Accident Details
Date
Tuesday, July 28, 1992
NTSB Number
LAX92LA319
Location
HAYFORK, CA
Event ID
20001211X15211
Coordinates
40.500545, -123.189910
Aircraft Damage
Substantial
Highest Injury
Minor
Fatalities
0
Serious Injuries
0
Minor Injuries
1
Uninjured
0
Total Aboard
1
Probable Cause and Findings
THE FAILURE OF THE MAIN ROTOR DRIVE SHAFT DUE TO THE IMPROPER INSTALLATION BY COMPANY MAINTENANCE PERSONNEL OF AN 'O' RING SEAL, WHICH ALLOWED THE PACKING GREASE TO ESCAPE AND CAUSED THE OVER TEMPERATURE FAILURE OF THE DRIVE SHAFT. A FACTOR IN THE ACCIDENT WAS THE LACK OF SUITABLE TERRAIN IN WHICH TO PERFORM AN AUTOROTATION.
Aircraft Information
Registration
N89NW
Make
BELL
Serial Number
62-4576
Engine Type
Turbo-shaft
Data Source
Data provided by the National Transportation Safety Board (NTSB). For more information on this event, visit the NTSB Records Search website. NTSB# LAX92LA319