Products covered
Part 33 of Title 14 of the Code of Federal Regulations prescribes airworthiness standards for the issue of type certificates and changes to those certificates for aircraft engines.

Who must comply
Each applicant must show that the aircraft engine concerned meets the applicable requirements of this part (Sec. 33.3). Each person who applies under part 21 for such a certificate or change must show compliance with the applicable requirements of this part, the applicable fuel venting and exhaust emissions requirements of 14 CFR part 34, and the noise standards of 14 CFR part 36.

Identification marking requirements for aircraft engines
The identification and marking requirements for aircraft engines are presented in part 45, section 45.11(a), and section 45.13. For additional guidance, see page 23 of AC 33-2B, "Aircraft Engine Type Certification Handbook" (6/30/1993).