---
kind: "section"
citation: "14 C.F.R. § 27.953"
title: "14"
number: "27.953"
heading: "Fuel system independence."
url: "https://uscodex.org/cfr/14/27.953"
---

# §27.953. Fuel system independence.

- (a) Each fuel system for multiengine rotorcraft must allow fuel to be supplied to each engine through a system independent of those parts of each system supplying fuel to other engines. However, separate fuel tanks need not be provided for each engine.
- (b) If a single fuel tank is used on a multiengine rotorcraft, the following must be provided:
  - (1) **Independent tank outlets for each engine, each incorporating a shutoff valve at the tank.** This shutoff valve may also serve as the firewall shutoff valve required by [§ 27.995](/cfr/14/27.995.md) if the line between the valve and the engine compartment does not contain a hazardous amount of fuel that can drain into the engine compartment.
  - (2) At least two vents arranged to minimize the probability of both vents becoming obstructed simultaneously.
  - (3) **Filler caps designed to minimize the probability of incorrect installation or inflight loss.**
  - (4) A fuel system in which those parts of the system from each tank outlet to any engine are independent of each part of each system supplying fuel to other engines.

## Notes

### Authority

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

### Source

Source: Docket No. 5074, 29 FR 15695, Nov. 24, 1964, unless otherwise noted.