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At about 200 feet agl after take-off, the engine began to vibrate and lose power. The pilot turned the aircraft to the right to position over more suitable terrain. The aircraft was stalled into small trees and bushes before touching down heavily on the nosewheel, which broke off. The aircraft then overturned and came to rest inverted. The power loss was caused by two engine exhaust valves sticking open. Although the valves were found to have been set at the minimum recommended clearance, a build up of combustion residue was present which probably restricted valve movement. Operations in high ambient temperatures involving slow flight and reduced engine cooling at rich mixtures can promote a combustion residue build up reducing valve guide clearance and resulting in valve sticking. The aircraft had been operating in the western Queensland summer conducting sheep survey operations.

Download Final Report
[ Download PDF: 22KB]
General details
Date: 22 November 1985 Investigation status: Completed 
Time: 1029 [Aprx]  
Location:Tebin Station 32km SSW of Quilpie Investigation type: Occurrence Investigation 
State: Queensland  
Release date: 23 April 1986  
Report status: Final Occurrence category: Accident 
 Highest injury level: None 
Aircraft details
Aircraft manufacturer: Cessna Aircraft Company 
Aircraft model: 172 
Aircraft registration: VH-UWD 
Type of operation: Business 
Damage to aircraft: Substantial 
Departure point:Tebin Station QLD
Departure time:1029 [Aprx]
Destination:Quilpie QLD
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