---
kind: "section"
citation: "14 C.F.R. § 27.695"
title: "14"
number: "27.695"
heading: "Power boost and power-operated control system."
url: "https://uscodex.org/cfr/14/27.695"
---

# §27.695. Power boost and power-operated control system.

- (a) If a power boost or power-operated control system is used, an alternate system must be immediately available that allows continued safe flight and landing in the event of—
  - (1) Any single failure in the power portion of the system; or
  - (2) **The failure of all engines.**
- (b) Each alternate system may be a duplicate power portion or a manually operated mechanical system. The power portion includes the power source (such as hydraulic pumps), and such items as valves, lines, and actuators.
- (c) The failure of mechanical parts (such as piston rods and links), and the jamming of power cylinders, must be considered unless they are extremely improbable.

## 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.