Above which altitude must oxygen always be supplied for everybody on board?

Above which altitude must oxygen always be supplied for everybody on board?

• A. 10,000 ASL
• B. 13,000 ASL
• C. FL250
• D. 15,000 ASL

Answer: (B)

The requirement for oxygen supply on board an aircraft is dictated by regulations concerning cabin pressure and altitude. Above an altitude of 13,000 feet above sea level (ASL), regulations mandate that oxygen be provided for all occupants of the aircraft, ensuring their safety and health, as the partial pressure of oxygen decreases significantly at these heights. Cabin pressure at altitudes greater than 13,000 feet can lead to hypoxia—a condition where the body doesn’t get sufficient oxygen, which can impair cognitive and physical performance. Consequently, to prevent such risks, regulations stipulate that supplemental oxygen must be readily available to all passengers and crew members when flying at or above this altitude. Higher altitudes, such as those mentioned in other options (like 15,000 ASL or FL250), impose additional requirements for oxygen use among the flight crew, but the threshold for ensuring the availability of oxygen for everyone on board is specifically set at 13,000 ASL. This distinction is crucial for ensuring safety during flight operations.

The requirement for oxygen supply on board an aircraft is dictated by regulations concerning cabin pressure and altitude. Above an altitude of 13,000 feet above sea level (ASL), regulations mandate that oxygen be provided for all occupants of the aircraft, ensuring their safety and health, as the partial pressure of oxygen decreases significantly at these heights.

Cabin pressure at altitudes greater than 13,000 feet can lead to hypoxia—a condition where the body doesn’t get sufficient oxygen, which can impair cognitive and physical performance. Consequently, to prevent such risks, regulations stipulate that supplemental oxygen must be readily available to all passengers and crew members when flying at or above this altitude.

Higher altitudes, such as those mentioned in other options (like 15,000 ASL or FL250), impose additional requirements for oxygen use among the flight crew, but the threshold for ensuring the availability of oxygen for everyone on board is specifically set at 13,000 ASL. This distinction is crucial for ensuring safety during flight operations.