Canadian Aviation Regulations

604.102 (1) Flight duty time may be extended by up to three hours if

• (a) the pilot-in-command, after consultation with the other flight crew members, considers it safe to do so;

• (b) the flight duty time is extended as a result of unforeseen operational circumstances;

• (c) the next minimum rest period is increased by an amount of time that is at least equal to the length of the extension of the flight duty time; and

• (d) the pilot-in-command notifies the private operator of the unforeseen operational circumstances and of the length of the extension of the flight duty time.

(2) The private operator shall retain a copy of the notification for five years.