ZFT
There is a requirement on an initial EASA evaluation for the operator’s evaluation team to sign and submit an attestation to EASA that confirms that, amongst other items the FFS flying qualities represents theaeroplane being simulated (GM1 ORA.FSTD.115 Part C).
FAA Part 60 has the same requirement:
§60.15 Initial qualification requirements.
(b) The management representative described in §60.9(c) must sign a statement (electronic signature is acceptable for electronic transmissions) after confirming the following:
(1) The performance and handling qualities of the FSTD represent those of the aircraft or set of aircraft within the normal operating envelope. This determination must be made by a pilot(s) meeting the requirements of paragraph (d) of this section after having flown all of the Operations Tasks listed in the applicable QPS appendix relevant to the qualification level of the FSTD. Exceptions, if any, must be noted. The name of the person(s) making this determination must be available to the NSPM upon request.