---
kind: "section"
citation: "14 C.F.R. § 91.819"
title: "14"
number: "91.819"
heading: "Civil supersonic airplanes that do not comply with part 36."
url: "https://uscodex.org/cfr/14/91.819"
---

# §91.819. Civil supersonic airplanes that do not comply with part 36.

- (a) **Applicability.** This section applies to civil supersonic airplanes that have not been shown to comply with the Stage 2 noise limits of [part 36](/cfr/14/part36.md) in effect on October 13, 1977, using applicable trade-off provisions, and that are operated in the United States, after July 31, 1978.
- (b) **Airport use.** Except in an emergency, the following apply to each person who operates a civil supersonic airplane to or from an airport in the United States:
  - (1) Regardless of whether a type design change approval is applied for under [part 21](/cfr/14/part21.md) of this chapter, no person may land or take off an airplane covered by this section for which the type design is changed, after July 31, 1978, in a manner constituting an “acoustical change” under [§ 21.93](/cfr/14/21.93.md) unless the acoustical change requirements of [part 36](/cfr/14/part36.md) are complied with.
  - (2) No flight may be scheduled, or otherwise planned, for takeoff or landing after 10 p.m. and before 7 a.m. local time.

## Notes

### Source

Source: Docket 18334, 54 FR 34321, Aug. 18, 1989, unless otherwise noted.

### Authority

Authority: 49 U.S.C. 106(f), 40101, 40103, 40105, 40113, 40120, 44101, 44111, 44701, 44704, 44709, 44711, 44712, 44715,44716, 44717, 44722, 44740, 46306, 46315, 46316, 46504, 46506-46507, 47122, 47508,47528-47531, 47534; Pub. L. 112-95, 126 Stat. 11; Pub. L. 114-190, 130 Stat. 615 (49 U.S.C. 44703 note); sec. 828, Pub. L. 118-63, 138 Stat. 1330 (49 U.S.C. 44703 note); articles 12 and 29 of the Convention on International Civil Aviation, 61 Stat. 1180.