Sch 10 para 31
The organisation must have procedures to guarantee conformity with the essential requirements for interoperability, including updates throughout the lifecycle, by— (a) ensuring compliance with the specifications related to the basic parameters for interoperability as set out in the relevant NTSNs ; (b) verifying in all circumstances the consistency of the maintenance file with the authorisation of placing-in-service, including the requirements of a safety authority or the safety authority for the tunnel system, the declarations of conformity to NTSNs , the declarations of verification, and the technical file; (c) managing any substitution in the course of maintenance in compliance with the requirements of the relevant NTSNs ; (d) identifying the need for risk assessment regarding the potential impact of the substitution in question on the safety of the railway system; (e) managing the configuration of all technical changes affecting the system integrity of the vehicle.