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After landing, as the pilot lowered the collective lever, the helicopter entered ground resonance. Recovery action was not taken by the pilot and one of the main rotor blades struck a fuel drum. The resulting imbalance of the main rotor system caused the rotor mast to separate from its attachment. An inspection of the helicopter revealed that the undercarriage oleo struts had incorrect and differing inflation levels, and that the main rotor dampers had been incorrectly assembled.

Download Final Report
[ Download PDF: 22KB]
General details
Date: 14 June 1984 Investigation status: Completed 
Time: 1200(Aprx)  
Location:Mt Anderson Homestead, 80km South-east of Derby Investigation type: Occurrence Investigation 
State: Western Australia Occurrence type: Airframe - Other 
Release date: 18 May 1987 Occurrence class: Technical 
Report status: Final Occurrence category: Accident 
 Highest injury level: None 
Aircraft details
Aircraft manufacturer: Hughes Helicopters 
Aircraft model: 269 
Aircraft registration: VH-KZR 
Type of operation: Aerial Work 
Sector: Helicopter 
Damage to aircraft: Substantial 
Departure point:Mt Anderson Homestead WA
Departure time:1200(Aprx)
Destination:Mt Anderson Homestead WA
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Last update 13 May 2014