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CS 25.1731 Powerplant and APU fire detector system; EWIS

Large Aeroplanes (CS-25) · CS-25 · EAR revision 26 Jan 2023

IRImplementing rule

CS 25.1731Powerplant and APU fire detector system; EWIS

(a)EWIS that are part of each fire or overheat detector system in a fire zone must be at least 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.

[Amdt 25/5]

IR · CS 25.1731 — CS-25 · ED Decision 2008/006/R · CS-25 Easy Access Rules · EAR revision 26 Jan 2023

All rules in SUBPART H – ELECTRICAL WIRING INTERCONNECTION SYSTEMS

Consolidated from the EASA Easy Access Rules (revision 26 Jan 2023, extracted 17 Aug 2026) for convenience. Not the official publication — verify against the Official Journal of the European Union and the EASA publications before operational use.

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