Jun 10, 1996
Incident
RICHMOND, VA
InjuriesNone
Phase of Flight-
ConditionsVMC
OperationFAR 121
Probable Cause
The yaw/roll upset of the airplane resulting from the movement of the rudder surface to its blowdown limit. The rudder surface most likely deflected in a direction opposite to that commanded by the pilots as a result of a jam of the main rudder power control unit servo valve secondary slide to the servo valve housing offset from its neutral position and overtravel of the primary slide.
NTSB DCA96IA061