Canadian Aviation Regulations · SOR/96-433
Long-Range Flights
If any part of your flight duty period is in the window of circadian low, you can't be assigned a flight that follows a scheduled flight of more than seven hours — not without a Fatigue Risk Management System.
Applies to 703704705 · in force since December 12, 2020
Section 700.61 in full: “An air operator shall not assign a flight duty period to a flight crew member, and a flight crew member shall not accept such an assignment, if the flight duty period occurs within the member’s window of circadian low and includes a flight that follows a scheduled flight of more than seven hours.”
In other words: if any part of the FDP is in your window of circadian low (02:00–05:59 acclimatized), you can’t fly a second leg after a scheduled first leg longer than seven hours.
The AC adds that this applies to un-augmented flight crews, and that operating a >7-hour flight plus another WOCL-infringing flight with the same crew would need a Fatigue Risk Management System (AC 700-047 § 4.67). All duty — including positioning and dead-heading — counts toward the duty period.
Related
- Augmented crew (700.60)
- Ultra-long-range flights (700.62)
- A Fatigue Risk Management System (CARs 700.200 series) is the route to exceeding a prescriptive limit like this one.
What changed in 2018
In plain language
New with the 2018 rules: a limit on stacking a second flight after a long first flight when the duty period runs through the body-clock low.
Paraphrased from Advisory Circular 700-047 .