NTSB Identification: DEN90LA105.
The docket is stored on NTSB microfiche number 41531.
Accident occurred Sunday, May 06, 1990 in HELENA, MT
Probable Cause Approval Date: 09/15/1992
Aircraft: CESSNA C-180E, registration: N8679X
Injuries: 2 Uninjured.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

THE COMMERCIAL PILOT WAS MAKING HIS FOURTH LANDING OF THE MORNING. THE AIRCRAFT TOUCHED DOWN ON THE MAIN LANDING GEAR AS PLANNED AND THEN HE LET THE TAIL WHEEL TOUCH DOWN ON THE RUNWAY. HE IMMEDIATELY FELT A VIBRATION AND HE LIFTED THE TAIL WHEEL BACK OFF OF THE RUNWAY. AFTER THE TAIL WHEEL CAME OFF THE RUNWAY HE LOST CONTROL OF THE AIRCRAFT AND IT GROUND-LOOPED. THE INVESTIGATION REVEALED THAT THE TAIL WHEEL BEARING AND PIVOT WAS WORN. IN ADDITION, THE RIGHT RUDDER BRAKE PEDAL RETURN SPRING WAS FOUND SEPARATED FROM THE ATTACHMENT BRACKET.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

THE MALFUNCTION OF THE TAIL WHEEL ASSEMBLY.

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