---
kind: "section"
citation: "14 C.F.R. § 27.1435"
title: "14"
number: "27.1435"
heading: "Hydraulic systems."
url: "https://uscodex.org/cfr/14/27.1435"
---

# §27.1435. Hydraulic systems.

- (a) **Design.** Each hydraulic system and its elements must withstand, without yielding, any structural loads expected in addition to hydraulic loads.
- (b) **Tests.** Each system must be substantiated by proof pressure tests. When proof tested, no part of any system may fail, malfunction, or experience a permanent set. The proof load of each system must be at least 1.5 times the maximum operating pressure of that system.
- (c) **Accumulators.** No hydraulic accumulator or pressurized reservoir may be installed on the engine side of any firewall unless it is an integral part of an engine.

## 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.