B737 Undifferentiated or Other Model
Flight Crew Last 90 Days 150; Flight Crew Total 21200; Flight Crew Type 4000
Confusion
Aircraft Equipment Problem Critical; Ground Event / Encounter Other / Unknown
General Maintenance Action
Aircraft
After parking at the gate; very shortly after shutting down the left engine (the right engine had been shutdown during taxi in) and receiving the release brakes signal from the ramp agent; I felt the aircraft move laterally a small amount. Somebody from the ramp soon appeared in the cockpit and asked me to come downstairs and take a look at something. I was a bit stunned at what I saw. The nose gear had turned 25-30 degrees to the left; moving the fore and aft chocks around. At the same time a Ramp Agent was attempting to insert the steering bypass pin. I was told he quite luckily was not injured. I made a logbook entry about uncommanded nose gear movement.
A B737's nose wheels turned an uncommanded 25-30 degrees as the Ramp Agent was installing the nose wheel bypass pin following aircraft shut down at the arrival gate.