reg 6 Risk assessments
(1) Subject to paragraph (2), the operator must ensure that a suitable and sufficient assessment of the magnitude of the risk to crew members from exposure to cosmic radiation in the course of performing their duties aboard the aircraft ... (a “risk assessment”) is conducted before undertaking aircraft ... operations. (2) Where an operator has completed a risk assessment (the “previous risk assessment”) in relation to an operation of aircraft ..., no further risk assessment needs to be conducted in relation to that operation, but a further risk assessment must be conducted if— (a) the operator has reason to suspect that the previous risk assessment is no longer valid; (b) there has been a significant change to the matters to which the previous risk assessment relates; or (c) the operator has reasonable cause to believe that a crew member has received an overexposure while performing duties for the operator on board that aircraft .... (3) The operator must take into account the results of the most recent risk assessments it has conducted in relation to an operation of aircraft ... when managing the operation of aircraft ..., with a view to minimising as far as reasonably possible the exposure of crew members to cosmic radiation. (4) Nothing in this article affects the obligations of an operator under regulation 3 of the Management of Health and Safety at Work Regulations 1999 (risk assessment) .