§ 27.1357. Circuit protective devices.

241 words·~1 min read·/us/cfr/t14/s§ 27.1357·

A research copy — for the controlling text, always check the official state or federal source. Not legal advice.

(a)Protective devices, such as fuses or circuit breakers, must be installed in each electrical circuit other than—

(1)The main circuits of starter motors; and

(2)Circuits in which no hazard is presented by their omission.

(b)A protective device for a circuit essential to flight safety may not be used to protect any other circuit.

(c)Each resettable circuit protective device (“trip free” device in which the tripping mechanism cannot be overridden by the operating control) must be designed so that—

(1)A manual operation is required to restore service after trippling; and

(2)If an overload or circuit fault exists, the device will open the circuit regardless of the position of the operating control.

(d)If the ability to reset a circuit breaker or replace a fuse is essential to safety in flight, that circuit breaker or fuse must be located and identified so that it can be readily reset or replaced in flight.

(e)If fuses are used, there must be one spare of each rating, or 50 percent spare fuses of each rating, whichever is greater. (Secs. 313(a), 601, 603, 604, and 605 of the Federal Aviation Act of 1958 (49 U.S.C. 1354(a), 1421, 1423, 1424, and 1425); and sec. 6(c) of the Dept. of Transportation Act (49 U.S.C. 1655(c))) [Doc. No. 5074, 29 FR 15695, Nov. 24, 1964; 29 FR 17885, Dec. 17, 1964, as amended by Amdt. 27-13, 42 FR 36972, July 18, 1977]

Connections2 off-index

2 references not yet in our index

49 USC 1354(a)
49 USC 1655(c)

Citation graph

cites case law

§ 27.1357

Circuit protective devices.

Cite49 USC 1354(a)

Cite49 USC 1655(c)

Cites 2Cited by 0 across 0 sources