---
title: "CAT.IDE.H.240 Supplemental oxygen – non-pressurised helicopters — Part-CAT · Avioverse"
description: "Non-pressurised helicopters operated at pressure altitudes above 10 000 ft shall be equipped with supplemental oxygen equipment capable of storing and…"
url: "https://avioverse.aero/regulations/easa/air-ops/part-cat/subpart-d/cat-ide-h-240"
---

# CAT.IDE.H.240 Supplemental oxygen – non-pressurised helicopters

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

IR Implementing rule

## CAT.IDE.H.240 Supplemental oxygen – non-pressurised helicopters

Non-pressurised helicopters operated at pressure altitudes above 10 000 ft shall be equipped with supplemental oxygen equipment capable of storing and dispensing the oxygen supplies in accordance with the following tables.

Table 1

Oxygen minimum requirements for complex non-pressurised helicopters

| Supply for                                                                                                                                                                        | Duration and cabin pressure altitude                                                                                                                                    |
| --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| 1. Occupants of flight crew compartment seats on flight crew compartment [duty](https://avioverse.aero/glossary/easa/duty) and crew members assisting flight crew in their duties | The entire flying time at pressure altitudes above 10 000 ft.                                                                                                           |
| 2. Required cabin crew members                                                                                                                                                    | The entire flying time at pressure altitudes above 13 000 ft and for any period exceeding 30 minutes at pressure altitudes above 10 000 ft but not exceeding 13 000 ft. |
| 3. Additional crew members and 100 % of passengers(1)                                                                                                                             | The entire flying time at pressure altitudes above 13 000 ft.                                                                                                           |
| 4. 10 % of passengers(1)                                                                                                                                                          | The entire flying time after 30 minutes at pressure altitudes above 10 000 ft but not exceeding 13 000 ft.                                                              |
| (1) Passenger numbers in Table 1 refer to passengers actually carried on board including persons younger than 24 months.                                                          |                                                                                                                                                                         |

Table 2

Oxygen minimum requirements for other-than-complex non-pressurised helicopters

| Supply for                                                                                                                                                         | Duration and cabin pressure altitude                                                                                                                                    |
| ------------------------------------------------------------------------------------------------------------------------------------------------------------------ | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| 1. Occupants of flight crew compartment seats on flight crew compartment duty, crew members assisting flight crew in their duties, and required cabin crew members | The entire flying time at pressure altitudes above 13 000 ft and for any period exceeding 30 minutes at pressure altitudes above 10 000 ft but not exceeding 13 000 ft. |
| 2. Additional crew members and 100 % of passengers(1)                                                                                                              | The entire flying time at pressure altitudes above 13 000 ft.                                                                                                           |
| 3. 10 % of passengers(1)                                                                                                                                           | The entire flying time after 30 minutes at pressure altitudes above 10 000 ft but not exceeding 13 000 ft.                                                              |
| (1) Passenger numbers in Table 2 refer to passengers actually carried on board including persons younger than 24 months.                                           |                                                                                                                                                                         |

IR · CAT.IDE.H.240 — Regulation (EU) No 965/2012 · Air OPS Easy Access Rules · EAR revision 27 Mar 2026

AMC Acceptable means of compliance

## AMC1 CAT.IDE.H.240 Supplemental oxygen – non-pressurised helicopters

DETERMINATION OF OXYGEN

The amount of supplemental oxygen for sustenance for a particular operation should be determined on the basis of flight altitudes 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 operations manual.

AMC · AMC1 CAT.IDE.H.240 — Regulation (EU) No 965/2012 · ED Decision 2014/015/R · Air OPS Easy Access Rules · EAR revision 27 Mar 2026

AMC Acceptable means of compliance

## AMC2 CAT.IDE.H.240 Supplemental oxygen — non-pressurised helicopters

OXYGEN STORAGE AND DISPENSING EQUIPMENT

(a) Supplemental oxygen requirements may be met either by means of either installed or portable equipment.

(b) The use of oxygen dispensers should not prevent the crew from performing their intended tasks, including any radio communications.

(c) The oxygen-dispensing unit may consist of a nasal oxygen cannula.

AMC · AMC2 CAT.IDE.H.240 — Regulation (EU) No 965/2012 · ED Decision 2023/007/R · Air OPS Easy Access Rules · EAR revision 27 Mar 2026

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