Federal Aviation Regulations
Sec. 25.1731 — Powerplant and APU fire detector system: EWIS.
(a) EWIS that are part of each fire or overheat detector system in a fire zone must be fire-resistant.(b) No EWIS component of any fire or overheat detector system for any fire zone may pass through another fire zone, unless:
(1) It is protected against the possibility of false warnings resulting from fires in zones through which it passes; or
(2) Each zone involved is simultaneously protected by the same detector and extinguishing system.
(c) EWIS that are part of each fire or overheat detector system in a fire zone must meet the requirements of §25.1203.
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