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The glider was undergoing a test flight following an annual inspection. After being released the aircraft was climbed to 4300 feet prior to the commencement of a high speed descent. At an indicated airspeed of 110 knots the pilot reported that there was a slight buffet from the tailplane area. The descent was continued and at an indicated airspeed between 118 and 122 knots severe vibrations from the tailplane area were encountered. The airspeed was reduced and after completing a control check the aircraft was landed. Subsequent inspection revealed damage to the rear fuselage near the fin root. This accident was investigated by the Gliding Federation of Australia and was not the subject of an on-site investigation by the Bureau. The Federation's investigation indicated that the amount of freeplay in the horizontal tailplane of the aircraft was just within the limits specified in the manufacturer's manual the pilot was inexperienced for the task he may have actually reached VNE and his reaction to the vibration may have overstressed the aircraft.

Download Final Report
[ Download PDF: 23KB]
 
 
 
 
General details
Date: 29 December 1987 Investigation status: Completed 
Time: 1400 Investigation type: Occurrence Investigation 
Location:3 km E of Tumut Occurrence type:Airframe - Other 
State: New South Wales Occurrence class: Technical 
Release date: 29 June 1989 Occurrence category: Accident 
Report status: Final Highest injury level: None 
 
Aircraft details
Aircraft manufacturer: Pilatus Aircraft Ltd 
Aircraft model: PC-11 
Aircraft registration: VH-GCF 
Serial number: N/K 
Type of operation: Gliding 
Damage to aircraft: Substantial 
Departure point:Tumut NSW
Departure time:1330
Destination:Tumut NSW
 
 
 
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