NONE · Boeing B-737-201 · 1996-06-10 · RICHMOND, VA, USA
Event
NTSB number
DCA96IA061
Event ID
20001208X05950
Type
Incident
Date
1996-06-10
Location
RICHMOND, VA, USA
Coordinates
37.440887, -77.320114
Injuries
Highest injury
NONE
Fatal
0
Serious
0
Minor
0
Uninjured
53
Total aboard
53
Aircraft
Make
Boeing
Model
B-737-201
Registration
N221US
FAR Part
121
Engines
—
Damage
—
Conditions
Light
NR
Weather
VMC
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.