What is the minimum requirement for supplemental oxygen in the event of a cabin pressure failure, according to EASA AIR OPS?

The minimum requirement for supplemental oxygen in the event of a cabin pressure failure, according to EASA AIR OPS, specifies that 10 minutes of oxygen supply is necessary after the cabin altitude exceeds 15,000 feet. This requirement is established to ensure that both crew and passengers have a sufficient supply of oxygen to prevent hypoxia while the aircraft descends to a safer altitude where supplemental oxygen is no longer needed.

This provision helps manage the risks associated with sudden changes in cabin pressure, particularly at higher altitudes where oxygen levels become critically low. The 10-minute timeframe is crucial, as it provides adequate time for the aircraft to descend to a lower altitude, specifically below 10,000 feet, where atmospheric pressure is sufficient for normal breathing.

The other options considered do not align with EASA regulations, which specify a more immediate response and shorter duration requirements than the longer durations suggested in some of the alternatives.