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During mustering activities the aircraft was operating between 50 and 80 feet above the ground, when the engine suddenly stopped. The wind at the time was a quartering tailwind, and during the attempted autorotation the aircraft struck the ground in a tail-low attitude. The tail boom was severed, the aircraft bounced, spun to the right and came to rest with the landing skids collapsed. An inspection of the engine revealed that the magneto idler shaft had sheared due to overload caused by foreign objects fouling the magneto drives. The foreign objects were identified as crankshaft flange bolts which had been incorrectly torqued at overhaul.

Download Final Report
[ Download PDF: 22KB]
General details
Date: 11 July 1986 Investigation status: Completed 
Time: 1000 Investigation type: Occurrence Investigation 
Location:20 km SE Old Delamere  
State: Northern Territory  
Release date: 15 June 1987 Occurrence category: Accident 
Report status: Final Highest injury level: None 
Aircraft details
Aircraft manufacturer: Bell Helicopter Co 
Aircraft model: 47 
Aircraft registration: VH-LEF 
Type of operation: Aerial Work 
Sector: Helicopter 
Damage to aircraft: Substantial 
Departure point:Old Delamere NT
Departure time:1000
Destination:Old Delamere NT
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