Transport Canada 2019-29

Mandates incorporation of airplane flight manual procedures that will bring “crew workload to an acceptable level” during a multifunction spoiler (MFS) jam scenario. Prompted by an incident where a crew received a “SPOILER FAIL” message and had difficulties maintaining roll control of the aircraft. “They followed the quick reference handbook procedure for the 'SPOILER FAIL' message, however, the aircraft experienced a heavy right-wing-down roll moment when reducing speed to Vref+8 knots,” Transport Canada said. “Post-incident investigation revealed that uncommanded deployment of the MFS at certain positions, in combination with specific flap positions and airspeeds, can create an unacceptably high crew workload in maintaining roll control of the airplane.”