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1052
A passenger aircraft is cruising at FL 290 and all flight crewmember stations are provided with approved quick-donning type oxygen masks. Under which conditions must a flight crewmember put on and use an oxygen mask?
| | A) When the flight engineer leaves the flight engineer station, one pilot must use a mask. |
| | B) When any flight crewmember leaves the flight deck, all other flight crewmembers must use their masks. |
| | C) When one pilot leaves the flight deck, the other pilot must use a mask but other crewmembers need not. |
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