How long does the emergency O2 cylinder provide oxygen during ejection?

The emergency O2 cylinder is designed to provide oxygen for a duration of 10 minutes during ejection, ensuring that the pilot has sufficient oxygen while ascending to a safe altitude in the event the aircraft is ejected from. This critical timeframe allows the pilot to breathe normally as they leave the aircraft, which may be necessary for survival in environments where the atmosphere is insufficient or high altitude is reached quickly. After 10 minutes, the oxygen supply is either depleted or may no longer be necessary once the ejection seat reaches a lower altitude where fresh air is available.

The other options suggest different times, such as 5 or 7 minutes, which understate the capability of the emergency O2 system in providing a longer oxygen supply vital for safety. The option that refers to altitude is also inaccurate, as the primary factor for the duration is the time limit designed into the emergency procedures, rather than reaching a specific altitude. Thus, 10 minutes is the established specification, aligning with the need for sufficient oxygen during ejection.