Question

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

The question was posed to me in final exam.

My question is from Aircraft Systems and Aviation in chapter Aircraft Systems and Aviation Overview of Aircraft Maintenance

Answer 1

Right answer is (a) 12,000 feet

The explanation: For private aircraft operating in the US, the crew is required to use oxygen masks if the cabin altitude stays above 12,000 feet for more than 30 minutes.