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The helicopter took off and entered a hover in ground effect before a climbing turn to the left was initiated from approximately 10 feet above ground level(agl). Immediately the turn was commenced the helicopter started to lose mainrotor rpm. The terrain drops away from the heli-pad and the helicopter was now 35 to 40 feet agl. The pilot attempted to regain rotor rpm by lowering the collective and increasing throttle, however, RPM was not regained and the helicopter continued in the descent until ground impact. The pilot was interviewed by an Examiner of Airmen who was of the opinion that the symptoms described by the pilot indicated that the mainrotor was overpitched during the climbing turn.

Download Final Report
[ Download PDF: 22KB]
 
 
 
 
General details
Date: 15 September 1989 Investigation status: Completed 
Time: 1815 Investigation type: Occurrence Investigation 
Location:Katherine Gorge Occurrence type:Loss of control 
State: Northern Territory Occurrence class: Operational 
Release date: 15 November 1989 Occurrence category: Accident 
Report status: Final Highest injury level: None 
 
Aircraft details
Aircraft manufacturer: Bell Helicopter Co 
Aircraft model: 47 
Aircraft registration: VH-HMU 
Serial number: 3392 
Type of operation: Aerial Work 
Sector: Helicopter 
Damage to aircraft: Substantial 
Departure point:Katherine Gorge NT
Departure time:1815
Destination:Katherine Gorge NT
 
 
 
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