---
title: "NCO.IDE.H.155 Supplemental oxygen – non-pressurised rotorcraft — Part-NCO · Avioverse"
description: "Non-pressurised rotorcraft 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-h-155"
---

# NCO.IDE.H.155 Supplemental oxygen – non-pressurised rotorcraft

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

IR Implementing rule

## NCO.IDE.H.155 Supplemental oxygen – non-pressurised rotorcraft

Non-pressurised [rotorcraft](https://avioverse.aero/glossary/easa/rotorcraft) 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.H.155 — Regulation (EU) No 965/2012 · Regulation (EU) 2025/133 · Air OPS Easy Access Rules · EAR revision 27 Mar 2026

AMC Acceptable means of compliance

## AMC1 NCO.IDE.H.155 Supplemental oxygen – non-pressurised helicopters

DETERMINATION OF OXYGEN

The amount of oxygen should be determined on the basis of cabin pressure altitude and flight duration, consistent with the operating procedures, including emergency procedures, established for each operation and the routes to be flown as specified in the AFM.

AMC · AMC1 NCO.IDE.H.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.H.155 Supplemental oxygen supply – non-pressurised helicopters

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.H.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.