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Supplemental oxygen is required above FL100 for the crew after:
A
30 minutes
B
1 hour
C
immediately if above FL125 in EASA operations
D
never required below FL250
C
immediately if above FL125 in EASA operations✓ Correct Answer
Explanation
Under EASA rules, flight crew must use supplemental oxygen above FL100 after 30 min, and continuously above FL125.
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