During a preflight, must the mask be removed from its container to perform a preflight oxygen mask test?

During a preflight, must the mask be removed from its container to perform a preflight oxygen mask test?

• A. No
• B. Yes
• C. Only if the seal is broken
• D. Only on the ground

Answer: (A)

Testing the oxygen system during a preflight is done with the masks still in their housings. The system is designed to be checked using the built-in test function or by activating the oxygen generator, which confirms that oxygen will flow to the mask and that the supply is within limits without removing the mask. Removing the mask from its container isn’t required and could cause unintended deployment or contamination, wasting oxygen and potentially compromising the test. So the correct approach is to verify operation while the mask remains in place.

Testing the oxygen system during a preflight is done with the masks still in their housings. The system is designed to be checked using the built-in test function or by activating the oxygen generator, which confirms that oxygen will flow to the mask and that the supply is within limits without removing the mask. Removing the mask from its container isn’t required and could cause unintended deployment or contamination, wasting oxygen and potentially compromising the test. So the correct approach is to verify operation while the mask remains in place.