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The helicopter was engaged in cattle mustering on Ivanhoe Station. The pilot in command was training the other pilot in aerial mustering techniques. While the helicopter was being flown at about 50 feet agl, one main rotor blade grip failed. The associated main rotor blade separated from the helicopter and the resulting imbalance caused the other main rotor blade and transmission to be torn from the helicopter. The aircraft then fell to the ground, landing on its right side. The main rotor blade grip failed due to a combination of fatigue and overload forces. Examination of the aircraft records revealed that because of a error in the recording of component hours, the 5000 hour service life of the grip had been exceeded by 687 hours. During the investigation inspections of the blade grips on several other helicopters were carried out. Fatigue cracking was revealed in a significant number of the blade grips inspected. As a result, the manufacturer of the aircraft has recommended a reduction in the service life of the component.

Download Final Report
[ Download PDF: 22KB]
 
 
 
 
General details
Date: 29 May 1985 Investigation status: Completed 
Time: 900 Investigation type: Occurrence Investigation 
Location:Ivanhoe Station  
State: Western Australia  
Release date: 07 January 1986 Occurrence category: Accident 
Report status: Final Highest injury level: Fatal 
 
Aircraft details
Aircraft manufacturer: Bell Helicopter Co 
Aircraft model: 47 
Aircraft registration: VH-SJY 
Type of operation: Aerial Work 
Sector: Helicopter 
Damage to aircraft: Substantial 
Departure point:Ivanhoe Station WA
Departure time:0900
Destination:Ivanhoe Station WA
 
 
 
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