NTSB Identification: LAX82FA061
14 CFR Part 133: Rotorcraft Ext. Load
Accident occurred Wednesday, January 27, 1982 in LAGUNITAS, CA
Probable Cause Approval Date: 01/27/1983
Aircraft: BELL UH1B, registration: N96142
Injuries: 1 Fatal.

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.

HELICOPTER CRASHED INTO A RESERVOIR AND SANK IN 60 FEET OF WATER AFTER TAIL BOOM SEPARATED DURING A LOG SLINGING OPERATION. THE PILOT HAD LIFTED AND BEGAN TO BACK UP WHEN A LOUD NOISE WAS HEARD AND THE TAIL SEPARATED. THE LOG WAS RELEASED AND AN AUTO-ROTATION WAS INITIATED. THE AIRCRAFT SANK UPON WATER CONTACT. EXTENSIVE FATIGUE CRACKING IN THE SKIN, AND FRETTING AND LOOSE RIVETS IN THE TAILBOOM WERE FOUND.

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

MISC ROTORCRAFT,TAIL BOOM..FATIGUE

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

MISC ROTORCRAFT,TAIL BOOM..FAILURE,TOTAL

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

MISC ROTORCRAFT,TAIL BOOM..SEPARATION


Contributing Factors

MAINTENANCE,INSPECTION..INADEQUATE


Contributing Factors

AIRCRAFT PREFLIGHT..INADEQUATE..PILOT IN COMMAND

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