14 CFR § 21.115

Each applicant for a supplemental type certificate must show that the altered product meets applicable requirements specified in § 21.101 and—

In the case of an acoustical change described in § 21.93(b), show compliance with the applicable noise requirements of part 36 of this chapter;

In the case of an emissions change described in § 21.93(c), show compliance with the applicable fuel venting and exhaust emissions requirements of part 34 of this chapter; and

In the case of a fuel efficiency change described in § 21.93(d), show compliance with the applicable fuel efficiency requirements of part 38 of this chapter.

Each applicant for a supplemental type certificate must meet §§ 21.33 and 21.53 with respect to each change in the type design.