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The pilot was engaged in spreading fertilizer on a forest. The airstrip being used was in a valley and to fly to the area of operation the aircraft had to cross a ridge line. As the aircraft approached the ridge the pilot stated that he noticed that the aircraft was descending, he applied full power and jettisoned the load. However, the stub wing of the aircraft struck some tall trees below the top of the ridge and a short distance later the forward flight of the aircraft was arrested when it collided with a large tree. The aircraft slid down the tree and became wedged between it and two other trees. The pilot was able to evacuate himself from the wreckage and walk to the airstrip. The pilot had taken 19 loads across the ridge line en-route to the treatment area prior to the accident flight. He had been clearing the tree- tops on the ridge by 30-60 feet on each run and planned to do the same this time. However, as the aircraft approached the ridge line the pilot reported that it encountered a downdraught. The presence of downdraughts in the area could not be substantiated by either other pilots or meteorology reports.

Download Final Report
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General details
Date: 04 June 1986 Investigation status: Completed 
Time: 1058  
Location:22km East of Bunbury Investigation type: Occurrence Investigation 
State: Western Australia  
Release date: 17 November 1986  
Report status: Final Occurrence category: Accident 
 Highest injury level: None 
Aircraft details
Aircraft manufacturer: Transavia Corp Pty Ltd 
Aircraft model: PL-12 
Aircraft registration: VH-AGK 
Type of operation: Aerial Work 
Damage to aircraft: Substantial 
Departure point:White's Strip, 24km East of Bunbury WA
Departure time:1058
Destination:White's Strip WA
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