---
kind: "section"
citation: "14 C.F.R. § 25.901"
title: "14"
number: "25.901"
heading: "Installation."
url: "https://uscodex.org/cfr/14/25.901"
---

# §25.901. Installation.

- (a) **For the purpose of this part, the airplane powerplant installation includes each component that—**
  - (1) Is necessary for propulsion;
  - (2) Affects the control of the major propulsive units; or
  - (3) **Affects the safety of the major propulsive units between normal inspections or overhauls.**
- (b) **For each powerplant—**
  - (1) The installation must comply with—
    - (i) The installation instructions provided under §§ [33.5](/cfr/14/33.5.md) and [35.3](/cfr/14/35.3.md) of this chapter; and
    - (ii) The applicable provisions of this subpart;
  - (2) The components of the installation must be constructed, arranged, and installed so as to ensure their continued safe operation between normal inspections or overhauls;
  - (3) The installation must be accessible for necessary inspections and maintenance; and
  - (4) The major components of the installation must be electrically bonded to the other parts of the airplane.
- (c) For each powerplant and auxiliary power unit installation, the applicant must comply with the requirements of [§ 25.1309](/cfr/14/25.1309.md), except that the effects of the following failures need not comply with [§ 25.1309(b)](/cfr/14/25.1309.md?p=b)—
  - (1) Engine case burn-through or rupture,
  - (2) Uncontained engine rotor failure, and
  - (3) **Propeller debris release.**
- (d) Each auxiliary power unit installation must meet the applicable provisions of this subpart.

## Notes

### Amendments

[Doc. No. 5066, 29 FR 18291, Dec. 24, 1964, as amended by Amdt. 25-23, 35 FR 5676, Apr. 8, 1970; Amdt. 25-40, 42 FR 15042, Mar. 17, 1977; Amdt. 25-46, 43 FR 50597, Oct. 30, 1978; Amdt. 25-126, 73 FR 63345, Oct. 24, 2008; Doc. No. FAA-2022-1544, 89 FR 68734, Aug. 27, 2024]

### Authority

Authority: 49 U.S.C. 106(f), 106(g), 40113, 44701, 44702 and 44704; Pub. L. 115-254, 132 Stat 3281 (49 U.S.C. 44903 note).

### Source

Source: Docket No. 5066, 29 FR 18291, Dec. 24, 1964, unless otherwise noted.

### Amendments

[Doc. No. 5066, 29 FR 18291, Dec. 24, 1964, as amended by Amdt. 25-23, 35 FR 5676, Apr. 8, 1970; Amdt. 25-40, 42 FR 15042, Mar. 17, 1977; Amdt. 25-46, 43 FR 50597, Oct. 30, 1978; Amdt. 25-126, 73 FR 63345, Oct. 24, 2008; Doc. No. FAA-2022-1544, 89 FR 68734, Aug. 27, 2024]