---
title: "CS 25.1197 Fire-extinguishing agents — CS-25 · Avioverse"
description: "(See AMC 25.1197.) (a) Fire-extinguishing agents must – (1) Be capable of extinguishing flames emanating from any burning of fluids or other combustible…"
url: "https://avioverse.aero/regulations/easa/cs-25/subpart-e/cs-25-1197"
---

# CS 25.1197 Fire-extinguishing agents

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

IR Implementing rule

## CS 25.1197 Fire-extinguishing agents

(See AMC 25.1197.)

(a) Fire-extinguishing agents must –

(1) Be capable of extinguishing flames emanating from any burning of fluids or other combustible materials in the area protected by the fire extinguishing system; and

(2) Have thermal stability over the temperature range likely to be experienced in the compartment in which they are stored.

(b) If any toxic extinguishing agent is used, provisions must be made to prevent harmful concentrations of fluid or fluid vapours (from leakage during normal operation of the aeroplane or as a result of discharging the fire extinguisher on the ground or in flight) from entering any personnel compartment, even though a defect may exist in the extinguishing system. This must be shown by test except for built-in carbon dioxide fuselage compartment fire extinguishing systems for which –

(1) 2.3 kg (five pounds) or less of carbon dioxide will be discharged, under established fire control procedures, into any fuselage compartment; or

(2) There is protective breathing equipment for each flight-crew member on flight deck duty.

\[Amdt 25/12]

IR · CS 25.1197 — CS-25 · ED Decision 2012/008/R · CS-25 Easy Access Rules · EAR revision 26 Jan 2023

AMC Acceptable means of compliance

## AMC 25.1197 Fire-Extinguishing Agents

Halon 1301 is no longer an acceptable extinguishing agent, based on EU Law, for engine nacelle and APU fire extinction systems to be installed in aircraft types, for which type certification is requested after 31 December 2014. (See AMC 25.851(c) for more information on Halon alternatives.)

\[Amdt 25/12]

AMC · AMC 25.1197 — CS-25 · ED Decision 2012/008/R · CS-25 Easy Access Rules · EAR revision 26 Jan 2023

[All rules in SUBPART E – POWERPLANT](https://avioverse.aero/regulations/easa/cs-25/subpart-e)

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.