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While flying at about 500 feet above ground level the aircraft evidently experienced severe vibration, and the inboard half of the right aileron was torn from the wing. The pilot attempted to deploy the parachute system, but the rigging lines wrapped around the propeller shaft. As a result, the parachute canopy did not open, but trailed between the propeller and the tail plane. The aircraft subsequently stalled and spiralled to the ground. When impact occurred, the complete left aileron was seen still falling. It was found 60 metres short of the aircraft impact site and the right aileron was found 148 metres short of the impact site. There is no known technical data available for this prototype aircraft, on which the control surfaces were not mass balanced. The pilot had experienced probable in-flight flutter on an earlier, different ultralight which he had designed and built. He had eliminated the problem by mass balancing the ailerons. An airspeed of about 80 knots could be considered critical for the initiation of flutter of unbalanced control surfaces on ultralight aircraft. From measurements and numbers recorded by the pilot on his map, it was concluded that the aircraft had probably been travelling in excess of this speed. Control surface flutter may have also been induced if some element of the control system had failed or had not been assembled or maintained to minimize flexibility and mechanical tolerances. A detailed inspection of the wreckage has determined that the control rod support lugs on the right aileron control horn may have failed along the weld line. There may also have been torsional flexibility of the aileron and the wing, which could have led to flutter at high speed.

Download Final Report
[ Download PDF: 23KB]
 
 
 
 
General details
Date: 24 June 1988 Investigation status: Completed 
Time: 1605 Investigation type: Occurrence Investigation 
Location:3.5 km SSE of Officer Occurrence type:Airframe - Other 
State: Victoria Occurrence class: Technical 
Release date: 20 February 1989 Occurrence category: Accident 
Report status: Final Highest injury level: Fatal 
 
Aircraft details
Aircraft manufacturer: Unknown 
Aircraft model: Labahn Hitch Hiker XC 
Aircraft registration: Not registered 
Serial number: N/A 
Type of operation: Sports Aviation 
Damage to aircraft: Destroyed 
Departure point:Beaconsfield VIC
Departure time:Unknown
Destination:Beaconsfield VIC
 
 
 
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