In a check of life-support equipment, the oxygen duration for passenger generators is specified as which value in minutes?

In a check of life-support equipment, the oxygen duration for passenger generators is specified as which value in minutes?

• A. 12 minutes
• B. 13 minutes
• C. 15 minutes
• D. 25 minutes

Answer: (B)

Oxygen duration is the length of time the life-support system must continuously provide breathable oxygen after activation during a check. For passenger generators, the standard duration specified is 13 minutes, meaning the system should deliver usable oxygen for about 13 minutes under the test conditions. This duration is chosen to ensure passengers have enough oxygen while the crew handles the emergency and the aircraft descends to a safer altitude, without making the system unnecessarily heavy or complex. The other numbers don’t fit the defined check: 12 minutes is shorter than the mandated duration, 15 minutes is longer than this specification, and 25 minutes exceeds typical requirements for passenger oxygen systems.

Oxygen duration is the length of time the life-support system must continuously provide breathable oxygen after activation during a check. For passenger generators, the standard duration specified is 13 minutes, meaning the system should deliver usable oxygen for about 13 minutes under the test conditions. This duration is chosen to ensure passengers have enough oxygen while the crew handles the emergency and the aircraft descends to a safer altitude, without making the system unnecessarily heavy or complex. The other numbers don’t fit the defined check: 12 minutes is shorter than the mandated duration, 15 minutes is longer than this specification, and 25 minutes exceeds typical requirements for passenger oxygen systems.