---
kind: "section"
citation: "14 C.F.R. § 91.817"
title: "14"
number: "91.817"
heading: "Civil aircraft sonic boom."
url: "https://uscodex.org/cfr/14/91.817"
---

# §91.817. Civil aircraft sonic boom.

- (a) No person may operate a civil aircraft in the United States at a true flight Mach number greater than 1 except in compliance with conditions and limitations in an authorization to exceed Mach 1 issued to the operator in accordance with [§ 91.818](/cfr/14/91.818.md).
- (b) In addition, no person may operate a civil aircraft for which the maximum operating limit speed MM0 exceeds a Mach number of 1, to or from an airport in the United States, unless—
  - (1) Information available to the flight crew includes flight limitations that ensure that flights entering or leaving the United States will not cause a sonic boom to reach the surface within the United States; and
  - (2) The operator complies with the flight limitations prescribed in [paragraph (b)(1)](#b-1) of this section or complies with conditions and limitations in an authorization to exceed Mach 1 issued in accordance with [§ 91.818](/cfr/14/91.818.md).

## Notes

### Amendments

[Docket 18334, 54 FR 34321, Aug. 18, 1989, as amended by Amdt. 91-362, 86 FR 3792, Jan. 15, 2021]

### 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.

### Amendments

[Docket 18334, 54 FR 34321, Aug. 18, 1989, as amended by Amdt. 91-362, 86 FR 3792, Jan. 15, 2021]