Although not required, supplemental oxygen is recommended for use when flying at night above
A
5,000 feet.✓ Correct Answer
B
10,000 feet.
C
12,500 feet.
Explanation
AIM 8-1-2 notes that night vision is significantly impaired as low as 5,000 feet because of reduced oxygen and recommends supplemental oxygen above 5,000 feet at night. 10,000 and 12,500 feet relate to daytime recommendations and regulatory requirements.
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