For private aircraft operating in the US, the crew is required to use – McqOptions

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1.	For private aircraft operating in the US, the crew is required to use oxygen masks if the cabin altitude stays above __________ for more than 30 minutes.
A.	12,000 feet
B.	50,000 feet
C.	25,000 feet
D.	20,000 feet
Answer» B. 50,000 feet

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