---
title: "CAT.IDE.A.240 Supplemental oxygen – non-pressurised aeroplanes — Part-CAT · Avioverse"
description: "Non-pressurised aeroplanes 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-a-240"
---

# CAT.IDE.A.240 Supplemental oxygen – non-pressurised aeroplanes

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

IR Implementing rule

## CAT.IDE.A.240 Supplemental oxygen – non-pressurised aeroplanes

Non-pressurised aeroplanes 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 Table 1.

Table 1

Oxygen minimum requirements for non-pressurised aeroplanes

| 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.                                                         |                                                                                                                                                                         |

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

AMC Acceptable means of compliance

## AMC1 CAT.IDE.A.240 Supplemental oxygen – non-pressurised aeroplanes

AMOUNT OF SUPPLEMENTAL 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.A.240 — Regulation (EU) No 965/2012 · ED Decision 2014/015/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.