---
kind: "section"
citation: "14 C.F.R. § 23.2440"
title: "14"
number: "23.2440"
heading: "Powerplant fire protection."
url: "https://uscodex.org/cfr/14/23.2440"
---

# §23.2440. Powerplant fire protection.

- (a) A powerplant, auxiliary power unit, or combustion heater that includes a flammable fluid and an ignition source for that fluid must be installed in a designated fire zone.
- (b) Each designated fire zone must provide a means to isolate and mitigate hazards to the airplane in the event of fire or overheat within the zone.
- (c) **Each component, line, fitting, and control subject to fire conditions must—**
  - (1) Be designed and located to prevent hazards resulting from a fire, including any located adjacent to a designated fire zone that may be affected by fire within that zone;
  - (2) Be fire-resistant if carrying flammable fluid, gas or air, or is required to operate in the event of a fire; and
  - (3) **Be fireproof or enclosed by a fire proof shield if storing concentrated flammable fluids.**
- (d) The applicant must provide a means to prevent hazardous quantities of flammable fluids from flowing into, within or through each designated fire zone. This means must—
  - (1) Not restrict flow or limit operation of any remaining powerplant or auxiliary power unit, or equipment necessary for safety;
  - (2) Prevent inadvertent operation; and
  - (3) Be located outside the fire zone unless an equal degree of safety is provided with a means inside the fire zone.
- (e) A means to ensure the prompt detection of fire must be provided for each designated fire zone—
  - (1) On a multiengine airplane where detection will mitigate likely hazards to the airplane; or
  - (2) **That contains a fire extinguisher.**
- (f) A means to extinguish fire within a fire zone, except a combustion heater fire zone, must be provided for—
  - (1) Any fire zone located outside the pilot's view;
  - (2) Any fire zone embedded within the fuselage, which must also include a redundant means to extinguish fire; and
  - (3) **Any fire zone on a level 4 airplane.**

## Notes

### Amendments

[Doc. No. FAA-2015-1621, Amdt. 23-64, 81 FR 96689, Dec. 30, 2016, as amended by Doc. No. FAA-2022-1355, Amdt. 23-65, 87 FR 75710, Dec. 9, 2022]

### Authority

Authority: 49 U.S.C. 106(f), 106(g), 40113, 44701-44702, 44704, Pub. L. 113-53, 127 Stat. 584 (49 U.S.C. 44704) note.

### Source

Source: Doc. No. FAA-2015-1621, Amdt. 23-64, 81 FR 96689, Dec. 30, 2016, unless otherwise noted.

### Amendments

[Doc. No. FAA-2015-1621, Amdt. 23-64, 81 FR 96689, Dec. 30, 2016, as amended by Doc. No. FAA-2022-1355, Amdt. 23-65, 87 FR 75710, Dec. 9, 2022]