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While wheel taxying for take-off minor ground resonance occurred. The pilot lifted the helicopter off the ground and the resonance ceased. Severe main rotor vibration started and the pilot landed the helicopter. Ground resonance then began with one main rotor blade striking the cabin roof and severing the tailboom. The helicopter then turned through 180 degrees as it sustained further damage. Inflight main rotor imbalance was caused by the failure of a blade damper. The failure resulted from the seat displacement of a one-way valve by a portion of perforated plate. Blade imbalance then induced the failure of a main rotor spacer cable. Loss of control necessitated a landing and severe ground resonance induced by blade imbalance resulted.

Download Final Report
[ Download PDF: 22KB]
General details
Date: 17 June 1981 Investigation status: Completed 
Time: 943  
Location:Gladstone Investigation type: Occurrence Investigation 
State: Queensland Occurrence type: Airframe - Other 
Release date: 22 March 1984 Occurrence class: Technical 
Report status: Final Occurrence category: Accident 
 Highest injury level: Minor 
Aircraft details
Aircraft manufacturer: Aerospatiale Industries 
Aircraft model: SA319 
Aircraft registration: VH-FLH 
Type of operation: Charter 
Sector: Helicopter 
Damage to aircraft: Substantial 
Departure point:Gladstone QLD
Departure time:0943
Destination:Heron Island QLD
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Last update 16 November 2015