Narrative:

The PF took off for ZZZ. All phases of flight were normal. All checklists were used. En route we heard 2 other aircraft takeoff off ZZZ. We then asked the winds and conditions at ZZZ; they responded as saying 'all right.' a company aircraft landed a few mins ahead of us with no problems. We overflew the field and confirm to land on runway xx. We did the before landing check. On final we observed that the wind had moved to a right quartering tailwind. The PF applied the right amount of aileron and rudder to maintain centerline. The rest of the approach was normal. Shortly after touchdown the aircraft started to go to the left. The PF applied first right rudder then right brake. However the aircraft continued to drive off the dirt runway. We hop over a small ditch which cause the plane to turn to the left. The plane now parallel runway xx. After a few 100 ft the plane slowed to a stop. We shut down the plane and deplaned the passenger. Afterwards; we both walked the aircraft's track and noticed that the nosewheel was wider and more pronounced than both of the main wheels. Also; there was grooves and tire marks. We both believed that the nosewheel of the aircraft was not centered on touchdown. Even though we confirmed that the tiller was. Callback conversation with reporter revealed the following information: the crew could find no problem with the nosewheel during postflt inspection. Maintenance determined no problems with the aircraft. The reported quartering tailwind was estimated to be more than 8 KTS.

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Original NASA ASRS Text

Title: RWY EXCURSION FROM A DIRT RWY IN A DHC6-300.

Narrative: THE PF TOOK OFF FOR ZZZ. ALL PHASES OF FLT WERE NORMAL. ALL CHKLISTS WERE USED. ENRTE WE HEARD 2 OTHER ACFT TKOF OFF ZZZ. WE THEN ASKED THE WINDS AND CONDITIONS AT ZZZ; THEY RESPONDED AS SAYING 'ALL RIGHT.' A COMPANY ACFT LANDED A FEW MINS AHEAD OF US WITH NO PROBS. WE OVERFLEW THE FIELD AND CONFIRM TO LAND ON RWY XX. WE DID THE BEFORE LNDG CHK. ON FINAL WE OBSERVED THAT THE WIND HAD MOVED TO A R QUARTERING TAILWIND. THE PF APPLIED THE RIGHT AMOUNT OF AILERON AND RUDDER TO MAINTAIN CTRLINE. THE REST OF THE APCH WAS NORMAL. SHORTLY AFTER TOUCHDOWN THE ACFT STARTED TO GO TO THE L. THE PF APPLIED FIRST R RUDDER THEN R BRAKE. HOWEVER THE ACFT CONTINUED TO DRIVE OFF THE DIRT RWY. WE HOP OVER A SMALL DITCH WHICH CAUSE THE PLANE TO TURN TO THE L. THE PLANE NOW PARALLEL RWY XX. AFTER A FEW 100 FT THE PLANE SLOWED TO A STOP. WE SHUT DOWN THE PLANE AND DEPLANED THE PAX. AFTERWARDS; WE BOTH WALKED THE ACFT'S TRACK AND NOTICED THAT THE NOSEWHEEL WAS WIDER AND MORE PRONOUNCED THAN BOTH OF THE MAIN WHEELS. ALSO; THERE WAS GROOVES AND TIRE MARKS. WE BOTH BELIEVED THAT THE NOSEWHEEL OF THE ACFT WAS NOT CTRED ON TOUCHDOWN. EVEN THOUGH WE CONFIRMED THAT THE TILLER WAS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE CREW COULD FIND NO PROB WITH THE NOSEWHEEL DURING POSTFLT INSPECTION. MAINT DETERMINED NO PROBS WITH THE ACFT. THE RPTED QUARTERING TAILWIND WAS ESTIMATED TO BE MORE THAN 8 KTS.

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.