Does CS 29.1355 require that the alternative power source for dual-fed equipment be automatically activated, or is manual selection allowed?

The rule allows either automatic provision or manual selectability of the other power source to maintain equipment or system operation.

CS 29.1355 Distribution system

Q: When two independent sources of electrical power are required for particular equipment or systems, what must happen in the event of failure of one power source?

Another power source (including its separate feeder) must be provided automatically or be manually selectable to maintain equipment or system operation.

Q: Under CS 29.1355, is it acceptable to have only a single feeder for equipment that requires two independent power sources?

No, because in the event of failure of one power source, another power source including its separate feeder must be provided automatically or be manually selectable to maintain operation.

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CS 29.1355 Distribution system

ED Decision 2003/16/RM

(a) The distribution system includes the distribution busses, their associated feeders, and each control and protective device.

(b) If two independent sources of electrical power for particular equipment or systems are required by any applicable CS or operating rule, in the event of the failure of one power source for such equipment or system, another power source (including its separate feeder) must be provided automatically or be manually selectable to maintain equipment or system operation.

Details

Source-Title: CS 29.1355 Distribution system View latest amendments

Erulesid: ERULES-1963177438-5664 Compare versions

Domain: Initial airworthiness

Amendedby: Initial issue

Applicabilitydate: 14 November, 2003

Entryintoforcedate: 14 November, 2003

Regulatorysource: ED Decision 2003/16/RM Navigate

Regulatorysubject: CS-29

Typeofcontent: CS (Certification specification)

Origin: EASA

Category: EAR