Canadian Aviation Regulations — 700.240
700.240 (1) An air operator and flight crew members who are exempt under section 700.234 from the application of certain provisions in respect of a flight on the basis of an approved safety case are exempt from the application of the same provisions, on the basis of the same approved safety case, in respect of another flight if (a) the air operator has provided the Minister a letter of confirmation in accordance with subsection (2); (b) the duration of the flight duty period for the other flight is not longer than the duration of the flight duty period of the flight; (c) the number of consecutive flight duty periods for the other flight does not exceed the number of consecutive flight duty periods for the flight; (d) each flight duty period for the other flight starts within 60 minutes of each corresponding flight duty period for the flight; (e) the other flight is conducted in the same time zone or across the same number of time zones in the same direction as the flight and is conducted by flight crew members who are all acclimatized to the same time zone; (f) any part of the flight duty period for the other flight that occurs within the flight crew members’ window of circadian low does not exceed the duration of the flight duty period for the flight that occurs within the flight crew members’ window of circadian low; (g) the other flight is conducted using aircraft of the same type as that used to conduct the flight; (h) the other flight is conducted with the same number of flight crew members on board as the flight; (i) the operating environment of the other flight is similar to the operating environment of the flight; (j) the hazards and risks associated with the other flight are similar to those of the flight; (k) the duration of each rest period before and after each flight duty period associated with the other flight is not shorter than each rest period associated with the flight; (l) the time of day of each rest period of the other flight is similar to the time of day of each rest period of the flight; and (m) the number of consecutive flight duty periods occurring during any part of each flight crew member’s window of circadian low for the other flight does not exceed the number of such consecutive flight duty periods for the flight. (2) The air operator shall provide the Minister a letter of confirmation for the other flight that will be conducted under an exemption referred to in subsection (1) that sets out (a) a description of the other flight that will be subject to the exemption on the basis of the approved safety case; (b) the provisions of these Regulations from which the air operator and flight crew members will be exempt in respect of the other flight; (c) a description of the manner in which the other flight will be conducted results in a variance from the requirements of the provisions referred to in paragraph (b) in respect of the other flight; (d) a statement that the conditions in paragraphs (1)(a) to (m) are met; and (e) the date on which the exemption will apply to the other flight for the first time. (3) An approved safety case in respect of a flight shall not be used for another flight unless (a) the provisions of these Regulations from which the air operator is exempted are the same for all the flights; and (b) the manner in which the flights are conducted results in a variance from the requirements of the provisions referred to in paragraph (a) is the same for all the flights. (4) The exemption referred to in subsection (1) continues to have effect as long as (a) the air operator maintains the fatigue risk management system in accordance with the applicable conditions of this Division; (b) the air operator monitors the effectiveness of the safety case in managing the fatigue and alertness of the flight crew members in accordance with section 700.248 ; and (c) the air operator remedies any adverse effects of the variance on the flight crew members’ levels of fatigue and alertness no later than 60 d