How do you verify crew oxygen requirements in flight?

How do you verify crew oxygen requirements in flight?

• A. Check cabin light brightness.
• B. Ensure crew oxygen supply is within AFM specifications for expected cabin altitude and duration.
• C. Confirm fuel burn rate.
• D. Verify seatbelt sign status.

Answer: (B)

The important principle is that crew oxygen must be sized and available to keep the flight crew oxygenated for the duration of the expected emergency at the anticipated cabin altitude. The AFM defines how long the crew oxygen system must last and the performance it must deliver at the specified cabin altitude. So the way to verify is to confirm that the crew oxygen supply meets those AFM specifications for the flight’s expected cabin altitude and duration. This ensures the pilots have reliable oxygen long enough to manage an emergency and descend to a safe altitude. Options that involve cabin light brightness, fuel burn rate, or seatbelt sign status don’t relate to oxygen readiness, so they don’t verify the crew’s oxygen requirements.

The important principle is that crew oxygen must be sized and available to keep the flight crew oxygenated for the duration of the expected emergency at the anticipated cabin altitude. The AFM defines how long the crew oxygen system must last and the performance it must deliver at the specified cabin altitude. So the way to verify is to confirm that the crew oxygen supply meets those AFM specifications for the flight’s expected cabin altitude and duration. This ensures the pilots have reliable oxygen long enough to manage an emergency and descend to a safe altitude.

Options that involve cabin light brightness, fuel burn rate, or seatbelt sign status don’t relate to oxygen readiness, so they don’t verify the crew’s oxygen requirements.