Inspection of Bombardier Q400 main landing gear has been ordered after line checks uncovered two cases of cam mechanism failure in the gear’s alternate extension system (AES). The cam mechanism operates the cable to open the main landing gear door and releases the MLG uplock in sequence. In cases where an operator must use the alternate extension system to deploy the MLG, the failure of the cam mechanism on one side will lead to an asymmetrical landing configuration.
Bombardier (Boeing Canada/De Havilland) DHC-8 Series Aeroplanes



Porter Airlines flight PD-139 had to divert and make an emergency landing Toronto Pearson International Airport, Canada, on July 1st.
