CAO 48
OK, here's the..let's continue..clause
3.8 Provided the provisions of section 48.0, subsection 1 are observed, a tour of duty, commenced in accordance with paragraph 3.5 of this subsection, may be extended at the discretion of the pilot in command as follows:
(a) turbo-jet aircraft, 20 hours
and here's the..got ya..clause!
1.4 Notwithstanding anything contained in these Orders, a flight crew member shall not fly, and an operator shall not require that person to fly if either the flight crew member is suffering from, or, considering the circumstances of the particular flight to be undertaken, is likely to suffer from, fatigue or illness which may affect judgement or performance to the extent that safety may be impaired.