Airworthiness Directives; Bombardier, Inc., Airplanes

The FAA proposes to adopt a new airworthiness directive (AD) for all Bombardier, Inc., Model BD-100-1A10 airplanes. This proposed AD was prompted by reports of pitch upset upon autopilot disconnect following engine indication and crew alerting system (EICAS) messages that indicated that the autopilot was holding significant nose up or nose down forces on the elevator. This proposed AD would require revising the existing airplane flight manual (AFM) to change the procedure for the AP STAB TRIM FAIL (C) advisory message from a non- normal procedure to an emergency procedure to provide the flightcrew with emergency procedures to follow to stabilize airspeed in certain conditions. The FAA is proposing this AD to address the unsafe condition on these products.