Transport Canada CF-2019-04

AD calls for an amendment to the aircraft flight manual procedures, time limits maintenance check change, and eventual installation of a supplemental low-temperature ground wing anti-icing system.  The AD stems from a modification Bombardier developed to prevent takeoff with contaminated wings. This AD, along with actions required by ADs CF-2005-03 and CF-2008-16R1, completes the actions undertaken by Transport Canada to improve the safety of the Challenger fleet when operated in adverse weather conditions, the agency said.