14 CFR 33.3 : Aeronautics And Space (§ 1.1 To Parts 1311-1399) — (§ 1.1 To Parts 50-59) — Federal Aviation Administration, Department Of Transportation (§ 1.1 To Parts 50-59) — Aircraft (§ 21.1 To Parts 50-59) — Airworthiness Standards: Aircraft Engines (§ 33.1 To Appendix D To Part 33) — General (§ 33.1 To § 33.8) — General.