Canadian Aviation Regulations

705.69 (1) When icing conditions are reported to exist or are forecast to be encountered along the route of flight, no person shall authorize a flight or its continuation or conduct a take-off or continue a flight in an aircraft, even if the pilot-in-command determines that the aircraft is adequately equipped to operate in icing conditions in accordance with paragraph 605.30(a), if, in the opinion of the pilot-in-command, the safety of the flight might be adversely affected.

(2) No person shall operate an aeroplane in icing conditions at night unless the aeroplane is equipped with a means to illuminate or otherwise detect the formation of ice.