Canadian Aviation Regulations (SOR/96-433)

700.63 (1) If the pilot-in-command is of the opinion that an unforeseen operational circumstance that occurs within 60 minutes of the beginning of the flight duty period could lead to a level of fatigue that may adversely affect the safety of the flight, the pilot-in-command may, after consulting with all crew members on their level of fatigue,

• (a) reduce a flight crew member’s flight duty period;

• (b) extend a flight crew member’s flight duty period by the following number of hours in excess of the maximum flight duty period set out in section 700.28 or subsection 700.60(1) by

  • (i) one hour for a single-pilot operation,

  • (ii) two hours, if the flight crew is not augmented,

  • (iii) three hours, if the flight crew is augmented and there is one flight during the scheduled flight duty period, and

  • (iv) two hours, if the flight crew is augmented and there are two or three flights during the scheduled flight duty period; or

• (c) extend a flight crew member’s rest period.

(2) If a further unforeseen operational circumstance arises after take-off on the final flight for which the maximum flight duty period was extended under subsection (1), the pilot-in-command may, despite that subsection, continue the flight to the destination aerodrome or to an alternate aerodrome.

(3) An air operator shall extend the rest period after a flight duty period is extended under this section by an amount of time that is at least equal to the extension of the flight duty period.

(4) At the end of a flight duty period, the pilot-in-command shall notify the air operator of any change to a flight duty period made under this section.