'Acclimatisation' is the process of adjusting one's circadian rhythms after moving across time zones.
Operators and pilots complying with Appendix 2 - multi-crew public transport operations (complex) must be able to determine a state of acclimatisation in order to determine the maximum flight duty period and minimum off-duty periods for a pilot.
While appendices 4 (single-pilot public transport operations) and 5 (aerial work operations other than flying training) do not talk about the impact of crossing time zones, the likelihood of increased fatigue risk from doing so must be managed.
The responsibility of managing the effects of time-zone changes is the responsibility of both the operator and the pilot. The operator must provide adequate fatigue training and the pilot must apply this training to decide whether they are fit for duty. An operator must not require a pilot to commence duty if they are unfit to do so.
Read more about acclimatisation requirements in the Civil Aviation Order 48.1 Instrument 2013 and CAAP 48-1(1): Fatigue management for flight crew members.
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