NTSB Identification: ANC95TA067.
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Accident occurred Friday, June 02, 1995 in SAND POINT, AK
Probable Cause Approval Date: 11/08/1995
Aircraft: PIPER PA-18-150, registration: N125FG
Injuries: 2 Uninjured.
NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this public aircraft accident report.
THE PILOT REPORTED HE HAD LANDED THE 29' TUNDRA TIRE EQUIPPED TAIL WHEEL AIRPLANE ON THE HARD SURFACED RUNWAY AND WAS SLOWING TO TAXI SPEED WHEN THE AIRPLANE SUDDENLY VEERED TO THE RIGHT. HE APPLIED FULL LEFT BRAKE AND RUDDER, BUT WAS UNABLE TO STRAIGHTEN THE AIRPLANE BEFORE THE LEFT MAIN LANDING GEAR COLLAPSED. SUBSEQUENT EXAMINATION OF THE TAILWHEEL STEERING MECHANISM FOUND THE ANTI-CASTORING LIMITS WERE BELOW THE MANUFACTURER'S RECOMMENDED BREAK FREE FORCE, WHICH ALLOWED THE AIRPLANE TO TURN FASTER AND MORE FREELY TO THE RIGHT THAN COMMANDED BY THE RUDDER CONTROL INPUTS. CONVERSATIONS WITH PILOTS WHO HAVE EXTENSIVE EXPERIENCE WITH TUNDRA TIRES DISCLOSED THAT AIRPLANES SO EQUIPPED ARE MUCH MORE DIFFICULT TO HANDLE ON HARD SURFACED RUNWAYS THAN AIRPLANES WITH CONVENTIONAL TIRES.
The National Transportation Safety Board determines the probable cause(s) of this accident to be: The premature castoring of the tailwheel steering mechanism. A factor associated the accident is the added degree of difficulty in handling airplanes equipped with oversize 'tundra' tires. Full narrative available
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