NTSB Identification: MKC85FA189.
The docket is stored on NTSB microfiche number 28507.
Accident occurred Saturday, August 17, 1985 in SEDALIA, MO
Aircraft: BELL 47G-2A, registration: N3951U
Injuries: 1 Serious,2 Uninjured.

NTSB investigators either traveled in support of this investigation or conducted a significant amount of investigative work without any travel, and used data obtained from various sources to prepare this aircraft accident report.

THE PLT WAS TAKING 2 PASSENGERS ON A HELICOPTER RIDE AT A FAIR. IMMEDIATELY AFTER LIFT-OFF, HE ENCOUNTERED A SITUATION WHERE HE WAS UNABLE TO MAINTAIN DIRECTIONAL CONTROL, SO HE REDUCED POWER & LANDED. BEFORE COMING TO REST, THE TAIL OF THE HELICOPTER STRUCK A VAN. AN INVESTIGATION REVEALED THAT THE INNER BEARING (PN 47-620-605-001) OF THE TAIL ROTOR DRIVE HAD FAILED, THEN THE DRIVE SHAFT FAILED. AD 81-04-03, AMENDMENT 39-4029 BECAME EFFECTIVE ON 2/2/81 TO REPLACE THE BEARING IN THE NEXT 600 HRS OF SERVICE. HOWEVER, THE HELICOPTER HAD ACCUMULATED LESS THAN 600 HRS SINCE THAT DATE.

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

ROTOR DRIVE SYSTEM,TAIL ROTOR DRIVE SHAFT BEARING..FAILURE,TOTAL


Contributing Factors

OBJECT..VEHICLE

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