What is Biological Clock?
Biological Clock The natural internal time-keeping system that regulates physiological activities, directly affecting crew alertness and fatigue during time zone changes and long-haul operations.
Source: ICAO Doc 9432, FAA PCG
How is “Biological Clock” Used in Practice?
Crew duty times are scheduled in accordance with biological clock considerations to minimize fatigue and optimize alertness.
Certification Exam Relevance
Who Needs to Know This Term?
- Pilots
- Air Traffic Controllers
- Cabin Crew
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What is Biological Clock?
The natural internal time-keeping system that regulates physiological activities, directly affecting crew alertness and fatigue during time zone changes and long-haul operations.
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