Canadian Aviation Regulations (SOR/96-433)

700.64 (1) In the event of an unforeseen operational circumstance that occurs after the beginning of the flight duty period, an air operator may change a flight crew member’s flight duty period to include a split flight duty in accordance with section 700.50 if the pilot-in-command agrees and the change is made before the scheduled break on the ground.

(2) The pilot-in-command shall not agree to the change if they are of the opinion, after consulting with all other crew members, that a split flight duty period could lead to a level of fatigue that may adversely affect the safety of the flight.