Flight Crew Air Transport Pilot (ATP)
Aircraft Equipment Problem Less Severe
Flight Crew Overcame Equipment Problem; General Maintenance Action
Aircraft
Cat II autoland winds 140/05. 3 autopilots on landing nose wheel touch down speed brake moved forward to disconnect autobrakes and engage manual braking and rudder went hard over to the right. Aircraft still on centerline. Brakes and nose wheel steering worked. Clear runway and came to a stop.  5 minutes after stopping rudder unfroze and everything worked.  Auto pilot also disconnected at that time.[Maintenance inspection notes]: inspected no status messages or [maintenance messages]. Performed a visual inspection of rudder no discrepancies noted. Also performed test of rudder control system. Rudder grd test good with full deflection left and right returning to neutral.  Indication agreed with all rudder movement. Engaged l; r and c  [autopilots] one at a time to look for rudder movement. No rudder deflection occurred. All 3 [autopilot] engagements and disengagements grd check good. No history and no faults Found rudder system grd checks good ok to continue.After clearing the runway and brakes set; I had the First Officer (FO) put his feet on the rudder pedals to see if he could move the rudder; he could not. I then called maintenance; while on the taxiway to see what they wanted to do. While waiting for the Ramp office to get maintenance on the radio the rudder and trim went back to normal operation and we taxied to the gate. I called the Duty Officer and explained the situation and ask to be connected to Tech Support; I explained the situation. Maintenance found no Fault codes and ran ground check on the Hydraulic and Autopilot System. Systems checked fine. (Maintenance was not able to check all three Autopilots engaged in the chocks)After talking with the FO we decided that we were comfortable flying the plane back. FO hand flew the aircraft to FL340; trimmed the aircraft for level flight and then engaged the right autopilot. The autopilot function correctly throughout the remainder of the flight. Landing was hand flown to a normal landing.Not sure as to what caused the situation.
A B757 Crew on a Category II landing rollout experiences a rudder handover to the right as the nose wheel is lowered to the runway. No fault codes were shown and the rudder checked out OK on the ground.