Incident
A Douglas MD82 experienced a flight control malfunction after takeoff, prompting a diversion to Dulles International Airport. The flight crew reported a loss of the autopilot and in-flight kicks on the rudder. On the ground, the rudder tab was observed moving uncommanded.
Investigation
Following the incident, the Yaw Damper Actuator, Digital Flight Guidance Computer, and Dual Axis Accelerometer were removed from the aircraft for further testing. The Yaw Damper Actuator and the Digital Flight Guidance Computer passed their respective tests. The Dual Axis Accelerometer was bench tested at the avionics test center using test manual #22-19-01, Rev 1. The unit failed the initial test. After a metal sliver imbedded in the pins was removed, the unit failed a second test.