Aviation safety investigations & reports

Grob Twin Astir, VH-KYL, Black Springs (25 km S Burra) SA, 8 June 1987

Investigation number:
Status: Completed
Investigation completed


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The pilot was participating in a "ridge soaring camp". After becoming airborne the glider was flown at low level in a south-westerly direction along the ridge line, about 200 feet above the ridge. The pilot then turned the aircraft left towards the ridge in an attempt to gain lift. No lift was gained and the aircraft descended. The pilot then raised the nose of the aircraft to clear the ridge but the right wing struck a tree. The aircraft slewed to the right and descended down the ridge line before impacting the ground. The pilot had intended to turn back towards the ridge but delayed this turn to allow her passenger to take a photograph. The resultant flight path took the aircraft into an area of sink on the leeward side of the ridge. The pilot usually flew the glider from the front cockpit but due to centre of gravity considerations she had to use the rear cockpit which somewhat restricted her forward vision. The volume of the variometer, which was fitted in the front cockpit, was turned down so as not to disturb the passenger, however this action also deprived the pilot of immediate indication of changes in lift. This accident was not the subject of an on-site investigation.

Download Final Report
[Download  PDF: 22KB]
General details
Date: 08 June 1987   Investigation status: Completed  
Time: 944    
Location: Black Springs (25 km S Burra)    
State: South Australia   Occurrence type: Collision with terrain  
Release date: 19 August 1987   Occurrence category: Accident  
Report status: Final   Highest injury level: Minor  

Aircraft details

Aircraft details
Aircraft manufacturer Grob - Burkhart Flugzeugbau  
Aircraft model G103  
Aircraft registration VH-KYL  
Serial number 3062  
Type of operation Gliding  
Damage to aircraft Substantial  
Departure point Black Springs SA  
Departure time 930  
Destination Black Springs SA