---
title: "CS 25.1725 Powerplants; EWIS — CS-25 · Avioverse"
description: "EWIS associated with any powerplant must be designed and installed so that the failure of an EWIS component will not prevent the continued safe operation…"
url: "https://avioverse.aero/regulations/easa/cs-25/subpart-h/cs-25-1725"
---

# CS 25.1725 Powerplants; EWIS

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

IR Implementing rule

## CS 25.1725 Powerplants; EWIS

(a) EWIS associated with any powerplant must be designed and installed so that the failure of an EWIS component will not prevent the continued safe operation of the remaining powerplants or require immediate action by any crew member for continued safe operation, in accordance with the requirements of CS 25.903(b).

(b) Design precautions must be taken to minimise hazards to the aeroplane due to EWIS damage in the event of a powerplant rotor failure or of a fire originating within the powerplant, which burns through the powerplant case, in accordance with the requirements of CS 25.903(d)(1).

\[Amdt 25/5]

IR · CS 25.1725 — 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](https://avioverse.aero/regulations/easa/cs-25/subpart-h)

Consolidated from the EASA Easy Access Rules (revision 26 Jan 2023, extracted 13 Oct 2026) for convenience. Not the official publication — verify against the Official Journal of the European Union and the EASA publications before operational use.