---
title: "CS 25.1447 Equipment standards for oxygen dispensing units — CS-25 · Avioverse"
description: "(See AMC 25.1447) If oxygen-dispensing units are installed, the following apply:"
url: "https://avioverse.aero/regulations/easa/cs-25/subpart-f/cs-25-1447"
---

# CS 25.1447 Equipment standards for oxygen dispensing units

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

IR Implementing rule

## CS 25.1447 Equipment standards for oxygen dispensing units

(See AMC 25.1447)

If oxygen-dispensing units are installed, the following apply:

(a) There must be an individual dispensing unit for each occupant for whom supplemental oxygen is to be supplied. Units must be designed to cover the nose and mouth and must be equipped with a suitable means to retain the unit in position on the face. Flight crew masks for supplemental oxygen must have provisions for the use of communication equipment.

(b) If certification for operation up to and including 7620 m (25 000 ft) is requested, an oxygen supply terminal and unit of oxygen dispensing equipment for the immediate use of oxygen by each crew member must be within easy reach of that crew member. For any other occupants the supply terminals and dispensing equipment must be located to allow use of oxygen as required by the operating rules.

(c) If certification for operation above 7620 m (25 000 ft) is requested, there must be oxygen dispensing equipment meeting the following requirements (See AMC 25.1447(c)):

(1) There must be an oxygen-dispensing unit connected to oxygen supply terminals immediately available to each occupant, wherever seated. If certification for operation above 9144 m (30 000 ft) is requested, the dispensing units providing the required oxygen flow must be automatically presented to the occupants before the cabin pressure altitude exceeds 4572 m (15 000 ft) and the crew must be provided with a manual means to make the dispensing units immediately available in the event of failure of the automatic system. The total number of dispensing units and outlets must exceed the number of seats by at least 10%. The extra units must be as uniformly distributed throughout the cabin as practicable. (See AMC 25.1447(c)(1).)

(2) Each flight-crew member on flight deck duty must be provided with demand equipment. In addition, each flight-crew member must be provided with a quick-donning type of oxygen dispensing unit, connected to an oxygen supply terminal, that is immediately available to him when seated at his station, and this is designed and installed so that it (see AMC 25.1447(c)(2)) –

(i) Can be placed on the face from its ready position, properly secured, sealed, and supplying oxygen upon demand, with one hand within 5 seconds and without disturbing eyeglasses or causing delay in proceeding with emergency duties; and

(ii) Allows, while in place, the performance of normal communication functions.

(3) There must be sufficient outlets and units of dispensing equipment of a type similar to that required by sub-paragraph (c)(1) of this paragraph in all other areas that may be occupied by passengers or crew members during flight. (See AMC 25.1447 (c)(3))

(4) Portable oxygen equipment must be immediately available for each cabin crew member. The portable oxygen equipment must have the oxygen dispensing unit connected to the portable oxygen supply. (See AMC 25.1447(c)(4).)

\[Amdt 25/12]

\[Amdt 25/13]

\[Amdt 25/18]

\[Amdt 25/19]

IR · CS 25.1447 — CS-25 · ED Decision 2017/015/R · CS-25 Easy Access Rules · EAR revision 26 Jan 2023

AMC Acceptable means of compliance

## AMC 25.1447(c) Equipment standards for oxygen dispensing units

Where Operational Regulations do not require all passengers to be provided with oxygen, (c)(3) and (c)(4) may not apply.

AMC · AMC 25.1447(c) — CS-25 · ED Decision 2003/2/RM · CS-25 Easy Access Rules · EAR revision 26 Jan 2023

AMC Acceptable means of compliance

## AMC 25.1447(c)(1) Equipment standards for oxygen-dispensing units

1 When oxygen masks are presented, oxygen should be supplied to the mask but without flow.

2 Oxygen flow from the mask should be initiated automatically on pulling the mask to the face.

3 Facilities for manual presentation by a crewmember should be provided on each dispensing unit.

4 Indication of the operation of the automatic presentation system should be provided at the appropriate flight-crew station.

5 The design of the automatic presentation system should take into account that when the landing field altitude is less than 610 m (2000 feet) below the normal preset automatic presentation altitude, the automatic presentation altitude may be reset to landing field altitude plus 610 m (2000 feet).

6 A supplemental oxygen supply should be provided for each passenger lying on a bed or a seat that can be converted into a bed. Except for cases where the occupant’s head location during sleeping is obvious, a placard indicating the correct sleeping position should be installed, unless the passenger oxygen system is designed to account for any sleeping position.

7 Sufficient illumination should be provided at all times or automatically when necessary (i.e. without the need of a crew action and without delay) at each location where supplemental oxygen is provided so that in the event of oxygen mask presentation, the user has sufficient visibility to enable quick donning.

\[Amdt 25/19]

AMC · AMC 25.1447(c)(1) — CS-25 · ED Decision 2017/015/R · CS-25 Easy Access Rules · EAR revision 26 Jan 2023

AMC Acceptable means of compliance

## AMC 25.1447(c)(2) Equipment standards for oxygen dispensing units

Unless it is required that the pilot at the control is wearing his mask and breathing oxygen while the altitude exceeds 7620 m (25 000 feet), the design of the flight-crew masks and their stowages should be such that each mask can be placed in position and put into operation in not more than five seconds, one hand only being used, and will thereafter remain in position, both hands being free.

AMC · AMC 25.1447(c)(2) — CS-25 · ED Decision 2003/2/RM · CS-25 Easy Access Rules · EAR revision 26 Jan 2023

AMC Acceptable means of compliance

## AMC 25.1447(c)(3) Equipment standards for oxygen-dispensing units

It is acceptable that oxygen outlets/units of dispensing equipment are not provided within an area where people are likely to congregate (for instance a waiting area for lavatory facilities, a bar/lounge area etc.), provided the applicant demonstrates that sufficient oxygen-dispensing outlets are within five feet or five seconds reach of the area and that no visual obstruction exists between the potential oxygen users and the outlets, such as curtains or partitions, unless another method of indication (e.g. an ‘oxygen in use’ light) is provided in the area.

There should be at least two outlets and units of dispensing equipment in toilets, washrooms, galley work areas etc. In such areas where occupancy of more than two persons can be expected, the number of outlets (within the area or within five feet or five seconds reach) should be consistent with the expected maximum occupancy.

In the case of a shower, there should be an oxygen outlet and unit of dispensing equipment immediately available to each shower occupant without stepping outside the shower. Reaching through an opened shower cubicle door is acceptable, in which case the door should be sufficiently transparent so that the location of the mask and the required actions to access it are immediately obvious.

\[Amdt 25/13]

\[Amdt 25/15]

\[Amdt 25/19]

AMC · AMC 25.1447(c)(3) — CS-25 · ED Decision 2017/015/R · CS-25 Easy Access Rules · EAR revision 26 Jan 2023

AMC Acceptable means of compliance

## AMC 25.1447(c)(4) Equipment standards for portable oxygen equipment

When the portable oxygen equipment (POE) is the primary means to protect cabin crew members in case of depressurisation, when seated at their stations:

1 The equipment should be so located as to be within reach of the cabin crewmembers while seated and restrained at their seat stations.

2 The mask/hose assembly should be already connected to the supply source, and oxygen should be delivered with no action being required except turning the system on and donning the mask.

3 Where a cabin crewmember’s work area is not within easy reach of the equipment provided at his or her seat station, an additional unit (oxygen dispensing unit or POE) should be provided at the work area.

When the POE is installed to allow cabin crew mobility in aeroplanes where the passenger oxygen system design allows for levelling off at altitudes between 3 048 m (10 000 ft) and 7 620 m (25 000 ft) after a depressurisation event (typically a passenger oxygen system with a gaseous oxygen source or a chemical oxygen generator with sufficient capacity):

1\. The POE should be, to the degree practicable, uniformly distributed throughout the cabin. The distribution of the POE should be such that the transfer of cabin crew members from any possible location to the nearest POE is safe. It should be assumed that cabin crew members will move around in the cabin only when they are notified by the flight crew that a safe flight level has been reached (designated as ‘level-off altitude’). Consequently, the safe transfer to POE should be demonstrated at the maximum possible level-off altitude after a depressurisation of the aeroplane. Considering potential operational scenarios, the maximum level-off altitude should be 7 620 m (25 000 ft). Any lower value should be justified by the applicant, and operational limitations should be provided in the Aeroplane Flight Manual. It can be assumed that cabin crew members will not leave their seats during an emergency descent or during temporary level-off at altitudes above 7 620 m (25 000 ft). The applicant should provide appropriate information to support cabin crew training for depressurisation events, including the recommendation that cabin crew members should not move around in the cabin until an altitude of 7 620 m (25 000 ft) or lower has been reached.

2\. The POE should be immediately available to each cabin crew member. The immediate availability is acceptable if:

— the mask is always connected to the supply source;

— oxygen can be delivered with no action being required except turning the system on and donning the mask;

— easy and unobstructed access is ensured by design.

3\. A minimum of one POE should be provided for each required cabin crew member, with even distribution throughout the passenger cabin.

AMC · AMC 25.1447(c)(4) — CS-25 · ED Decision 2003/2/RM · 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.