---
kind: "section"
citation: "14 C.F.R. § 437.59"
title: "14"
number: "437.59"
heading: "Key flight-safety event limitations."
url: "https://uscodex.org/cfr/14/437.59"
---

# §437.59. Key flight-safety event limitations.

- (a) A permittee must conduct any key flight-safety event so that the reusable suborbital vehicle's instantaneous impact point, including its expected dispersion, is over an unpopulated or sparsely populated area. At a minimum, a key flight-safety event includes:
  - (1) Ignition of any primary rocket engine,
  - (2) Any staging event, or
  - (3) **Any envelope expansion.**
- (b) A permittee must conduct each reusable suborbital vehicle flight so that the reentry impact point does not loiter over a populated area.

## Notes

### Amendments

[Doc. No. FAA-2006-24197, Amdt. No. 437-0, 72 FR 17019, Apr. 6, 2007, as amended by Doc. No. FAA-2023-1656, Amdt. No. 437-4, 89 FR 76727, Sept. 19, 2024]

### Authority

Authority: 51 U.S.C. 50901-50923.

### Source

Source: Docket No. FAA-2006-24197, 72 FR 17019, Apr. 6, 2007, unless otherwise noted.

### Amendments

[Doc. No. FAA-2006-24197, Amdt. No. 437-0, 72 FR 17019, Apr. 6, 2007, as amended by Doc. No. FAA-2023-1656, Amdt. No. 437-4, 89 FR 76727, Sept. 19, 2024]