Aircrew oxygen masks may be full face masks covering the entire face or a mask that covers just the mouth and nose. The masks and regulators should also be inspected and tested by maintenance personnel at predetermined intervals.

Oxygen quantity, mask and microphone functionality are normally checked by the flight crew during the aircraft preflight checks. The masks are normally of the “quick donning” type that enable the aircrew to don them with one hand and in less than five seconds. a depressurisation event causing an increase in the cabin altitude to a level requiring supplemental oxygen), the aircrew will be required to don their oxygen masks. In the event of a situation requiring the aircrew’s use of supplemental oxygen (e.g. The article Aircraft Oxygen Systems provides more information on system requirements and architecture.

The Standards and Recommended Practices (SARPS) in the annex provide guidance on the requirements for oxygen mask use based on the cabin altitude of the aircraft. National regulations governing the required use of oxygen masks by aircrew are based on the information provided in International Civil Aviation Organisation (ICAO) Annex 6, Operation of Aircraft. The use of the mask will be determined by organisational policy and national regulations. The masks are used in the event of a depressurisation event that raises the cabin altitude above an acceptable level, as determined by national regulations, or for a smoke or fumes event. If required by regulation for the type and environment of operations, oxygen masks must be available for the aircrew to provide them with a source of breathable air.

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