Who puts the oxygen masks back in their stowed position after a plane loses pressure and oxygen masks deploy? Is there a standard/certification process to make sure it’s done properly or do they “just shove ’em back in there” and close the door?

– Jon, Delaware

If the masks are used in the event of an passenger oxygen mask deployment, the oxygen generator in each passenger service unit must be replaced. A maintenance technician replaces them, repacks the masks and closes the door following the manufacturers job task card instructions.

The maintenance record is then signed by a licensed Airframe and Powerplant mechanic in the U.S. – or the overseas equivalent, attesting that the procedure has been done in accordance with the instructions. 

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