---
title: "CS 25.1723 Flammable fluid protection; EWIS — CS-25 · Avioverse"
description: "(See AMC 25.1723) EWIS components must be considered to be a potential ignition source in each area where flammable fluid or vapours might escape by…"
url: "https://avioverse.aero/regulations/easa/cs-25/subpart-h/cs-25-1723"
---

# CS 25.1723 Flammable fluid protection; EWIS

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

IR Implementing rule

## CS 25.1723 Flammable fluid protection; EWIS

(See AMC 25.1723)

EWIS components must be considered to be a potential ignition source in each area where flammable fluid or vapours might escape by leakage of a fluid system and must meet the requirements of CS 25.863.

\[Amdt 25/5]

IR · CS 25.1723 — CS-25 · ED Decision 2008/006/R · CS-25 Easy Access Rules · EAR revision 26 Jan 2023

AMC Acceptable means of compliance

## AMC 25.1723 Flammable fluid protection: EWIS

CS 25.1723 requires that EWIS located in areas where flammable fluid or vapours might escape must be considered to be a potential ignition source. As a result, these EWIS components must meet the requirements of CS 25.863. CS 25.863 requires that efforts be made to minimise the probability of ignition of fluids and vapours, and the hazards if ignition does occur. See CS 25.1707 for the separation requirements between EWIS and flammable fluids.

EWIS components located in fuel vapour zones should be qualified as explosion proof, where appropriate, in accordance with Section 9 of EUROCAE ED-14G / RTCA Document DO-160G or other equivalent approved industry standard. The possibility of contamination with flammable fluids due to spillage during maintenance action should also be considered.

\[Amdt 25/5]

AMC · AMC 25.1723 — 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.