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As the helicopter was being hovered the pilots heard a muffled bang. The instructor immediately assumed control and landed the helicopter. An inspection of the transmission area revealed that the rear drive belt was missing. The instructor reboarded the helicopter and commenced to hover taxi back to the hangar. Another bang and other noises were heard emanating from the rear of the helicopter, which was landed and the engine shut down. Substantial damage had been caused to the transmission area. The reason for the initial belt failure was not determine as the belt was not recovered. The remaining belts failed after being overloaded during taxi back to the hangar. It is considered that after the belts failed the actuator continued to run winding itself apart. This resulted in the gross misalignment of the driveshaft and in turn the failure of the flexplate and the damage to the transmission area.

Download Final Report
[ Download PDF: 22KB]
General details
Date: 18 August 1984 Investigation status: Completed 
Time: N/A  
Location:Archerfield Investigation type: Occurrence Investigation 
State: Queensland  
Release date: 16 February 1987  
Report status: Final Occurrence category: Accident 
 Highest injury level: None 
Aircraft details
Aircraft manufacturer: Robinson Helicopter Co 
Aircraft model: R22 
Aircraft registration: VH-IXM 
Type of operation: Flying Training 
Sector: Helicopter 
Damage to aircraft: Substantial 
Departure point:Archerfield QLD
Departure time:N/A
Destination:Archerfield QLD
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Last update 01 April 2011