hardhypoxia

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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