(b) Section 21.101(a) of this chapter notwithstanding, each person who applies for an acoustical change to a type design specified in §21.93(b) of this chapter must show compliance with the applicable requirements of this part that are effective on the date of application for the change in type design. When the time interval between the date of application for the change in type design and the issuance of the amended or supplemental type certificate exceeds 5 years, the applicant must show that the aircraft meets the applicable requirements of this part that were effective on a date, to be selected by the applicant, not earlier than 5 years before the issue of the amended or supplemental type certificate.
(c) If an applicant elects to comply with a standard in this part that was effective after the filing of the application for a type certificate or change to a type design, the election:
(1) Must be approved by the FAA;
(2) Must include standards adopted between the date of application and the date of the election;
(3) May include other standards adopted after the standard elected by the applicant as determined by the FAA.
[Amdt. 36–54, 67 FR 45211, July 8, 2002; Amdt. 36–24, 67 FR 63195, Oct. 10, 2002]