Narrative:

I am not sure why the aircraft suddenly turned to the right and why the rudder pedal steering or nosewheel steering could not correct it. We were intending to make a turn-off further down the runway because there were aircraft on the taxiway lining up for departures for runway 9L because they had just switched over to east operations. So we were not using brakes at that point because we were planning to turn-off to the left further down the runway. After landing on runway 9R (first officer's landing) slowing through about 90 KTS; he stowed both reversers. Slowing through about 60 KTS we exchanged control of the aircraft. Shortly after that (about 5 seconds); the aircraft took a hard right turn. I tried to correct it with both rudder pedal and nosewheel steering but neither were effective. The right main gear and nosewheel left the runway surface briefly until I was able to regain control of the aircraft and I brought it back onto the runway to a stop. I then was able to taxi off the runway and to the gate. We were not sure what had happened. We told tower that we could have possibly blown a tire. At the gate; maintenance checked the main gear and found traces of dirt on the right main gear and nosewheel. Callback conversation with reporter revealed the following information: the reporter stated that maintenance determined that some type of brake system fault was the most probable cause of the loss of directional control; although it appears maintenance was unable to specifically identify the fault.

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Original NASA ASRS Text

Title: AN A320 FLT CREW REPORTS THAT ON AFTER LANDING ROLLOUT THE AIRCRAFT MADE AN UNCOMMANDED RIGHT TURN; LEAVING THE RUNWAY BRIEFLY BEFORE THEY COULD REGAIN CONTROL.

Narrative: I AM NOT SURE WHY THE ACFT SUDDENLY TURNED TO THE R AND WHY THE RUDDER PEDAL STEERING OR NOSEWHEEL STEERING COULD NOT CORRECT IT. WE WERE INTENDING TO MAKE A TURN-OFF FURTHER DOWN THE RWY BECAUSE THERE WERE ACFT ON THE TXWY LINING UP FOR DEPS FOR RWY 9L BECAUSE THEY HAD JUST SWITCHED OVER TO E OPS. SO WE WERE NOT USING BRAKES AT THAT POINT BECAUSE WE WERE PLANNING TO TURN-OFF TO THE L FURTHER DOWN THE RWY. AFTER LNDG ON RWY 9R (FO'S LNDG) SLOWING THROUGH ABOUT 90 KTS; HE STOWED BOTH REVERSERS. SLOWING THROUGH ABOUT 60 KTS WE EXCHANGED CTL OF THE ACFT. SHORTLY AFTER THAT (ABOUT 5 SECONDS); THE ACFT TOOK A HARD R TURN. I TRIED TO CORRECT IT WITH BOTH RUDDER PEDAL AND NOSEWHEEL STEERING BUT NEITHER WERE EFFECTIVE. THE R MAIN GEAR AND NOSEWHEEL LEFT THE RWY SURFACE BRIEFLY UNTIL I WAS ABLE TO REGAIN CTL OF THE ACFT AND I BROUGHT IT BACK ONTO THE RWY TO A STOP. I THEN WAS ABLE TO TAXI OFF THE RWY AND TO THE GATE. WE WERE NOT SURE WHAT HAD HAPPENED. WE TOLD TWR THAT WE COULD HAVE POSSIBLY BLOWN A TIRE. AT THE GATE; MAINT CHKED THE MAIN GEAR AND FOUND TRACES OF DIRT ON THE R MAIN GEAR AND NOSEWHEEL. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE REPORTER STATED THAT MAINTENANCE DETERMINED THAT SOME TYPE OF BRAKE SYSTEM FAULT WAS THE MOST PROBABLE CAUSE OF THE LOSS OF DIRECTIONAL CONTROL; ALTHOUGH IT APPEARS MAINTENANCE WAS UNABLE TO SPECIFICALLY IDENTIFY THE FAULT.

Data retrieved from NASA's ASRS site as of January 2009 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.