NTSB Identification: ATL87LA119.
The docket is stored on NTSB microfiche number 33807.
Accident occurred Tuesday, April 21, 1987 in CLARKSVILLE, TN
Probable Cause Approval Date: 05/02/1988
Aircraft: BELL UH-1B, registration: N46884
Injuries: 2 Serious.

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 PILOT LOST TAIL ROTOR CONTROL IN CRUISE FLIGHT AFTER THE TAIL ROTOR DRIVE SHAFT SEPARATED. THE TAIL ROTOR SYSTEM HAD SUSTAINED PREVIOUS DAMAGE ABOUT 4 YEARS PRIOR TO THIS ACCIDENT WHEN, WHILE BEING OPERATED AS A PUBLIC USE AIRCRAFT, THE HELICOPTER SKIDDED OFF A PORTABLE LANDING PAD. THE AIRCRAFT RECORDS SHOWED NO MAINTENANCE OR INSPECTIONS SINCE THAT PREVIOUS DAMAGE TO THE TAIL ROTOR SYSTEM. THE PUBLIC USE AGENCY HAD ELECTED NOT TO REPAIR THE TAIL ROTOR SYSTEM AND SUBSEQUENTLY SOLD THE HELICOPTER TO AN AIRCRAFT DEALER.

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

ROTOR DRIVE SYSTEM,TAIL ROTOR DRIVE SHAFT..SEPARATION

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

MAINTENANCE,MAJOR REPAIR..NOT PERFORMED..COMPANY/OPERATOR MANAGEMENT

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

MAINTENANCE,INSPECTION..DISREGARDED..COMPANY/OPERATOR MANAGEMENT

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

OPERATION WITH KNOWN DEFICIENCIES IN EQUIPMENT..ATTEMPTED..PILOT IN COMMAND

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

PROCEDURES/DIRECTIVES..NOT FOLLOWED..COMPANY/OPERATOR MANAGEMENT

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