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'Night duty' is a duty period encroaching any portion of the period, in the time zone to which the crew is acclimatised, between…

  • A

    00:30 and 04:30 hours.

  • B

    02:00 and 04:59 hours.

  • C

    01:00 and 05:00 hours.

  • D

    00:00 and 06:00 hours.

Numbers to know for the exam:

  • 02:00 - 04:59 = Night Duty
  • 02:00 - 05:59 = Window Of Circadian Low (WOCL)

EASA AIR OPS
ORO.FTL.105 Definitions

(9) ‘night duty’ means a duty period encroaching any portion of the period between 02:00 and 04:59 in the time zone to which the crew is acclimatised.

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