---
title: "NCO.IDE.A.155 Supplemental oxygen – non-pressurised aeroplanes — Part-NCO · Avioverse"
description: "Non-pressurised aeroplanes operated when an oxygen supply is required in accordance with NCO.OP.190 shall be equipped with oxygen storage and dispensing…"
url: "https://avioverse.aero/regulations/easa/air-ops/part-nco/subpart-d/nco-ide-a-155"
---

# NCO.IDE.A.155 Supplemental oxygen – non-pressurised aeroplanes

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

IR Implementing rule

## NCO.IDE.A.155 Supplemental oxygen – non-pressurised aeroplanes

Non-pressurised aeroplanes operated when an oxygen supply is required in accordance with NCO.OP.190 shall be equipped with oxygen storage and dispensing apparatus capable of storing and dispensing the required oxygen supplies.

IR · NCO.IDE.A.155 — Regulation (EU) No 965/2012 · Regulation (EU) 2016/1199 · Air OPS Easy Access Rules · EAR revision 27 Mar 2026

AMC Acceptable means of compliance

## AMC1 NCO.IDE.A.155 Supplemental oxygen – non-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 operate at 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 and flight duration.

AMC · AMC1 NCO.IDE.A.155 — Regulation (EU) No 965/2012 · ED Decision 2014/016/R · Air OPS Easy Access Rules · EAR revision 27 Mar 2026

AMC Acceptable means of compliance

## AMC2 NCO.IDE.A.155 Supplemental oxygen supply – non-pressurised aeroplanes

OXYGEN SUPPLY

The need for oxygen supply, when required by NCO.OP.190, may be met either by means of installed equipment or portable equipment.

AMC · AMC2 NCO.IDE.A.155 — Regulation (EU) No 965/2012 · ED Decision 2016/018/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.