We’re still collecting data for this aircraft. Routes appear once we’ve seen it fly enough times.
The manufacturer's failure to provide inspection criteria for the BPSU compartment aileron control pulleys, which resulted in eventual pulley corrosion, and subsequent control stiffness when seized pulleys and water-soaked aileron cables froze together at altitude. Factors included leaking BPSU bay access panel seals, precipitation, and freezing temperatures.
Bombardier CL600-2B19