---
kind: "section"
citation: "14 C.F.R. § 29.549"
title: "14"
number: "29.549"
heading: "Fuselage and rotor pylon structures."
url: "https://uscodex.org/cfr/14/29.549"
---

# §29.549. Fuselage and rotor pylon structures.

- (a) Each fuselage and rotor pylon structure must be designed to withstand—
  - (1) The critical loads prescribed in §§ [29.337 through 29.341](/cfr/14/29.337..29.341.md), and [29.351](/cfr/14/29.351.md);
  - (2) The applicable ground loads prescribed in §§ [29.235](/cfr/14/29.235.md), [29.471 through 29.485](/cfr/14/29.471..29.485.md), [29.493](/cfr/14/29.493.md), [29.497](/cfr/14/29.497.md), [29.505](/cfr/14/29.505.md), and [29.521](/cfr/14/29.521.md); and
  - (3) The loads prescribed in § [29.547 (d)(1)](/cfr/14/29.547.md?p=d-1) and [(e)(1)(i)](/cfr/14/29.547.md?p=e-1-i).
- (b) Auxiliary rotor thrust, the torque reaction of each rotor drive system, and the balancing air and inertia loads occurring under accelerated flight conditions, must be considered.
- (c) Each engine mount and adjacent fuselage structure must be designed to withstand the loads occurring under accelerated flight and landing conditions, including engine torque.
- (d) [Reserved]
- (e) If approval for the use of 2 1/2-minute OEI power is requested, each engine mount and adjacent structure must be designed to withstand the loads resulting from a limit torque equal to 1.25 times the mean torque for 2 1/2-minute OEI power combined with 1g flight loads.

## Notes

### Amendments

[Doc. No. 5084, 29 FR 16150, Dec. 3, 1964, as amended by Amdt. 29-4, 33 FR 14106, Sept. 18, 1968; Amdt. 29-26, 53 FR 34215, Sept. 2, 1988]

### 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. 29-4, 33 FR 14106, Sept. 18, 1968; Amdt. 29-26, 53 FR 34215, Sept. 2, 1988]