Airworthiness Directive · Amendment 39-13534 · Bombardier Model DHC-8-401 and -402 Airplanes
Bombardier Model DHC-8-401 and -402 Airplanes
Model DHC-8-401 and -402 airplanes; certificated in any category; serial numbers 4005, 4006, 4008 through 4016 inclusive, and 4018 through 4058 inclusive.
This amendment adopts a new airworthiness directive (AD), applicable to certain Bombardier Model DHC-8-401 and -402 airplanes, that requires modifying the wiring of the rudder trim switch, inspecting all wiring on the back of the aileron/rudder trim control panel for chafing, and replacing any chafed wiring with new wiring. This action is necessary to prevent a short circuit on the aileron/ rudder trim control panel that could cause a runaway condition of the rudder trim actuator, which could result in reduced controllability of the airplane. This action is intended to address the identified unsafe condition.
