PLT438 ATPIF EITHER PILOT OF AN AIR CARRIER AIRPLANE LEAVES THE D...

249. PLT438 ATP

If either pilot of an air carrier airplane leaves the duty station while flying at FL 410, the other pilot

A) must have a quick-donning type oxygen mask available.

B) and the flight engineer shall put on their oxygen masks and breath oxygen.

C) shall put on the oxygen mask and breathe oxygen.