---
title: "CS 25.1449 Means for determining use of oxygen — CS-25 · Avioverse"
description: "(See AMC 25.1449) There must be a means to allow the crew to determine whether oxygen is being delivered to the dispensing equipment."
url: "https://avioverse.aero/regulations/easa/cs-25/subpart-f/cs-25-1449"
---

# CS 25.1449 Means for determining use of oxygen

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

IR Implementing rule

## CS 25.1449 Means for determining use of oxygen

(See AMC 25.1449)

There must be a means to allow the crew to determine whether oxygen is being delivered to the dispensing equipment.

IR · CS 25.1449 — CS-25 · ED Decision 2003/2/RM · CS-25 Easy Access Rules · EAR revision 26 Jan 2023

AMC Acceptable means of compliance

## AMC 25.1449 Means for determining use of oxygen

CS 25.1449 is also applicable to portable oxygen equipment.

A flow indicator should be provided, unless it can be shown that the inflation of the economiser system, or another appropriate means, provides an effective indication. A system using a simple rebreathing bag would not be considered an acceptable means of indication.

AMC · AMC 25.1449 — CS-25 · CS-25 Easy Access Rules · EAR revision 26 Jan 2023

[All rules in SUBPART F – EQUIPMENT](https://avioverse.aero/regulations/easa/cs-25/subpart-f)

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.