---
kind: "section"
citation: "14 C.F.R. § 29.729"
title: "14"
number: "29.729"
heading: "Retracting mechanism."
url: "https://uscodex.org/cfr/14/29.729"
---

# §29.729. Retracting mechanism.


For rotorcraft with retractable landing gear, the following apply:

- (a) **Loads.** The landing gear, retracting mechanism, wheel well doors, and supporting structure must be designed for—
  - (1) The loads occurring in any maneuvering condition with the gear retracted;
  - (2) The combined friction, inertia, and air loads occurring during retraction and extension at any airspeed up to the design maximum landing gear operating speed; and
  - (3) The flight loads, including those in yawed flight, occurring with the gear extended at any airspeed up to the design maximum landing gear extended speed.
- (b) **Landing gear lock.** A positive means must be provided to keep the gear extended.
- (c) **Emergency operation.** When other than manual power is used to operate the gear, emergency means must be provided for extending the gear in the event of—
  - (1) Any reasonably probable failure in the normal retraction system; or
  - (2) **The failure of any single source of hydraulic, electric, or equivalent energy.**
- (d) **Operation tests.** The proper functioning of the retracting mechanism must be shown by operation tests.
- (e) **Position indicator.** There must be means to indicate to the pilot when the gear is secured in the extreme positions.
- (f) **Control.** The location and operation of the retraction control must meet the requirements of §§ [29.777](/cfr/14/29.777.md) and [29.779](/cfr/14/29.779.md).
- (g) **Landing gear warning.** An aural or equally effective landing gear warning device must be provided that functions continuously when the rotorcraft is in a normal landing mode and the landing gear is not fully extended and locked. A manual shutoff capability must be provided for the warning device and the warning system must automatically reset when the rotorcraft is no longer in the landing mode.

## Notes

### Amendments

[Doc. No. 5084, 29 FR 16150, Dec. 3, 1964, as amended by Amdt. 29-24, 49 FR 44437, Nov. 6, 1984]

### Authority

Authority: 49 U.S.C. 106(f), 106(g), 40113, 44701-44702, 44704.

### Source

Source: Docket No. 5084, 29 FR 16150, Dec. 3, 1964, unless otherwise noted.

### Amendments

[Doc. No. 5084, 29 FR 16150, Dec. 3, 1964, as amended by Amdt. 29-24, 49 FR 44437, Nov. 6, 1984]