PSTAR Practice Test · Question
Without supplemental oxygen, the risk of hypoxia in a healthy pilot generally begins to be significant above approximately:
Hypoxia risk becomes significant above ~10,000 ft; CARs require oxygen for flight crew after 30 minutes between 10,000-13,000 ft cabin altitude and at all times
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Question: Without supplemental oxygen, the risk of hypoxia in a healthy pilot generally begins to be significant above approximately:
Answer options:
- 5,000 ft
- 8,000 ft ✅ 10,000 ft
- 18,000 ft
Correct answer: 10,000 ft
Explanation: Hypoxia risk becomes significant above ~10,000 ft; CARs require oxygen for flight crew after 30 minutes between 10,000-13,000 ft cabin altitude and at all times above 13,000 ft.
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- Within a control zone, what is the minimum flight visibility for VFR flight by day?
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