Aviation safety investigations & reports

Bell 47-G5, VH-AEO, 42 km NNW of Strathmore Station QLD, 27 May 1985

Investigation number:
Status: Completed
Investigation completed


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While flying at a slow forward speed approximately 15 feet above the trees, the helicopter suddenly yawed to the right. As the pilot was unable to correct the yaw he attempted to manoeuvre the helicopter to a clear area. The helicopter impacted the ground in a level attitude, heading rearward and rotating. Investigation revealed that all the teeth were missing from the forward short shaft rear coupling, which had failed due to lack of lubrication, and resulted in a loss of tail rotor propulsion. The coupling, which was covered by a rubber dust boot, had not received adequate daily inspections to ensure that it contained sufficient grease and was free of excessive play.

Download Final Report
[Download  PDF: 22KB]
General details
Date: 27 May 1985   Investigation status: Completed  
Time: 1020    
Location: 42 km NNW of Strathmore Station    
State: Queensland    
Release date: 20 August 1985   Occurrence category: Accident  
Report status: Final   Highest injury level: None  

Aircraft details

Aircraft details
Aircraft manufacturer Bell Helicopter Co  
Aircraft model 47  
Aircraft registration VH-AEO  
Type of operation Aerial Work  
Sector Helicopter  
Damage to aircraft Substantial  
Departure point 148 km East of Normanton QLD  
Departure time 1020  
Destination 148 km East of Normanton QLD