accordance with the station license.
(d) No operator license is required to:
(1) Operate an aircraft radar set, radio altimeter, transponder or other aircraft automatic radionavigation transmitter by flight personnel;
(2) Test an emergency locator transmitter or a survival craft station used solely for survival purposes;
(3) Operate an aeronautical enroute station which automatically transmits digital communications to aircraft stations;
(4) Operate a VHF telephony transmitter providing domestic service or used on domestic flights.
The holder of a marine radio operator permit or a restricted radiotelephone operator permit must perform only transmitter operations which are controlled by external switches. These operators must not perform any internal adjustment of transmitter frequency determining elements. Further, the stability of the transmitter frequencies at a station operated by these operators must be maintained by the transmitter itself. When using an aircraft radio station on maritime mobile service frequencies the carrier power of the transmitter must not exceed 250 watts (emission A3E) or 1000 watts (emission R3E, H3E, or J3E).
(a) Stations at fixed locations. The license or a photocopy must be posted or retained in the station's permanent records.
(b) Aircraft radio stations. The license must be either posted in the aircraft or kept with the aircraft registration certificate. If a single authorization covers a fleet of aircraft, a copy of the license must be either posted in each aircraft or kept with each aircraft registration certificate.
(c) Aeronautical mobile stations. The license must be retained as a permanent part of the station records.
All operator permits or licenses must be readily available for inspection.
(a) Aircraft station. Identify by one of the following means:
(1) Aircraft radio station call sign.
(2) The type of aircraft followed by the characters of the registration marking (“N” number) of the aircraft, omitting the prefix letter “N.” When communication is initiated by a ground station, an aircraft station may use the type of aircraft followed by the last three characters of the registration marking. Notwithstanding any other provision of this section, an aircraft being moved by maintenance personnel from one location in an airport to another location in that airport may be identified by a station identification consisting of the name of the company owning or operating the aircraft, followed by the word “Maintenance” and additional alphanumeric characters of the licensee's choosing.
(3) The FAA assigned radiotelephony designator of the aircraft operating organization followed by the flight identification number.
(4) An aircraft identification approved by the FAA for use by aircraft stations participating in an organized flying activity of short duration.
(b) Land and fixed stations. Identify by means of radio station call sign, its location, its assigned FAA identifier, the name of the city area or airport which it serves, or any additional identification required. An aeronautical enroute station which is part of a multistation network may also be identified by the location of its control point.
(c) Survival craft station. Identify by transmitting a reference to its parent aircraft. No identification is required when distress signals are transmitted automatically. Transmissions other than distress or emergency signals, such as equipment testing or adjustment, must be identified by the call sign or by the registration marking of the parent aircraft followed by a single digit other than 0 or 1.
(d) Exempted station. The following types of stations are exempted from the use of a call sign: Airborne weather radar, radio altimeter, air traffic control transponder, distance measuring equipment, collision avoidance equipment, racon, radio relay, radionavigation land test station (MTF), and automatically controlled aeronautical enroute stations.
(a) A station at a fixed location in the international aeronautical mobile service must maintain a log in accordance with Annex 10 of the ICAO Convention.
(b) A station log must contain the following information:
(1) The name of the agency operating the station.
(2) The identification of the station.
(3) The date.
(4) The time of opening and closing the station.
(5) The frequencies being guarded and the type of watch (continuous or scheduled) being maintained on each frequency.
(6) Except at intermediate mechanical relay stations where the provisions of this paragraph need not be complied with, a record of each communication showing text of communication, time communications completed, station(s) communicated with, and frequency used.
(7) All distress communications and action thereon.
(8) A brief description of communications conditions and difficulties, including harmful interference. Such entries should include, whenever practicable, the time at which interference was experienced, the character, radio frequency and identification of the interfering signal.
(9) A brief description of interruption to communications due to equipment failure or other troubles, giving the duration of the interruption and action taken.
(10) Such additional information as may be considered by the operator to be of value as part of the record of the stations operations.
(c) Stations maintaining written logs must also enter the signature of each operator, with the time the operator assumes and relinquishes a watch.
The licensee of any airport control tower station or radionavigation land station must notify the nearest FAA regional office upon the temporary suspension or permanent discontinuance of the station. The FAA regional office must be notified again when service resumes.
The following table lists authorized emissions and maximum power. Power must be determined by direct measurement.
Class of station
Frequency band/frequency
Authorized emission(s) 9
Maximum power 1
Aeronautical advisory
VHF
A3E
10 watts. 10
Aeronautical multicom
VHF
A3E
10 watts.
Aeronautical enroute and aeronautical fixed
HF
R3E, H3E, J3E, J7B, H2B, J2D
6 kw.
HF
A1A, F1B, J2A, J2B
1.5 kw.
VHF
A3E, A9W G1D, A2D
Aeronautical search and rescue
VHF HF
A3E R3E, H3E, J3E
10 watts. 100 watts.
Operational fixed
VHF
G3E, F2D
30 watts.
Flight test land
VHF
A3E
200 watts.
UHF
F2D, F9D, F7D
25 watts. 3
HF
H2B, J3E, J7D, J9W
6.0 kw.
Aviation support
VHF
A3E
50 watts.
Airport control tower
VHF
A3E, G1D, G7D
50 watts.
Below 400 kHz
A3E
15 watts.
Aeronautical utility mobile
VHF
A3E
10 watts.
1090 MHz
M1D
20 watts.
Aircraft data link land test
131.450 MHz, 131.550 MHz, 131.725 MHz, 131.825 MHz, 136.850 MHz
A2D
100 microwatts.
136.900 MHz, 136.925 MHz, 136.950 MHz, 136.975 MHz
G1D
100 microwatts.
Radionavigation land test
108.150 MHz
A9W
1 milliwatt.
334.550 MHz
A1N
1 milliwatt.
Other VHF
M1A, XXA, A1A, A1N, A2A, A2D, A9W
1 watt.
Other UHF
M1A, XXA, A1A, A1N, A2A, A2D, A9W
1 watt.
5031.0 MHz
F7D
1 watt.
Radionavigation land
Various 4
Various 4
Various. 4
Aeronautical Frequencies
Aircraft (Communication)
UHF
F2D, F9D, F7D
25 watts.
VHF
A3E, A9W, G1D, G7D, A2D
55 watts.
HF
R3E, H3E, J3E, J7B, H2B, J7D, J9W
400 watts.
HF
A1A, F1B, J2A, J2B
100 watts.
Marine Frequencies 5
156.300 MHz
G3E
5 watts.
156.375 MHz
G3E
5 watts.
156.400 MHz
G3E
5 watts.
156.425 MHz
G3E
5 watts.
156.450 MHz
G3E
5 watts.
156.625 MHz
G3E
5 watts.
156.800 MHz
G3E
5 watts.
156.900 MHz
G3E
5 watts.
157.425 MHz
G3E
5 watts.
HF 6
R3E, H3E, J3E, J2B, F1B, A3E
1000 watts. 250 watts.
MF 6
R3E, H3E, J3E, J2B, F1B
1000 watts.
HF 6
A3E
250 watts.
(Radionavigation)
Various 7
Various 7
Various. 7
Aircraft earth
UHF
G1D, G1E, G1W
60 watts. 8
Differential GPS
VHF
G7D
Various. 2
1 The power is measured at the transmitter output terminals and the type of power is determined according to the emission designator as follows:
(i) Mean power (pY) for amplitude modulated emissions and transmitting both sidebands using unmodulated full carrier.
(ii) Peak envelope power (pX) for all emission designators other than those referred to in paragraph (i) of this note.
2 Power and antenna height are restricted to the minimum necessary to achieve the required service.
3 Transmitter power may be increased to overcome line and duplexer losses but must not exceed 25 watts delivered to the antenna.
4 Frequency, emission, and maximum power will be determined after coordination with appropriate Government agencies.
5 To be used with airborne marine equipment certificated for part 80 (ship) and used in accordance with part 87.
6 Applicable onIy to marine frequencies used for public correspondence.
7 Frequency, emission, and maximum power will be determined by appropriate standards during the certification process.
8 Power may not exceed 60 watts per carrier, as measured at the input of the antenna subsystem, including any installed diplexer. The maximum EIRP may not exceed 2000 watts per carrier.
9 Excludes automatic link establishment.
10 Power is limited to 0.5 watt, but may not exceed 2 watts when station is used in an automatic unattended mode.
(a) Except as provided in paragraphs (c), (d), (f), and (g) of this section, the carrier frequency of each station must be maintained within these tolerances:
Frequency band (lower limit exclusive, upper limit inclusive), and categories of stations
Tolerance 1
Tolerance 2
(1) Band-9 to 535 kHz:
Aeronautical stations
100
100
Aircraft stations
200
100
Survival craft stations on 500 kHz
5,000
20 Hz 3
Radionavigation stations
100
100
(2) Band-1605 to 4000 kHz:
Aeronautical fixed stations:
Power 200 W or less
100
100 8
Power above 200 W
50
50 8
Aeronautical stations:
Power 200 W or less
100 7
100 7 8
Power above 200 W
50 7
50 7 8
Aircraft stations
100 7
100 7
Survival craft stations on 2182 kHz
200
20 Hz 3
(3) Band-4 to 29.7 MHz:
Aeronautical fixed stations:
Power 500 W or less
50
Power above 500 W
15
Single-sideband and Independent-sideband emission:
Power 500 W or less
50 Hz
Power above 500 W
20 Hz
Class F1B emissions
10 Hz
Other classes of emission:
Power 500 W or less
20
Power above 500 W
10
Aeronautical stations:
Power 500 W or less
7 100
100 7
Power above 500 W
7 50
50 7
Aircraft stations
7 100
100 7
Survival craft stations on 8364 kHz
200
50 Hz 3
(4) Band-29.7 to 100 MHz:
Aeronautical fixed stations:
Power 200 W or less
50
Power above 200 W
30
Power 50 W or less
30
Power above 50 W
20
Operational fixed stations:
73-74.6 MHz (Power 50 W or less)
50
30
73-74.6 MHz (Power above 50 W)
20
20
72-73.0 MHz and 75.4-76.0 MHz
5
5
Radionavigation stations
100
50
(5) Band-108 to 137 MHz:
Aeronautical stations
4 50
12 20
Emergency locator transmitter test stations
50
50
Survival craft stations on 121.5 MHz
50
50
Emergency locator stations
50
50
Aircraft and other mobile stations in the Aviation Services
5 50
13 30
Radionavigation stations
20
20
Differential GPS
2
(6) Band-137 to 470MHz:
Aeronautical stations
50
20
Survival craft stations on 243 MHz
50
50
Aircraft stations
50 5
30 10
Radionavigation stations
50
50
Emergency locator transmitters on 406 MHz
N/A
5
(7) Band-470 to 2450 MHz:
Aeronautical stations
100
20
Aircraft stations
100
20
Aircraft earth station
320 Hz 11
Aeronautical utility mobile stations on 1090 MHz
1000
1000
Radionavigation stations:
470-960 MHz
500
500
960-1215 MHz
20
20
1215-2450 MHz
500
500
(8) Band-2450 to 10500 MHz:
Radionavigation stations
6 9 1250
1250 6 9
(9) Band-10.5 GHz to 40 GHz:
Radionavigation stations
5000
5000
1 This tolerance is the maximum permitted until January 1, 1990, for transmitters installed before January 2, 1985, and used at the same installation. Tolerance is indicated in parts in 10 6 unless shown as Hertz (Hz).
2 This tolerance is the maximum permitted after January 1, 1985 for new and replacement transmitters and to all transmitters after January 1, 1990. Tolerance is indicated in parts in 10 6 unless shown as Hertz (Hz).
3 For transmitters first approved after November 30, 1977.
4 The tolerance for transmitters approved between January 1, 1966, and January 1, 1974, is 30 parts in 10 6 . The tolerance for transmitters approved after January 1, 1974, and stations using offset carrier techniques is 20 parts in 10 6 .
5 The tolerance for transmitters approved after January 1, 1974, is 30 parts in 10 6 .
6 In the 5000 to 5250 MHz band, the FAA requires a tolerance of ±10 kHz for Microwave Landing System stations which are to be a part of the National Airspace System (FAR 171).
7 For single-sideband transmitters operating in the frequency bands 1605-4000 kHz and 4-29.7 MHz which are allocated exclusively to the Aeronautical Mobile (R) Service, the tolerance is: Aeronautical stations, 10 Hz; aircraft stations, 20 Hz.
8 For single-sideband radiotelephone transmitters the tolerance is: In the bands 1605-4000 kHz and 4-29.7 MHz for peak envelope powers of 200 W or less and 500 W or less, respectively, 50 Hz; in the bands 1605-4000 kHz and 4-29.7 MHz for peak envelope powers above 200 W and 500 W, respectively, 20 Hz.
9 Where specific frequencies are not assigned to radar stations, the bandwidth occupied by the emissions of such stations must be maintained within the band allocated to the service and the indicated tolerance does not apply.
10 Until January 1, 1997, the maximum frequency tolerance for transmitters with 50 kHz channel spacing installed before January 2, 1985, is 50 parts in 10 6 .
11 For purposes of certification, a tolerance of 160 Hz applies to the reference oscillator of the AES transmitter. This is a bench test.
12 For emissions G1D and G7D, the tolerance is 2 parts per 10 6 .
13 For emissions G1D and G7D, the tolerance is 5 parts per 10 6 .
(b) The power shown in paragraph (a) of this section is the peak envelope power for single-sideband transmitters and the mean power for all other transmitters.
(c) For single-sideband transmitters, the tolerance is:
(1) All aeronautical stations on land—10 Hz.
(2) All aircraft stations—20 Hz.
(d) For radar transmitters, except non-pulse signal radio altimeters, the frequency at which maximum emission occurs must be within the authorized frequency band and must not be closer than 1.5/T MHz to the upper and lower limits of the authorized bandwidth, where T is the pulse duration in microseconds.
(e) The Commission may authorize tolerances other than those specified in this section upon a satisfactory showing of need.
(f) The carrier frequency tolerance of all transmitters that operate in the 1435-1525 MHz or 2345-2395 MHz band is 0.002 percent. The carrier frequency tolerance of all transmitters that operate in the 5091-5150 MHz band is 0.005 percent.
(g) Any aeronautical enroute service transmitter operating in U.S. controlled airspace with 8.33 kHz channel spacing (except equipment being tested by avionics equipment manufacturers and flight test stations prior to delivery to their customers for use outside U.S. controlled airspace) must achieve 0.0005% frequency stability when operating in that mode.
(a) Occupied bandwidth is the width of a frequency band such that, below the lower and above the upper frequency limits, the mean powers emitted are each equal to 0.5 percent of the total mean power of a given emission.
(b) The authorized bandwidth is the maximum occupied bandwidth authorized to be used by a station.
(c) The necessary bandwidth for a given class of emission is the width of the frequency band which is just sufficient to ensure the transmission of information at the rate and with the quality required under specified conditions.
(a) The assignable emissions, corresponding emission designators and authorized bandwidths are as follows:
Class of emission
Emission designator
Authorized bandwidth (kilohertz)
Below 50 MHz
Above 50 MHz
Frequency deviation
A1A 1
100HA1A
0.25
A1N
300HA1N
0.75
A2A
2K04A2A
2.74
50
A2D
6K0A2D
50
A2D 5
13K0A2D
50
A3E 2
6K00A3E
50 3
A3E
5K6A3E
8.33 kHz 17
A3X 4
3K20A3X
25
A9W 5
13K0A9W
25
F1B 1
1K70F1B
1.7
F1B 1
2K40F1B
2.5
F1D 18
1M30F1D
1300 kHz
312.5 kHz
F2D
5M0F2D
( 9 )
F3E 6
16K0F3E
20
5
F3E 7
36K0F3E
40
15
F7D 8
5M0F7D
9
F9D
5M0F9D
9
G1D
16K0G1D
20 kHz
G1D 16
21K0G1D
25
G1D
14K0G1D
25
F9D
5M0F9D
9
G1D
16K0G1D
20 kHz
G3E 6
16K0G3E
20
5
G7D
14K0G7D
25
H2B 10 11
2K80H2B
3.0
H3E 11 12
2K80H3E
3.0
J2A 1
100HJ2A
0.25
J2B 1
1K70J2B
1.7
2K40J2B
2.5
J3E 11 12
2K80J3E
3.0
J7B 11
2K80J7B
3.0
J7D
5M0J7D
9
J9W 11
2K80J9W
3.0
M1A
620HM1A
M1D
14M0M1D
14.0
NON
NON
None 15
PON 13
9
9
R3E 11 12
2K80R3E
3.0
XXA 14
1K12XXA
2.74
Notes:
1 A1A, F1B, J2A and J2B are permitted provided they do not cause harmful interference to H2B, J3E, J7B and J9W.
2 For use with an authorized bandwidth of 8.0 kilohertz at radiobeacon stations. A3E will not be authorized:
(i) At existing radiobeacon stations that are not authorized to use A3 and at new radiobeacon stations unless specifically recommended by the FAA for safety purposes.
(ii) At existing radiobeacon stations currently authorized to use A3, subsequent to January 1, 1990, unless specifically recommended by the FAA for safety purposes.
3 In the band 117.975-136 MHz, the authorized bandwidth is 25 kHz for transmitters approved after January 1, 1974.
4 Applicable only to Survival Craft Stations and to the emergency locator transmitters and emergency locator transmitter test stations employing modulation in accordance with that specified in § 87.141 of the Rules. The specified bandwidth and modulation requirements shall apply to emergency locator transmitters for which approval is granted after October 21, 1973.
5 This emission may be authorized for audio frequency shift keying and phase shift keying for digital data links on any frequency listed in § 87.263(a)(1), § 87.263(a)(3) or § 87.263(a)(5). 13K0A2D emission may be authorized on frequencies not used for voice communications. If the channel is used for voice communications, 13K0A9W emission may be authorized, provided the data is multiplexed on the voice carrier without derogating voice communications.
6 Applicable to operational fixed stations in the bands 72.0-73.0 MHz and 75.4-76.0 MHz and to CAP stations using F3 on 143.900 MHz and 148.150 MHz.
7 Applicable to operational fixed stations presently authorized in the band 73.0-74.6 MHz.
8 The authorized bandwidth is equal to the necessary bandwidth for frequency or digitally modulated transmitters used in aeronautical telemetering and associated aeronautical telemetry or telecommand stations that operate in the 1435-1525 MHz, 2345-2395 MHz, or 5091-5150 MHz band. The necessary bandwidth must be computed in accordance with part 2 of this chapter.
9 To be specified on license.
10 H2B must be used by stations employing digital selective calling.
11 For A1A, F1B and single sideband emissions, except H2B, the assigned frequency must be 1400 Hz above the carrier frequency.
12 R3E, H3E, and J3E will be authorized only below 25000 kHz. Only H2B, J3E, J7B, and J9W are authorized, except that A3E and H3E may be used only on 3023 kHz and 5680 kHz for search and rescue operations.
13 The letters “K, L, M, Q, V, W, and X” may also be used in place of the letter “P” for pulsed radars.
14 Authorized for use at radiobeacon stations.
15 Applicable only to transmitters of survival craft stations, emergency locator transmitter stations and emergency locator transmitter test stations approved after October 21, 1973.
16 Authorized for use by aircraft earth stations. Lower values of necessary and authorized bandwidth are permitted.
17 In the band 117.975-137 MHz, the Commission will not authorize any 8.33 kHz channel spaced transmissions or the use of their associated emission designator within the U.S. National Airspace System, except, on an optional basis, by Aeronautical Enroute Stations and Flight Test Stations, or by avionics equipment manufacturers which are required to perform installation and checkout of such radio systems prior to delivery to their customers. For transmitters certificated to tune to 8.33 kHz channel spacing as well as 25 kHz channel spacing, the authorized bandwidth is 8.33 kHz when tuned to an 8.33 kHz channel.
18 Authorized only for Universal Access Transceiver use at 978 MHz.
(b) For other emissions, an applicant must determine the emission designator by using part 2 of this chapter.
(c) A license to use radiotelephony includes the use of tone signals or signaling devices whose sole function is to establish or maintain voice communications.
(a) Except for ELTs and when using single sideband (R3E, H3E, J3E), or frequency modulation (F9) or digital modulation (F9Y) for telemetry or telecommand in the 1435-1525 MHz, 2345-2395 MHz, or 5091-5150 MHz band or digital modulation (G7D) for differential GPS, the mean power of any emissions must be attenuated below the mean power of the transmitter (pY) as follows:
(1) When the frequency is removed from the assigned frequency by more than 50 percent up to and including 100 percent of the authorized bandwidth the attenuation must be at least 25 dB;
(2) When the frequency is removed from the assigned frequency by more than 100 percent up to and including 250 percent of the authorized bandwidth the attenuation must be at least 35 dB.
(3) When the frequency is removed from the assigned frequency by more than 250 percent of the authorized bandwidth the attenuation for aircraft station transmitters must be at least 40 dB; and the attenuation for aeronautical station transmitters must be at least 43 + 10 log 10 pY dB.
(b) For aircraft station transmitters and for aeronautical station transmitters first installed before February 1, 1983, and using H2B, H3E, J3E, J7B or J9W, the mean power of any emissions must be attenuated below the mean power of the transmitter (pY) as follows:
(1) When the frequency is removed from the assigned frequency by more than 50 percent up to and including 150 percent of the authorized bandwidth of 4.0 kHz, the attenuation must be at least 25 dB.
(2) When the frequency is removed from the assigned frequency by more than 150 percent up to and including 250 percent of the authorized bandwidth of 4.0 kHz, the attenuation must be at least 35 dB.
(3) When the frequency is removed from the assigned frequency by more than 250 percent of the authorized bandwidth of 4.0 kHz for aircraft station transmitters the attenuation must be at least 40 dB; and for aeronautical station transmitters the attenuation must be at least 43 + 10 log 10 pY dB.
(c) For aircraft station transmitters first installed after February 1, 1983, and for aeronautical station transmitters in use after February 1, 1983, and using H2B, H3E, J3E, J7B or J9W, the peak envelope power of any emissions must be attenuated below the peak envelope power of the transmitter (pX) as follows:
(1) When the frequency is removed from the assigned frequency by more than 50 percent up to and including 150 percent of the authorized bandwidth of 3.0 kHz, the attenuation must be at least 30 dB.
(2) When the frequency is removed from the assigned frequency by more than 150 percent up to and including 250 percent of the authorized bandwidth of 3.0 kHz, the attenuation must be at least 38 dB.
(3) When the frequency is removed from the assigned frequency by more than 250 percent of the authorized bandwidth of 3.0 kHz for aircraft transmitters the attenuation must be at least 43 dB. For aeronautical station transmitters with transmitter power up to and including 50 watts the attenuation must be at least 43 + 10 log 10 pX dB and with transmitter power more than 50 watts the attenuation must be at least 60 dB.
(d) Except for telemetry in the 1435-1525 MHz band, when the frequency is removed from the assigned frequency by more than 250 percent of the authorized bandwidth for aircraft stations above 30 MHz and all ground stations the attenuation must be at least 43 + 10 log 10 pY dB.
(e) When using frequency modulation or digital modulation for telemetry or telecommand in the 1435-1525 MHz, 2345-2395 MHz, or 5091-5150 MHz band with an authorized bandwidth equal to or less than 1 MHz the emissions must be attenuated as follows:
(1) On any frequency removed from the assigned frequency by more than 100 percent of the authorized bandwidth up to and including 100 percent plus 0.5 MHz, the attenuation must be at least 60 dB, when measured in a 3.0 kHz bandwidth. This signal need not be attenuated more than 25 dB below 1 milliwatt.
(2) On any frequency removed from the assigned frequency by more than 100 percent of the authorized bandwidth plus 0.5 MHz, the attenuation must be at least 55 + 10 log 10 pY dB when measured in a 3.0 kHz bandwidth.
(f) When using frequency modulation or digital modulation for telemetry or telecommand in the 1435-1525 MHz, 2345-2395 MHz, or 5091-5150 MHz band with an authorized bandwidth greater than 1 MHz, the emissions must be attenuated as follows:
(1) On any frequency removed from the assigned frequency by more than 50 percent of the authorized bandwidth plus 0.5 MHz up to and including 50 percent of the authorized bandwidth plus 1.0 MHz, the attenuation must be 60 dB, when measured in a 3.0 kHz bandwidth. The signal need not be attenuated more than 25 dB below 1 milliwatt.
(2) On any frequency removed from the assigned frequency by more than 50 percent of the authorized bandwidth plus 1.0 MHz, the attenuation must be at least 55 + 10 log 10 pY dB, when measured in a 3.0 kHz bandwidth.
(g) The requirements of paragraphs (e) and (f) of this section apply to transmitters approved after January 1, 1977, and to all transmitters first installed after January 1, 1983.
(h) For ELTs operating on 121.500 MHz, 243.000 MHz and 406.0-406.1 MHz the mean power of any emission must be attenuated below the mean power of the transmitter (pY) as follows:
(1) When the frequency is moved from the assigned frequency by more than 50 percent up to and including 100 percent of the authorized bandwidth the attenuation must be at least 25 dB;
(2) When the frequency is removed from the assigned frequency by more than 100 percent of the authorized bandwidth the attenuation must be at least 30 dB.
(i) In case of conflict with other provisions of § 87.139, the provisions of this paragraph shall govern for aircraft earth stations. When using G1D, G1E, or G1W emissions in the 1646.5-1660.5 MHz frequency band, the emissions must be attenuated as shown below.
(1) At rated output power, while transmitting a modulated single carrier, the composite spurious and noise output shall be attenuated by at least:
Frequency (MHz)
Attenuation (dB) 1
0.01 to 1525
−135 dB/4 kHz
1525 to 1559
−203 dB/4 kHz
1559 to 1585
−155 dB/MHz
1585 to 1605
−143 dB/MHz
1605 to 1610
−117 dB/MHz
1610 to 1610.6
−95 dB/MHz
1610.6 to 1613.8
−80 dBW/MHz 3
1613.8 to 1614
−95 dB/MHz
1614 to 1626.5
−70 dB/4 kHz
1626.5 to 1660
−70 dB/4 kHz 2 3 4
1660 to 1670
−49.5 dBW/20 kHz 2 3 4
1670 to 1735
−60 dB/4 kHz
1735 to 12000
−105 dB/4 kHz
12000 to 18000
−70 dB/4 kHz
1 These values are expressed in dB referenced to the carrier for the bandwidth indicated, and relative to the maximum emission envelope level, except where the attenuation is shown in dBW, the attenuation is expressed in terms of absolute power referenced to the bandwidth indicated.
2 Attenuation measured within the transmit band excludes the band ±35 kHz of the carrier frequency.
3 This level is not applicable for intermodulation products.
4 The upper limit for the excess power for any narrow-band spurious emission (excluding intermodulation products within a 30 kHz measurement bandwidth) shall be 10 dB above the power limit in this table.
(2) The transmitter emission limit is a function of the modulation type and symbol rate (SR). Symbol Rate is expressed in symbols per second.
(3) While transmitting a single modulated signal at the rated output power of the transmitter, the emissions must be attenuated below the maximum emission level by at least:
Frequency Offset (normalized to SR)
Attenuation (dB)
±0.75 × SR
0
±1.40 × SR
20
±2.95 × SR
40
Where:
SR = Symbol Rate,
SR = 1 × channel rate for BPSK,
SR = 0.5 × channel rate for QPSK.
The mask shall be defined by drawing straight lines through the above points.
(j) When using G7D for differential GPS in the 112-118 MHz band, the amount of power during transmission under all operating conditions when measured over a 25 kHz bandwidth centered on either of the second adjacent channels shall not exceed −25 dBm and shall decrease 5 dB per octave until −52 dBm.
(k) For VHF aeronautical stations and aircraft stations operating with G1D or G7D emissions:
(1) The amount of power measured across either first adjacent 25 kHz channel shall not exceed 2 dBm.
(2) For stations first installed before January 1, 2002, the amount of power measured across either second adjacent channel shall be less than −25 dBm and the power measured in any other adjacent 25 kHz channels shall monotonically decrease at a rate of at least 5 dB per octave to a maximum value of −52 dBm. For stations first installed on or after January 1, 2002,
(i) The amount of power measured across either second adjacent 25 kHz channel shall be less than −28 dBm;
(ii) The amount of power measured across either fourth adjacent 25 kHz channel shall be less than −38 dBm; and
(iii) From thereon the power measured in any other adjacent 25 kHz channel shall monotonically decrease at a rate of at least 5 dB per octave to a maximum value of −53 dBm.
(3) The amount of power measured over a 16 kHz channel bandwidth centered on the first adjacent 25 kHz channel shall not exceed −18 dBm.
(l)(1) For Universal Access Transceiver transmitters, the average emissions measured in a 100 kHz bandwidth must be attenuated below the maximum emission level contained within the authorized bandwidth by at least:
Frequency (MHz)
Attenuation (dB)
±0.5
0
±1.0
18
±2.25
50
±3.25
60
(2) Universal Access Transceiver transmitters with an output power of 5 Watts or more must limit their emissions by at least 43 + 10 log (P) dB on any frequency removed from the assigned frequency by more than 250% of the authorized bandwidth. Those emissions shall be measured with a bandwidth of 100 kHz. P in the above equation is the average transmitter power measured within the occupied bandwidth in Watts.
(3) Universal Access Transceiver transmitters with less than 5 Watts of output power must limit their emissions by at least 40 dB relative to the carrier peak on any frequency removed from the assigned frequency by more than 250% of the authorized bandwidth. Those emissions shall be measured with a bandwidth of 100 kHz.
(m) In the 1435-1452 MHz band, operators of aeronautical telemetry stations are encouraged to take all reasonable steps to ensure that unwanted emissions power does not exceed −28 dBW/27 MHz in the 1400-1427 MHz band. Operators of aeronautical telemetry stations that do not meet this limit shall first attempt to operate in the 1452-1525 MHz band prior to operating in the 1435-1452 MHz band.
(a) When A3E emission is used, the modulation percentage must not exceed 100 percent. This requirement does not apply to emergency locator transmitters or survival craft transmitters.
(b) A double sideband full carrier amplitude modulated radiotelephone transmitter with rated carrier power output exceeding 10 watts must be capable of automatically preventing modulation in excess of 100 percent.
(c) If any licensed radiotelephone transmitter causes harmful interference to any authorized radio service because of excessive modulation, the Commission will require the use of the transmitter to be discontinued until it is rendered capable of automatically preventing modulation in excess of 100 percent.
(d) Single sideband transmitters must be able to operate in the following modes:
Carrier mode
Level N(dB) of the carrier with respect to peak envelope power
Full carrier (H3E)
O>N>−6.
Suppressed carrier (J3E)
Aircraft stations N<−26;
Aeronautical stations N<−40.
(e) Each frequency modulated transmitter operating in the band 72.0-76.0 MHz must have a modulation limiter.
(f) Each frequency modulated transmitter equipped with a modulation limiter must have a low pass filter between the modulation limiter and the modulated stage. At audio frequencies between 3 kHz and 15 kHz, the filter must have an attenuation greater than the attenuation at 1 kHz by at least 40 log 10 (f/3) db where “f” is the frequency in kilohertz. Above 15 kHz, the attenuation must be at least 28 db greater than the attenuation at 1 kHz.
(g) Except that symmetric side bands are not required, the modulation characteristics for ELTs must be in accordance with specifications contained in the Federal Aviation Administration (FAA) Technical Standard Order (TSO) Document TSO-C91a titled “Emergency Locator Transmitter (ELT) Equipment” dated April 29, 1985. TSO-C91a is incorporated by reference in accordance with 5 U.S.C. 552(a). TSO-C91a may be obtained from the Department of Transportation, Federal Aviation Administration, Office of Airworthiness, 800 Independence Avenue SW., Washington DC 20591.
(h) ELTs must use A3X emission and may use A3E or NON emissions on an optional basis while transmitting. Each transmission of a synthesized or recorded voice message from an ELT must be preceded by the words “this is a recording”; transmission of A3E or NON emission must not exceed 90 seconds; and any transmission of A3E or NON emissions must be followed by at least three minutes of A3X emission.
(i) ELTs manufactured on or after October 1, 1988, must have a clearly defined carrier frequency distinct from the modulation sidebands for the mandatory emission, A3X, and, if used, the A3E or NON emissions. On 121.500 MHz at least thirty per cent of the total power emitted during any transmission cycle with or without modulation must be contained within plus or minus 30 Hz of the carrier frequency. On 243.000 MHz at least thirty percent of the total power emitted during any transmission cycle with or without modulation must be contained within plus or minus 60 Hz of the carrier frequency. Additionally, if the type of emission is changed during transmission, the carrier frequency must not shift more than plus or minus 30 Hz on 121.500 MHz and not more than plus or minus 60Hz on 243.000 MHz. The long term stability of the carrier frequency must comply with the requirements in § 87.133 of this part.
(j) Transmitters used at Aircraft earth stations must employ BPSK for transmission rates up to and including 2400 bits per second, and QPSK for higher rates.
(k) Universal Access Transceiver transmitters must use F1D modulation without phase discontinuities.
(a) Each transmitter must be installed so that it is not accessible to, or capable of being operated by persons other than those authorized by the licensee.
(b) Each station must be provided with a control point at the location of the transmitting equipment, unless otherwise specifically authorized. Except for aeronautical enroute stations governed by paragraph (e) of this section, a control point is the location at which the radio operator is stationed. It is the position at which the transmitter(s) can immediately be turned off.
(c) Applicants for additional control points at aeronautical advisory (unicom) stations must specify the location of each proposed control point.
(d) Except for aeronautical enroute stations governed by paragraph (f) of this section, the control point must have the following facilities installed:
(1) A device that indicates when the transmitter is radiating or when the transmitter control circuits have been switched on. This requirement does not apply to aircraft stations;
(2) Aurally monitoring of all transmissions originating at dispatch points;
(3) A way to disconnect dispatch points from the transmitter; and
(4) A way to turn off the transmitter.
(e) A dispatch point is an operating position subordinate to the control point. Dispatch points may be installed without authorization from the Commission, and dispatch point operators are not required to be licensed.
(f) In the aeronautical enroute service, the control point for an automatically controlled enroute station is the computer facility which controls the transmitter. Any computer controlled transmitter must be equipped to automatically shut down after 3 minutes of continuous transmission of an unmodulated carrier.
(a) Each transmitter must be certificated for use in these services, except as listed in paragraph (c) of this section. However, aircraft stations which transmit on maritime mobile frequencies must use transmitters certificated for use in ship stations in accordance with part 80 of this chapter. Certification under part 80 is not required for aircraft earth stations transmitting on maritime mobile-satellite frequencies. Such stations must be certificated under part 87.
(b) Some radio equipment installed on air carrier aircraft must meet the requirements of the Commission and the requirements of the FAA. The FAA requirements may be obtained from the FAA, Aircraft Maintenance Division, 800 Independence Ave., SW., Washington, DC 20591.
(c) The equipment listed below is exempted from certification. The operation of transmitters which have not been certificated must not result in harmful interference due to the failure of those transmitters to comply with technical standards of this subpart.
(1) Flight test station transmitters for limited periods where justified.
(2) U.S. Government transmitters furnished in the performance of a U.S. Government contract if the use of certificated equipment would increase the cost of the contract or if the transmitter will be incorporated in the finished product. However, such equipment must meet the technical standards contained in this subpart.
(3) ELTs verified in accordance with § 87.147(e).
(4) Signal generators when used as radionavigation land test stations (MTF).
(d) Aircraft earth stations must correct their transmit frequencies for Doppler effect relative to the satellite. The transmitted signal may not deviate more than 335 Hz from the desired transmit frequency. (This is a root sum square error which assumes zero error for the received ground earth station signal and includes the AES transmit/receive frequency reference error and the AES automatic frequency control residual errors.) The applicant must attest that the equipment provides adequate Doppler effect compensation and where applicable, that measurements have been made that demonstrate compliance. Submission of data demonstrating compliance is not required unless requested by the Commission.
(a) Certification may be requested by following the procedures in part 2 of this chapter. Aircraft transmitters must meet the requirements over an ambient temperature range of −20 degrees to + 50 degrees Celsius.
(b) ELTs manufactured after October 1, 1988, must meet the output power characteristics contained in § 87.141(i). A report of the measurements must be submitted with each application for certification. ELTs that meet the output power characteristics of the section must have a permanent label prominently displayed on the outer casing state, “Meets FCC Rule for improved satellite detection.” This label, however, must not be placed on the equipment without authorization to do so by the Commission. Application for such authorization may be made either by submission of a new application for certification accompanied by the required fee and all information and test data required by parts 2 and 87 of this chapter or, for ELTs approved prior to October 1, 1988, a letter requesting such authorization, including appropriate test data and a showing that all units produced under the original equipment authorization comply with the requirements of this paragraph without change to the original circuitry.
(c) An applicant for a station license may request certification for an individual transmitter by following the procedure in part 2 of this chapter. Such a transmitter will be individually certified and so noted on the station license.
(d) An applicant for certification of equipment intended for transmission in any of the frequency bands listed in paragraph (d)(3) of this section must notify the FAA of the filing of a certification application. The letter of notification must be mailed to: FAA, Office of Spectrum Policy and Management, ASR-1, 800 Independence Ave., SW., Washington, DC 20591 prior to the filing of the application with the Commission.
(1) The notification must describe the equipment, give the manufacturer's identification, antenna characteristics, rated output power, emission type and characteristics, the frequency or frequencies of operation, and essential receiver characteristics if protection is required.
(2) The certification application must include a copy of the notification letter to the FAA. The Commission will not act until it receives the FAA's determination regarding whether it objects to the application for equipment authorization. The FAA should mail its determination to: Office of Engineering and Technology Laboratory, Authorization and Evaluation Division, 7435 Oakland Mills Rd., Columbia, MD 21046. The Commission will consider the FAA determination before taking final action on the application.
(3) The frequency bands are as follows:
90-110 kHz
190-285 kHz
325-435 kHz
74.800 MHz to 75.200 MHz
108.000 MHz to 137.000 MHz
328.600 MHz to 335.400 MHz
960.000 MHz to 1215.000 MHz
1545.000 MHz to 1626.500 MHz
1646.500 MHz to 1660.500 MHz
5000.000 MHz to 5250.000 MHz
14.000 GHz to 14.400 GHz
15.400 GHz to 15.700 GHz
24.250 GHz to 25.250 GHz
31.800 GHz to 33.400 GHz
(e) Supplier's Declaration of Conformity for ELTs capable of operating on the frequency 406.0-406.1 MHz must include sufficient documentation to show that the ELT meets the requirements of § 87.199(a). A letter notifying the FAA of the ELT Supplier's Declaration of Conformity must be mailed to: FAA, Office of Spectrum Policy and Management, ASR-1, 800 Independence Avenue SW., Washington, DC 20591.
Note 1 to paragraph ( e ):
The verification procedure has been replaced by Supplier's Declaration of Conformity. Equipment previously authorized under subpart J of part 2 of this chapter may remain in use. See § 2.950 of this chapter.
(f) Certification may be requested for equipment that has the capability to transmit in the 138-144 MHz, 148-149.9 MHz, or 150.5-150.8 MHz bands as well as frequency bands set forth in § 87.173. The Commission will only certify this equipment for use in the bands regulated by this part.
Brief signalling for the purposes of measuring the quality of a radio channel and thereafter establishing communication shall be permitted within the 2 MHz-30 MHz band. Public coast stations licensed under part 80 of this chapter providing high seas service are authorized by rule to use such signalling under the following conditions:
(a) The transmitter power shall not exceed 100 W ERP;
(b) Transmissions must sweep linearly in frequency at a rate of at least 60 kHz per second, occupying any 3 kHz bandwidth for less than 50 milliseconds;
(c) The transmitter shall scan the band no more than four times per hour;
(d) Transmissions within 6 kHz of the following protected frequencies and frequency bands must not exceed 10 µW peak ERP:
(1) Protected frequencies (kHz)
2091.0
4188.0
6312.0
12290.0
16420.0
2174.5
4207.5
8257.0
12392.0
16522.0
2182.0
5000.0
8291.0
12520.0
16695.0
2187.5
5167.5
8357.5
12563.0
16750.0
2500.0
5680.0
8364.0
12577.0
16804.5
3023.0
6215.0
8375.0
15000.0
20000.0
4000.0
6268.0
8414.5
16000.0
25000.0
4177.5
6282.0
10000.0
(2) Protected bands (kHz)
4125.0-4128.0
8376.25-8386.75
13360.0-13410.0
25500.0-25670.0
(e) The instantaneous signal, which refers to the peak power that would be measured with the frequency sweep stopped, along with spurious emissions generated from the sweeping signal, must be attenuated below the peak carrier power (in watts) as follows:
(1) On any frequency more than 5 Hz from the instantaneous carrier frequency, at least 3 dB;
(2) On any frequency more than 250 Hz from the instantaneous carrier frequency, at least 40 dB; and
(3) On any frequency more than 7.5 kHz from the instantaneous carrier frequency, at least 43 + 10log 10 (peak power in watts) db.
(a) The receiver shall achieve a message failure rate less than or equal to one failed message per 1000 full-length (222 bytes) application data messages, while operating over a range from −87 dBm to −1 dBm, provided that the variation in the average received signal power between successive bursts in a given time slot shall not exceed 40 dB. Failed messages include those lost by the VHF data receiver system or which do not pass the cyclic redundancy check (CRC) after application of the forward error correction (FEC).
(b) The aircraft receiving antenna can be horizontally or vertically polarized. Due to the difference in the signal strength of horizontally and vertically polarized components of the broadcast signal, the total aircraft implementation loss is limited to 15 dB for horizontally polarized receiving antennas and 11 dB for vertically polarized receiving antennas.
(c) Desensitization. The receiver shall meet the requirements specified in paragraph (a) of this section in the presence of VHF-FM broadcast signals in accord with following tables.
(1) Maximum levels of undesired signals.
Frequency 1
Maximum level of undesired signal at the receiver input (dBm)
50 kHz up to 88 MHz
−13
88 MHz-107.900 MHz
[see paragraph (c)(2)]
108.000 MHz-117.975 MHz
excluded
118MHz
−44
118.025 MHz
−41
118.050 MHz up to 1660.5 MHz
−13
1 The relationship is linear between single adjacent points designated by the above frequencies.
(2) Desensitization frequency and power requirements for the frequencies 108.025 MHz to 111.975 MHz.
Frequency 1
Maximum level of undesired signal at the receiver input (dBm)
88 MHz ≤f ≤102 MHz
15
104 MHz
10
106 MHz
5
107.9 MHz
−10
1 The relationship is linear between single adjacent points designated by the above frequencies.
(3) Desensitization frequency and power requirements for the frequencies 112.00 MHz to 117.975 MHz.
Frequency 1
Maximum level of undesired signal at the receiver input (dBm)
88 MHz ≤f ≤104 MHz
15
106 MHz
10
107 MHz
5
107.9 MHz
0
1 The relationship is linear between single adjacent points designated by the above frequencies.
(d) Intermodulation immunity. The receiver shall meet the requirements specified in paragraph (a) of this section in the presence of interference from two-signal, third order intermodulation products of two VHF-FM broadcast signals having levels in accordance with the following:
(1) 2N 1 + N 2 + 72 ≤0 for VHF-FM sound broadcasting signals in the range 107.7-108 MHz; and
(2) 2N 1 + N 2 + 3 (24 −20log delta f /0.4) ≤0 for VHF-FM sound broadcasting signals below 107.7 MHz, where the frequencies of the two VHF-FM sound broadcasting signals produce, within the receiver, a two signal, third-order intermodulation product on the desired VDB frequency.
(3) In the formulas in paragraphs (d)(1) and (d)(2) of this section, N 1 and N 2 are the levels (dBm) of the two VHF FM sound broadcasting signals at the VHF data broadcast (VDB) receiver input. Neither level shall exceed the desensitization criteria set forth in paragraph (c) of this section. Delta f = 108.1 − f 1 , where f 1 is the frequency of N 1 , the VHF FM sound broadcasting signal closer to 108.1 MHz.
This subpart contains class of station symbols and a frequency table which lists assignable frequencies. Frequencies in the Aviation Services will transmit communications for the safe, expeditious, and economic operation of aircraft and the protection of life and property in the air. Each class of land station may communicate in accordance with the particular sections of this part which govern these classes. Land stations in the Aviation Services in Alaska may transmit messages concerning sickness, death, weather, ice conditions or other matters relating to safety of life and property if there is no other established means of communications between the points in question and no charge is made for the communications service.
The two or three letter symbols for the classes of station in the aviation services are:
Symbol and class of station
AX—Aeronautical fixed
AVW—Audio visual warning systems
AXO—Aeronautical operational fixed
DGP—Differential GPS
DLT—Aircraft data link land test
FA—Aeronautical land (unspecified)
FAC—Airport control tower
FAE—Aeronautical enroute
FAM—Aeronautical multicom
FAR—Aeronautical search and rescue
FAS—Aviation support
FAT—Flight test
FAU—Aeronautical advisory (unicom)
FAW—Automatic weather observation
GCO—Ground Communication Outlet
MA—Aircraft (Air carrier and Private)
MA1—Air carrier aircraft only
MA2—Private aircraft only
MOU—Aeronautical utility mobile
MRT—ELT test
RCO—Remote Communications Outlet
RL—Radionavigation land (unspecified)
RLA—Marker beacon
RLB—Radiobeacon
RLD—RADAR/TEST
RLG—Glide path
RLL—Localizer
RLO—VHF omni-range
RLS—Surveillance radar
RLT—Radionavigation land test
RLW—Microwave landing system
RNV—Radio Navigation Land/DME
RPC—Ramp Control
TJ—Aircraft earth station in the Aeronautical Mobile-Satellite Service
UAT—Universal Access Transceiver
(a) The table in paragraph (b) of this section lists assignable carrier frequencies or frequency bands.
(1) The single letter symbol appearing in the “Subpart” column indicates the subpart of this part which contains additional applicable regulations.
(2) The two or three letter symbol appearing in the “Class of Station” column indicates the class of station to which the frequency is assignable.
(b) Frequency table:
Frequency or frequency band
Subpart
Class of station
Remarks
90-110 kHz
Q
RL
LORAN “C”.
190-285 kHz
Q
RLB
Radiobeacons.
200-285 kHz
O
FAC
Air traffic control.
325-405 kHz
O
FAC
Air traffic control.
325-435 kHz
Q
RLB
Radiobeacons.
410.0 kHz
F
MA
International direction-finding for use outside of United States.
457.0 kHz
F
MA
Working frequency for aircraft on over-water flights.
500.0 kHz
F
MA
International calling and distress frequency for ships and aircraft on over-water flights.
510-535 kHz
Q
RLB
Radiobeacons.
2182.0 kHz
F
MA
International distress and calling.
2648.0 kHz
I
AX
Alaska station.
2850.0-3025.0 kHz
I
MA, FAE
International HF.
2851.0 kHz
I, J
MA, FAE, FAT
International HF; Flight Test.
2866.0 kHz
I
MA, FAE
Domestic HF; (Alaska).
2875.0 kHz
I
MA, FAE
Domestic HF.
2878.0 kHz
I
MA1, FAE
Domestic HF; International HF.
2911.0 kHz
I
MA, FAE
Domestic HF.
2956.0 kHz
I
MA, FAE
Domestic HF.
3004.0 kHz
I, J
MA, FAE, FAT
International HF; Flight Test.
3019.0 kHz
I
MA1, FAE
Domestic HF; International HF.
3023.0 kHz
F, M, O
MA1, FAR, FAC
Search and rescue communications.
3281.0 kHz
K
MA, FAS
Lighter-than-air craft and aeronautical stations serving lighter-than-air craft.
3400.0-3500.0 kHz
I
MA, FAE
International HF.
3434.0 kHz
I
MA1, FAE
Domestic HF.
3443.0 kHz
J
MA, FAT
Flight Test.
3449.0 kHz
I
MA, FAE
Domestic HF.
3470.0 kHz
I
MA, FAE
Domestic HF; International HF.
4125.0 kHz
F
MA
Distress and safety with ships and coast stations.
4550.0 kHz
I
AX
Gulf of Mexico.
4645.0 kHz
I
AX
Alaska.
4650.0-4700.0 kHz
I
MA, FAE
International HF.
4672.0 kHz
I
MA1, FAE
Domestic HF.
4947.5 kHz
I
AX
Alaska.
5036.0 kHz
I
AX
Gulf of Mexico.
5122.5 kHz
I
AX
Alaska.
5167.5 kHz
I
FA
Alaska emergency.
5310.0 kHz
I
AX
Alaska.
5450.0-5680.0 kHz
I
MA, FAE
International HF.
5451.0 kHz
J
MA, FAT
Flight Test.
5463.0 kHz
I
MA1, FAE
Domestic HF.
5469.0 kHz
J
MA, FAT
Flight Test.
5472.0 kHz
I
MA, FAE
Domestic HF.
5484.0 kHz
I
MA, FAE
Domestic HF.
5490.0 kHz
I
MA, FAE
Domestic HF.
5496.0 kHz
I
MA, FAE
Domestic HF.
5508.0 kHz
I
MA1, FAE
Domestic HF.
5571.0 kHz
J
MA, FAT
Flight Test.
5631.0 kHz
I
MA, FAE
Domestic HF.
5680.0 kHz
F, M, O
MA1, FAC, FAR
Search and rescue communications.
5887.5 kHz
I
AX
Alaska.
6525.0-6685.0 kHz
I
MA, FAE
International HF.
6550.0 kHz
J
MA, FAT
Flight Test.
6580.0 kHz
I
MA, FAE
Domestic HF.
6604.0 kHz
I
MA, FAE
Domestic HF.
8015.0 kHz
I
AX
Alaska.
8364.0 kHz
F
MA
Search and rescue communications.
8815.0-8965.0 kHz
I
MA, FAE
International HF.
8822.0 kHz
J
MA, FAT
Flight Test.
8855.0 kHz
I
MA, FAE
Domestic HF; international HF.
8876.0 kHz
I
MA, FAE
Domestic HF.
10005.0-10100.0 kHz
I
MA, FAE
International HF.
10045.0 kHz
J
MA, FAT
Flight Test.
10066.0 kHz
I
MA, FAE
Domestic HF; international HF.
11275.0-11400.0 kHz
I
MA, FAE
International HF.
11288.0 kHz
J
MA, FAT
Flight Test.
11306.0 kHz
J
MA, FAT
Flight Test.
11357.0 kHz
I
MA, FAE
Domestic HF.
11363.0 kHz
I
MA, FAE
Domestic HF.
13260.0-13360.0 kHz
I
MA, FAE
International HF.
13312.0 kHz
I, J
MA, FAE, FAT
International HF; Flight Test.
17900.0-17970.0 kHz
I
MA, FAE
International HF.
17964.0 kHz
J
MA, FAT
Flight Test.
21924.0-22000.0 kHz
I
MA, FAE
International HF.
21931.0 kHz
J
MA, FAT
Flight Test.
72.02-72.98 MHz
P
FA, AXO
Operational fixed.
75.000 MHz
Q
RLA
Marker beacon.
75.42-75.98 MHz
P
FA, AXO
Operational fixed.
108.000 MHz
Q
RLT
108.000-117.950 MHz
Q
RLO
VHF omni-range.
108.000-117.975 MHz
Q
DGP
Differential GPS.
108.050 MHz
Q
RLT
108.100-111.950 MHz
Q
RLL
ILS Localizer.
108.100 MHz
Q
RLT
108.150 MHz
Q
RLT
118.000-121.400 MHz
O, S
MA, FAC, FAW, GCO RCO, RPC
25 kHz channel spacing
121.500 MHz
G, H, I, J, K, M, O
MA, FAU, FAE, FAT, FAS, FAC, FAM
Emergency and distress.
121.600-121.925 MHz
O, L, Q
MA, FAC, MOU, RLT, GCO, RCO, RPC
25 kHz channel spacing.
121.950 MHz
K
FAS
121.975 MHz
F, S
MA2, FAW, FAC, MOU
Air traffic control operations.
122.000 MHz
F
MA, FAC, MOU
Air carrier and private aircraft enroute flight advisory service provided by FAA.
122.025 MHz
F, S
MA2, FAW, FAC, MOU
Air traffic control operations.
122.050 MHz
F
MA, FAC, MOU
Air traffic control operations.
122.075 MHz
F, S
MA2, FAW, FAC, MOU
Air traffic control operations.
122.100 MHz
F, O
MA, FAC, MOU
Air traffic control operations.
122.125-122.675 MHz
F
MA2, FAC, MOU
Air traffic control operations; 25 kHz spacing.
122.700 MHz
G, L, Q
MA, FAU, MOU, AVW
Unicom at airports with no control tower; Aeronautical utility stations.
122.725 MHz
G, L, Q
MA, FAU, MOU, AVW
Unicom at airports with no control tower; Aeronautical utility stations.
122.750 MHz
F, Q
MA2, AVW
Private fixed wing aircraft air-to-air communications.
122.775 MHz
K
MA, FAS
122.800 MHz
G, L, Q
MA, FAU, MOU, AVW
Unicom at airports with no control tower; Aeronautical utility stations.
122.825 MHz
I
MA, FAE
Domestic VHF.
122.850 MHz
H, K, Q
MA, FAM, FAS, AVW.
122.875 MHz
I
MA, FAE
Domestic VHF.
122.900 MHz
F, H, L, M, Q
MA, FAR, FAM, MOU, AVW
122.925 MHz
H
MA2, FAM
122.950 MHz
G, L, Q
MA, FAU, MOU, AVW
Unicom at airports with control tower; Aeronautical utility stations.
122.975 MHz
G, L, Q
MA, FAU, MOU, AVW
Unicom at airports with no control tower; Aeronautical utility stations.
123.000 MHz
G, L, Q
MA, FAU, MOU, AVW
Unicom at airports with no control tower; Aeronautical utility stations.
123.025 MHz
F, Q
MA2, AVW
Helicopter air-to-air communications; Air traffic control operations.
123.050 MHz
G, L, Q
MA, FAU, MOU, AVW
Unicom at airports with no control tower; Aeronautical utility stations.
123.075 MHz
G, L, Q
MA, FAU, MOU, AVW
Unicom at airports with no control tower; Aeronautical utility stations.
123.100 MHz
M, O
MA, FAC, FAR
123.125 MHz
J
MA, FAT
Itinerant.
123.150 MHz
J
MA, FAT
Itinerant.
123.175 MHz
J
MA, FAT
Itinerant.
123.200 MHz
J
MA, FAT
123.225 MHz
J
MA, FAT
123.250 MHz
J
MA, FAT
123.275 MHz
J
MA, FAT
123.300 MHz
K, Q
MA, FAS, AVW.
123.325 MHz
J
MA, FAT
123.350 MHz
J
MA, FAT
123.375 MHz
J
MA, FAT
123.400 MHz
J
MA, FAT
Itinerant.
123.425 MHz
J
MA, FAT
123.450 MHz
J
MA, FAT
123.475 MHz
J
MA, FAT
123.500 MHz
K, Q
MA, FAS, AVW.
123.525 MHz
J
MA, FAT
123.550 MHz
J
MA, FAT
123.575 MHz
J
MA, FAT
123.6-128.8 MHz
O, S
MA, FAC, FAW, GCO, RCO, RPC
25 kHz channel spacing.
128.825-132.000 MHz
I
MA, FAE
Domestic VHF.
131.450 MHz
I
DLT.
131.550 MHz
I
DLT.
131.725 MHz
I
DLT.
131.825 MHz
I
DLT.
132.025-135.975 MHz
O, S
MA, FAC, FAW, GCO RCO RPC
25 kHz channel spacing.
136.000-136.400 MHz
O, S
MA, FAC, FAW, GCO, RCO, RPC
Air traffic control operations; 25 kHz channel spacing.
136.425 MHz
O, S
MA, FAC, FAW, GCO, RCO, RPC
Air traffic control operations.
136.450 MHz
O, S
MA, FAC, FAW, GCO, RCO, RPC
Air traffic control operations.
136.475 MHz
O, S
MA, FAC, FAW, GCO, RCO, RPC
Air traffic control operations.
136.500-136.875 MHz
I
MA, FAE
Domestic VHF; 25 kHz channel spacing.
136.850 MHz
I
DLT.
136.900 MHz
I
MA, FAE, DLT
International and Domestic VHF.
136.925 MHz
I
MA, FAE, DLT
International and Domestic VHF.
136.950 MHz
I
MA, FAE, DLT
International and Domestic VHF.
136.975 MHz
I
MA, FAE, DLT
International and Domestic VHF.
156.300 MHz
F
MA
For communications with ship stations under specific conditions.
156.375 MHz
F
MA
For communications with ship stations under specific conditions; Not authorized in New Orleans Vessel traffic service area.
156.400 MHz
F
MA
For communications with ship stations under specific conditions.
156.425 MHz
F
MA
For communications with ship stations under specific conditions.
156.450 MHz
F
MA
For communications with ship stations under specific conditions.
156.625 MHz
F
MA
For communications with ship stations under specific conditions.
156.800 MHz
F
MA
Distress, safety and calling frequency; For communications with ship stations under specific conditions.
156.900 MHz
F
MA
For communications with ship stations under specific conditions.
157.425 MHz
F
MA
For communications with commercial fishing vessels under specific conditions except in Great Lakes and St. Lawrence Seaway Areas.
243.000 MHz
F
MA
Emergency and distress frequency for use of survival craft and emergency locator transmitters.
328.600-335.400 MHz
Q
RLG
ILS glide path.
334.550 MHz
Q
RLT
334.700 MHz
Q
RLT
406.0-406.1 MHz
F, G, H, I, J, K, M, O
MA, FAU, FAE, FAT, FAS, FAC, FAM
Emergency and distress.
960-1215 MHz
F, Q
MA, RL, RNV
Electronic aids to air navigation.
978.000 MHz
F, L, Q
MA, MOU, UAT
Universal Access Transceivers.
UAT
Q
RLT
979.000 MHz
Q
RLT
1030.000 MHz
Q
RLT.
1090.000 MHz
L
MOU, RLT
Vehicle Squitter.
1104.000 MHz
Q
RLT
1300-1350 MHz
F, Q
MA, RLS
Surveillance radars and transponders.
1435-1525 MHz
F, J
MA, FAT
Aeronautical telemetry and telecommand operations.
1559-1610 MHz
Q
DGP
Differential GPS.
1559-1626.5 MHz
F, Q
MA, RL
Aeronautical radionavigation.
1646.5-1660.5 MHz
F
TJ
Aeronautical Mobile-Satellite (R).
2345-2395 MHz
J
MA, FAT
Aeronautical telemetry and telecommand operations.
2700-2900 MHz
Q
RLS, RLD
Airport surveillance and weather radar.
4200-4400 MHz
F
MA
Radio altimeters.
5030-5150 MHz
Q
MA, RLW
Microwave landing systems.
5031.000 MHz
Q
RLT
5091-5150 MHz
J
MA, FAT
Aeronautical telemetry.
5350-5470 MHz
F
MA
Airborne radars and associated airborne beacons.
8750-8850 MHz
F
MA
Airborne doppler radar.
9000-9200 MHz
Q
RLS, RLD
Land-based radar.
9300-9500 MHz
F, Q
MA
Airborne radars and associated airborne beacons.
13250-13400 MHz
F
MA
Airborne doppler radar.
15400-15700 MHz
Q
RL
Aeronautical radionavigation.
24450-24650 MHz
F, Q
MA, RL
Aeronautical radionavigation.
32300-33400 MHz
F, Q
MA, RL
Aeronautical radionavigation.
(a) Aircraft stations must limit their communications to the necessities of safe, efficient, and economic operation of aircraft and the protection of life and property in the air, except as otherwise specifically provided in this part. Contact with an aeronautical land station must only be attempted when the aircraft is within the serivce area of the land station. however, aircraft stations may transmit advisory information on air traffic control, unicom or aeronautical multicom frequencies for the benefit and use of other stations monitoring these frequencies in accordance with FAA recommended traffic advisory practices.
(b) Aircraft public correspondence service must be made available to all persons without discrimination and on reasonable demand, and must communicate without discrimination with any public coast station or mobile-satellite earth station authorized to provide aircraft public correspondence service.
(c) Aircraft public correspondence service on maritime mobile frequencies may only be carried by aircraft stations licensed to use maritime mobile frequencies and must follow the rules for public correspondence in part 80.
(d) Aircraft public correspondence service on Aeronautical Mobile-Satellite (R) Service frequencies may only be carried on aircraft earth stations licensed to use Aeronautical Mobile-Satellite (R) frequencies and are subject to the rules for public correspondence in this part. Aircraft public correspondence service on Maritime Mobile-Satellite Service frequencies may only be carried by aircraft earth stations licensed to use Maritime Mobile-Satellite frequencies and are subject to the rules for public correspondence in part 80.
(a) Frequencies used for air-ground Communications are listed in subpart E. Aircraft stations may use frequencies assigned to Government or non-Government aeronautical stations or radionavigation land stations if the communications are within the aeronautical or radionavigation land station scope of service.
(b) 410 kHz is the international direction-finding frequency for use outside the continental United States.
(c) 457 kHz is an authorized working frequency for flights over the high seas.
(d) 500 kHz an international calling and distress frequency for aircraft on flights over the high seas. Except for distress, urgency or safety messages an aircraft station must not transmit on 500 kHz during the silence periods for three minutes twice each hour beginning at x h. 15 and x h.45 Coordinated Universal Time (u.t.c.).
(e) The frequency 2182 khz is an international distress and calling frequency for use by ship, aircraft and survival craft stations. Aircraft stations must use J3E emission when operating on 2182 kHz and communicating with domestic public and private coast stations. The emission H3E may be used when communicating with foreign coast and ship stations.
(f) The frequencies 3023 kHz, 5680 kHz, 122.900 MHz and 123.100 MHz are authorized for use by aircraft engaged in seach and rescue activities in accordance with subpart M. These frequencies may be used for air-air and air-ground communications.
(g) The frequency 4125 kHz may be used for distress and safety communications between aircraft and ship and coast maritime mobile stations.
(h) The frequency 8364.0 kHz is authorized for use of survival craft for search and rescue communications with stations in the maritime mobile service.
(i) The frequencies in the band 121.975-122.675 MHz are authorized for use by private aircraft of air traffic control operations.
(1) The frequencies 122.00 and 122.050 MHz are authorized for use by air carrier and private aircraft stations for enroute flight advisory service (EFAS) provided by the FAA;
(2) The frequency 122.100 MHz is authorized for use by air carrier aircraft stations for air traffic control operations at locations in Alaska where other frequencies are not available for air traffic control.
(j) The frequency 122.750 MHz is authoried for use by private fixed wing aircraft for air-air communications. The frequency 123.025 MHz is authorized for use by helicopters for air-air Communications.
(k) The frequencies 121.500 MHz and 243.000 MHz are emergency and distress frequences available for use by survival craft stations, emergency locator transmitters and equipment used for survival pruposes. Use of 121.500 MHz and 243.00 MHz shall be limited to transmission of signals and communications for survival purposes. Type A2A, A3E or A3N emission may be employed, except in the case of emergency locator transmitters where A3E, A3X and NON are permitted.
(l) The frequencies 156.300, 156.375, 156,400, 156,425, 156.450, 156.625, 156.800 156.900 and 157.425 MHz may be used by aircraft stations to communicate with ship stations in accordance with part 80 and the following conditions:
(1) The altitude of aircraft stations must not exceed 300 meters (1,000 feet), except for reconnaissance aircraft participating in icebreaking operations where an altitude of 450 meters (1,500 feet) is allowed;
(2) Aircraft station transmitter power must not exceed five watts;
(3) The frequency 156.300 MHz may be used for safety purposes only. The frequency 156.800 MHz may be used for distress, safety and calling purposes only.
(4) Except in the Great Lakes and along the St. Lawrence Seaway the frequency 157.425 MHz is available for communications with commerical fishing vessels.
(5) The frequency 156.375 MHz cannot be used in the New Orleans, LA, VTS protection area. No harmful interference shall be caused to the VTS.
(m) The frequency 406.0-406.1 MHz is an emergency and distress frequency available for use by emergency locator transmitters. Use of this frequency must be limited to transmission of distress and safety communications.
(n) The frequency band 960-1215 MHz is for the use of airborne electronic aids to air navigation and directly associated land stations.
(o) The frequency band 1300-1350 MHz is for surveillance radar stations and associated airborne transponders.
(p) The 1435-1525 MHz and 2360-2395 MHz bands are available on a primary basis, and the 2345-2360 MHz band is available on a secondary basis (the latter band only until January 1, 2020), for telemetry and telecommand associated with the flight testing of aircraft, missiles, or related major components. This includes launching into space, reentry into the Earth's atmosphere and incidental orbiting prior to reentry. In the 1435-1525 MHz band, the following frequencies are shared on a co-equal basis with flight telemetering mobile stations: 1444.5, 1453.5, 1501.5, 1515.5, and 1524.5 MHz. In the 2360-2395 MHz band, the following frequencies may be assigned for telemetry and associated telecommand operations of expendable and re-usable launch vehicles, whether or not such operations involve flight testing: 2364.5, 2370.5 and 2382.5 MHz. See § 87.303(d).
Note to paragraph ( p ):
Aeronautical telemetry operations must protect Miscellaneous Wireless Communications Services operating in the 2345-2360 MHz band.
(q) The frequencies in the band 1545.000-1559.000 MHz and 1646.500-1660.500 MHz are authorized for use by the Aeronautical Mobile-Satellite (R) Service. The use of the bands 1544.000-1545.000 MHz (space-to-Earth) and 1645.500-1646.500 MHz (Earth-to-space) by the Mobile-Satellite Service is limited to distress and safety operations. In the frequency bands 1549.500-1558.500 MHz and 1651.000-1660.000 MHz, the Aeronautical Mobile-Satellite (R) requirements that cannot be accommodated in the 1545.000-1549.500 MHz, 1558.500-1559.000 MHz, 1646.500-1651.000 MHz, and 1660.000-1660.500 MHz bands shall have priority access with real-time preemptive capability for communications in the Mobile-Satellite Service. Systems not interoperable with the Aeronautical Mobile-Satellite (R) Service shall operate on a secondary basis. Account shall be taken of the priority of safety-related communications in the Mobile-Satellite Service.
(r) The frequency band 1559-1626.5 MHz is available for airborne electronic aids to air navigation and any associated land station.
(s) The frequency band 4200-4400 MHz is reserved exclusively for radio altimeters.
(t) The frequency band 5350-5470 MHz in the aeronautical radionavigation service is limited to airborne radars and associated airborne beacons.
(u) The frequency band 8750-8850 MHz is available for use by airborne doppler radars in the aeronautical radionavigation service only on the condition that they must accept any interference which may be experienced from stations in the radiolocation service in the band 8500-10,000 MHz.
(v) The frequency band 9300-9500 MHz is limited to airborne radars and associated airborne beacons.
(w) The frequency band 13250-13400 MHz available for airborne doppler radar use.
(x) The frequency bands 24450-24650 MHz and 32300-33400 MHz are available for airborne radionavigation devices.
(y) Brief keyed RF signals (keying the transmitter by momentarily depressing the microphone “push-to-talk” button) may be transmitted from aircraft for the control of automated unicoms on the unicom frequencies listed in paragraph (y)(3) of this section, or for the control of airport lights on the following frequencies:
(1) Any air traffic control frequency listed in § 87.421.
(2) FAA Flight Service Station frequencies 121.975-122.675 MHz.
(3) The unicom frequencies 122.700, 122.725, 122.800, 122.950, 122.975, 123.000, 123.050 and 123.075 MHz.
(4) Aviation support station frequencies listed in § 87.323(b): 121.950, 123.300 and 123.500 MHz if the frequency is assigned to a station at the airport and no harmful interference is caused to voice communications. If no such station is located at the concerned airport, aircraft may use one of the aviation support station frequencies for the control of airport lights.
(5) The frequency 122.9 MHz when it is used as the common traffic advisory frequency at the concerned airport.
(z) Frequencies for public correspondence between ships and public coast stations in the maritime mobile service (except frequencies in the 156-174 MHz band) and coast earth stations in the maritime mobile-satellite service are available for public correspondence between aircraft and public coast stations and coast earth stations, respectively. The transmission of public correspondence from aircraft must not cause interference to maritime communications.
(aa) Frequencies in the 454.675-459.975 MHz band are available in the Public Mobile Radio Service (part 22) for use on board aircraft for communications with land mobile stations which are interconnected to the nationwide public telephone system.
(bb) The frequencies 121.950 MHz, 122.850 MHz and 127.050
1
MHz are authorized for air-to-air use for aircraft up to and including 3 km (10,000 ft) mean sea level in the vicinity of Grand Canyon National Park in Arizona within the area bounded by the following coordinates (all coordinates are referenced to North American Datum 1983 (NAD83)):
1 Until further notice this frequency is available for air-to-air use as described in the Grand Canyon vicinity. Availability is a result of the FAA's assignment of this frequency. If the FAA reassigns this frequency the Commission may require air-to-air use to cease.
36-27-59.9 N. Lat; 112-47-2.7 W. Long.
36-27-59.9 N. Lat; 112-48-2.7 W. Long.
35-50-00.0 N. Lat; 112-48-2.7 W. Long.
35-43-00.0 N. Lat; 112-47-2.7 W. Long.
(cc) The frequency 120.650 MHz
1 is authorized for air-to-air use for aircraft up to and including 3 km (10,000 ft) mean sea level within the area bounded by the following coordinates (all coordinates are referenced to North American Datum 1983 (NAD83)):
35-59-44.9 N. Lat; 114-51-48.0 W. Long.
36-09-29.9 N. Lat; 114-50-3.0 W. Long.
36-09-29.9 N. Lat; 114-02-57.9 W. Long.
35-54-45.0 N. Lat; 113-48-47.8 W. Long.
(dd) The frequencies 136.425, 136.450, and 136.475 MHz are designated for flight information services—broadcast (FIS-B) and may not be used by aircraft for transmission.
(ee) The frequency 121.95 MHz is authorized for air-to-ground and air-to-air communications for aircraft up to 13000 feet above mean sea level (AMSL) within the area bounded by the following coordinates (all coordinates are referenced to North American Datum 1983 (NAD83)):
32-35-00 N. Lat.; 117-12-00 W. Long.
32-42-00 N. Lat.; 116-56-00 W. Long.
32-41-00 N. Lat.; 116-41-00 W. Long.
32-35-00 N. Lat.; 116-38-00 W. Long.
32-31-00 N. Lat.; 117-11-00 W. Long.
(ff) The frequency 978 MHz is authorized for Universal Access Transceiver data transmission.
(gg) (1) The frequency 120.650 MHz is authorized for air-to-air communications for aircraft over and within five nautical miles of the shoreline of the Hawaiian Island of Maui.
(2) The frequency 121.950 MHz is authorized for air-to-air use for aircraft over and within five nautical miles of the shoreline of the Hawaiian Island of Molokai.
(3) The frequency 122.850 MHz is authorized for air-to-air use for aircraft over and within five nautical miles of the shoreline of the Hawaiian Island of Oahu.
(4) The frequency 122.850 MHz is authorized for aircraft over and within five nautical miles of the shoreline of the Hawaiian Island of Hawaii when aircraft are south and east of the 215 degree radial of very high frequency omni-directional radio range of Hilo International Airport.
(5) The frequency 127.050 MHz is authorized for air-to-air use for aircraft over and within five nautical miles of the shoreline of the Hawaiian Island of Hawaii when aircraft are north and west of the 215 degree radial of very high frequency omni-directional radio range of Hilo International Airport.
(6) The frequency 127.050 MHz is authorized for air-to-air use for aircraft over and within five nautical miles of the Hawaiian Island of Kauai.
(hh) (1) The frequency 121.95 MHz is authorized for air-to-air communications for aircraft within the area bounded by the following coordinates (all coordinates are referenced to North American Datum 1983 (NAD83)):
33-46-00 N. Lat.; 118-27-00 W. Long.
33-47-00 N. Lat.; 118-12-00 W. Long.
33-40-00 N. Lat.; 118-00-00 W. Long.
33-35-00 N. Lat.; 118-08-00 W. Long.
34-00-00 N. Lat.; 118-26-00 W. Long.
(2) The frequency 122.775 MHz is authorized for air-to-air communications for aircraft within the area bounded by the following coordinates (all coordinates are referenced to North American Datum 1983 (NAD83)):
34-22-00 N. Lat.; 118-30-00 W. Long.
34-35-00 N. Lat.; 118-15-00 W. Long.
34-27-00 N. Lat.; 118-15-00 W. Long.
34-16-00 N. Lat.; 118-35-00 W. Long.
34-06-00 N. Lat.; 118-35-00 W. Long.
34-05-00 N. Lat.; 118-50-00 W. Long.
(3) The frequency 123.30 MHz is authorized for air-to-air communications for aircraft within the area bounded by the following coordinates (all coordinates are referenced to North American Datum 1983 (NAD83)):
34-08-00 N. Lat.; 118-00-00 W. Long.
34-10-00 N. Lat.; 117-08-00 W. Long.
34-00-00 N. Lat.; 117-08-00 W. Long.
33-53-00 N. Lat.; 117-42-00 W. Long.
33-58-00 N. Lat.; 118-00-00 W. Long.
(4) The frequency 123.50 MHz is authorized for air-to-air communications for aircraft within the area bounded by the following coordinates (all coordinates are referenced to North American Datum 1983 (NAD83)):
33-53-00 N. Lat.; 117-37-00 W. Long.
34-00-00 N. Lat.; 117-15-00 W. Long.
34-00-00 N. Lat.; 117-07-00 W. Long.
33-28-00 N. Lat.; 116-55-00 W. Long.
33-27-00 N. Lat.; 117-12-00 W. Long.
(5) The frequency 123.50 MHz is authorized for air-to-air communications for aircraft within the area bounded by the following coordinates (all coordinates are referenced to North American Datum 1983 (NAD83)):
33-50-00 N. Lat.; 117-48-00 W. Long.
33-51-00 N. Lat.; 117-41-00 W. Long.
33-38-00 N. Lat.; 117-30-00 W. Long.
33-30-00 N. Lat.; 117-30-00 W. Long.
33-30-00 N. Lat.; 117-49-00 W. Long.
(a) Transmitters used for public correspondence by aircraft stations in the maritime mobile frequency bands must be authorized by the Commission in conformity with part 80 of this chapter.
(b) Transmitters used for public correspondence by aircraft stations in the Aeronautical Mobile-Satellite (R) or Maritime Mobile-Satellite frequencies must be certificated by the Commission in conformity with part 87. Aircraft earth stations that are required to be commissioned to use a privately owned satellite system also must meet the provisions of § 87.51.
(c) A continuous watch must be maintained on the frequencies used for safety and regularity of flight while public correspondence communications are being handled. For aircraft earth stations, this requirement is satisfied by compliance with the priority and preemptive access requirements of § 87.187(q).
(d) All communications in the Aeronautical Mobile Service and the Aeronautical Mobile-Satellite (R) Service have priority over public correspondence.
(e) Transmission of public correspondence must be suspended when such operation will delay or interfere with message pertaining to safety of life and property or regularity of flight, or when ordered by the captain of the aircraft.
(a) Aircraft of member States of the International Civil Aviation Organization may carry and operate radio transmitters in the United States airspace only if a license has been issued by the State in which the aircraft is registered and the flight crew is provided with a radio operator license of the proper class, issued or recognized by the State in which the aircraft is registered. The use of radio transmitters in the United States airspace must comply with these rules and regulations.
(b) Notwithstanding paragraph (a) of this section where an agreement with a foreign government has been entered into with respect to aircraft registered in the United States but operated by an aircraft operator who is subject to regulation by that foreign government, the aircraft radio station license and aircraft radio operator license may be issued by such foreign government.
Transmissions by emergency locator transmitters (ELTs) are intended to be actuated manually or automatically and operated automatically as part of an aircraft or a survival craft station as a locating aid for survival purposes.
ELTs that operate only on frequency 121.5 MHz will no longer be certified. The manufacture, importation, and sale of ELTs that operate only on frequency 121.5 MHz is prohibited beginning July 10, 2019. Existing ELTs that operate only on frequency 121.5 MHz must be operated as certified.
ELT testing must avoid outside radiation. Bench and ground tests conducted outside of an RF-shielded enclosure must be conducted with the ELT terminated into a dummy load.
(a) 406.0-406.1 MHz ELTs use G1D emission. Except for the spurious emission limits specified in § 87.139(h), 406.0-406.1 MHz ELTs must meet all the technical and performance standards contained in the Radio Technical Commission for Aeronautics document titled “Minimum Operational Performance Standards 406 MHz Emergency Locator Transmitters (ELT)” Document No. RTCA/DO-204 dated September 29, 1989. Document No. RTCA/DO-204 is incorporated by reference into this the section with the approval of the Director of the Federal Register in accordance with 5 U.S.C 552(a) and 1 CFR part 51. This incorporation by reference (IBR) material is available for inspection at the FCC and at the National Archives and Records Administration (NARA). Contact the FCC through the Federal Communications Commission's Reference Information Center, phone: (202) 418-0270. For information on the availability of this material at NARA, visit www.archives.gov/federal-register/cfr/ibr-locations.html or email [email protected]. The material may be obtained from the Radio Technical Commission for Aeronautics (RTCA), Inc., 1150 18th Street NW, Suite 910, Washington, DC 20036; phone: (202) 833-9339; email: [email protected]; website: www.rtca.org.
(b) The 406.0-406.1 MHz ELT must contain as an integral part a homing beacon operating only on 121.500 MHz that meets all the requirements described in the RTCA Recommended Standards document described in paragraph (a) of this section. The 121.500 MHz homing beacon must have a continuous duty cycle that may be interrupted during the transmission of the 406.0-406.1 MHz signal only.
(c) As part of its Supplier's Declaration of Conformity a 406.0-406.1 MHz ELT, the ELT must be certified by a test facility recognized by one of the COSPAS/SARSAT Partners that the equipment satisfies the design characteristics associated with the COSPAS/SARSAT document COSPAS/SARSAT 406 MHz Distress Beacon Type Approval Standard (C/S T.007). Additionally, an independent test facility must certify that the ELT complies with the electrical and environmental standards associated with the RTCA Recommended Standards.
Note 1 to paragraph ( c ):
The verification procedure has been replaced by Supplier's Declaration of Conformity. Equipment previously authorized under subpart J of part 2 of this chapter may remain in use. See § 2.950 of this chapter.
(d) The procedures for Supplier's Declaration of Conformity are contained in subpart J of part 2 of this chapter.
(e) An identification code, issued by the National Oceanic and Atmospheric Administration (NOAA), the United States Program Manager for the 406.0-406.1 MHz COSPAS/SARSAT satellite system, must be programmed in each ELT unit to establish a unique identification for each ELT station. With each marketable ELT unit the manufacturer or grantee must include a postage pre-paid registration card printed with the ELT identification code addressed to: NOAA/SARSAT Beacon Registration, NSOF, E/SPO53, 1315 East West Hwy, Silver Spring, MD 20910-9684. The registration card must request the owner's name, address, telephone, type of aircraft, alternate emergency contact, and other information as required by NOAA. The registration card must also contain information regarding the availability to register the ELT at NOAA's online Web-based registration database at: http://www.beaconregistration.noaa.gov. Further, the following statement must be included: “WARNING—failure to register this ELT with NOAA before installation could result in a monetary forfeiture being issued to the owner.”
(f) To enhance protection of life and property, it is mandatory that each 406.0-406.1 MHz ELT must be registered with NOAA before installation and that information be kept up-to-date. In addition to the identification plate or label requirements contained in §§ 2.925 and 2.926 of this chapter, each 406.0-406.1 MHz ELT must be provided on the outside with a clearly discernable permanent plate or label containing the following statement: “The owner of this 406.0-406.1 MHz ELT must register the NOAA identification code contained on this label with the National Oceanic and Atmospheric Administration (NOAA), whose address is: NOAA/SARSAT Beacon Registration, NSOF, E/SPO53, 1315 East West Hwy, Silver Spring, MD 20910-9684.” Aircraft owners shall advise NOAA in writing upon change of aircraft or ELT ownership, or any other change in registration information. Fleet operators must notify NOAA upon transfer of ELT to another aircraft outside of the owner's control, or any other change in registration information. NOAA will provide registrants with proof of registration and change of registration postcards.
(g) For 406.0-406.1 MHz ELTs whose identification code can be changed after manufacture, the identification code shown on the plant or label must be easily replaceable using commonly available tools.
(a) An aeronautical advisory station (unicom) must provide service to any aircraft station upon request and without discrimination. A unicom must provide impartial information concerning available ground services.
(b)(1) Unicom transmissions must be limited to the necessities of safe and expeditious operation of aircraft such as condition of runways, types of fuel available, wind conditions, weather information, dispatching, or other necessary information. At any airport at which a control tower, control tower remote communications outlet station (RCO) or FAA flight service station is located, unicoms must not transmit information pertaining to the conditions of runways, wind conditions, or weather information during the hours of operation of the control tower, RCO or FAA service station.
(2) On a secondary basis, unicoms may transmit communications which pertain to the efficient portal-to-portal transit of an aircraft, such as requests for ground transportation, food or lodging.
(3) Communications between unicoms and air carrier must be limited to the necessities of safety of life and property.
(4) Unicoms may communicate with aeronautical utility stations and ground vehicles concerning runway conditions and safety hazards on the airport when neither a control tower nor FAA flight service station is in operation.
(c) Unicoms must not be used for air traffic control (ATC) purposes other than to relay ATC information between the pilot and air traffic controller. Relaying of ATC information is limited to the following:
(1) Revisions of proposed departure time;
(2) Takeoff, arrival or flight plan cancellation time;
(3) ATC clearances, provided a letter of agreement is obtained from the FAA by the licensee of the unicom.
(a) A unicom and any associated dispatch or control points must be located on the airport to be served.
(b) Only one unicom will be authorized to operate at an airport which does not have a control tower, RCO or FAA flight service station that operates on the published common traffic advisory frequency. At any other airport, the one unicom limitation does not apply, and the airport operator and all aviation services organizations may be licensed to operate a unicom on the assigned frequency.
(c) At an airport where only one unicom may be licensed, eligibility for new unicom licenses is restricted to State or local government entities, and to nongovernmental organizations (NGOs) that are authorized to apply for the license by a State or local government entity whose primary mission is the provision of public safety services. All applications submitted by NGOs must be accompanied by a new, written certification of support (for the NGO applicant to operate the applied for station) by the state or local government entity. Applications for a unicom license at the same airport, where only one unicom may be licensed, that are filed by two or more applicants meeting these eligibility criteria must be resolved through settlement or technical amendment.
(d) At an airport where only one unicom may be licensed, the license may be assigned or transferred only to an entity meeting the requirements of paragraph (c) of this section.
(e) An applicant for renewal of a unicom license shall be granted a presumptive renewal expectancy regardless of whether the applicant is eligible for a new unicom license under paragraph (c) of this section. Unless the renewal expectancy is defeated, applications that are mutually exclusive with the renewal application will not be accepted. The renewal expectancy may be defeated only upon a determination, following a hearing duly designated on the basis of a petition to deny or on the Commission's own motion, that the renewal applicant has not provided substantial service. For purposes of this paragraph, substantial service means service which is sound, favorable, and substantially above a level of mediocre service during the applicant's past license term. If the renewal expectancy is defeated, the renewal application will be dismissed unless the renewal applicant is eligible for a new unicom license pursuant to paragraph (c) of this section.
(f) At an airport where only one unicom may be licensed, when the Commission believes that the unicom has been abandoned or has ceased operation, another unicom may be licensed on an interim basis pending final determination of the status of the original unicom. An applicant for an interim license must notify the present licensee and must comply with the notice requirements of paragraph (g) of this section.
(g) An applicant for a unicom license, renewal or modification of frequency assignment at an airport which does not have a control tower, RCO or FAA flight service station must notify in writing the owner of the airport and all aviation service organizations located at the airport. The notice must include the applicant's name and address, the name of the airport and a statement that the applicant intends to file an application with the Commission for a unicom. The notice must be given within the ten days preceding the filing of the application with the Commission. Each applicant must certify upon application that either notice has been given and include the date of notification, or notice is not required because the applicant owns the airport and there are no organizations that should be notified.
(a) Only one unicom frequency will be assigned at any one airport. Applicants must request a particular frequency, which will be taken into consideration when the assignment is made. The frequencies assignable to unicoms are:
(1) 122.950 MHz at airports which have a full-time control tower or full-time FAA flight service station.
(2) 122.700, 122.725, 122.800, 122.975, 123.000, 123.050 or 123.075 MHz at all other airports.
(b) 121.500 MHz: emergency and distress only.
AVIATION SERVICES (U.S.C.). Retrieved via LawPlayer, https://lawplayer.com/us/act/cfr-title-47-part-87
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