---
title: "NCO.IDE.A.150 Supplemental oxygen – pressurised aeroplanes — Part-NCO · Avioverse"
description: "Pressurised aeroplanes operated at flight altitudes for which the oxygen supply is required in accordance with (b) shall be equipped with oxygen storage…"
url: "https://avioverse.aero/regulations/easa/air-ops/part-nco/subpart-d/nco-ide-a-150"
---

# NCO.IDE.A.150 Supplemental oxygen – pressurised aeroplanes

ANNEX VII (Part-NCO) · Regulation (EU) No 965/2012 · EAR revision 27 Mar 2026

IR Implementing rule

## NCO.IDE.A.150 Supplemental oxygen – pressurised aeroplanes

(a) Pressurised aeroplanes operated at flight altitudes for which the oxygen supply is required in accordance with (b) shall be equipped with oxygen storage and dispensing apparatus capable of storing and dispensing the required oxygen supplies.

(b) Pressurised aeroplanes operated above flight altitudes at which the pressure altitude in the passenger compartments is above 10 000 ft shall carry enough breathing oxygen to supply:

(1) all crew members and:

(i) 100 % of the passengers for any period when the cabin pressure altitude exceeds 15 000 ft, but in no case less than 10 minutes’ supply;

(ii) at least 30 % of the passengers, for any period when, in the event of loss of pressurisation and taking into account the circumstances of the flight, the pressure altitude in the passenger compartment will be between 14 000 ft and 15 000 ft; and

(iii) at least 10 % of the passengers for any period in excess of 30 minutes when the pressure altitude in the passenger compartment will be between 10 000 ft and 14 000 ft;

and

(2) all the occupants of the passenger compartment for no less than 10 minutes, in the case of aeroplanes operated at pressure altitudes above 25 000 ft, or operated below that altitude but under conditions that will not allow them to descend safely to a pressure altitude of 13 000 ft within 4 minutes.

(c) Pressurised aeroplanes operated at flight altitudes above 25 000 ft shall, in addition, be equipped with a device to provide a warning indication to the flight crew of any loss of pressurisation.

IR · NCO.IDE.A.150 — Regulation (EU) No 965/2012 · Regulation (EU) No 800/2013 · Air OPS Easy Access Rules · EAR revision 27 Mar 2026

AMC Acceptable means of compliance

## AMC1 NCO.IDE.A.150 Supplemental oxygen – pressurised aeroplanes

DETERMINATION OF OXYGEN

(a) In the determination of the amount of oxygen for the routes to be flown, it is assumed that the [aeroplane](https://avioverse.aero/glossary/easa/aeroplane) will descend in accordance with the emergency procedures specified in the AFM, without exceeding its operating limitations, to a flight altitude that will allow the flight to be completed safely (i.e. flight altitudes ensuring adequate terrain clearance, navigational accuracy, hazardous weather avoidance, etc.).

(b) The amount of oxygen should be determined on the basis of cabin pressure altitude, flight duration, and on the assumption that a cabin pressurisation failure will occur at the pressure altitude or point of flight that is most critical from the standpoint of oxygen need.

(c) Following a cabin pressurisation failure, the cabin pressure altitude should be considered to be the same as the aeroplane pressure altitude, unless it can be demonstrated to the competent authority that no probable failure of the cabin or pressurisation system will result in a cabin pressure altitude equal to the aeroplane pressure altitude. Under these circumstances, the demonstrated maximum cabin pressure altitude may be used as a basis for determination of oxygen supply.

AMC · AMC1 NCO.IDE.A.150 — Regulation (EU) No 965/2012 · ED Decision 2014/016/R · Air OPS Easy Access Rules · EAR revision 27 Mar 2026

[All rules in SUBPART D: INSTRUMENTS, DATA AND EQUIPMENT](https://avioverse.aero/regulations/easa/air-ops/part-nco/subpart-d)

Consolidated from the EASA Easy Access Rules (revision 27 Mar 2026, 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.