For these Regulations:
(a) the incidental provisions of Part 25 of the FARs, as in force from time to time, apply to the operation of the airworthiness standards in that Part, with the changes provided under this Part; and
(b) the incidental provisions of EASA CS - 25, as in force from time to time, apply to the operation of the airworthiness standards in that instrument, with the changes provided under this Part.
Subpart 25.B -- Changes to FARs and EASA CS - 25