Aviation safety investigations & reports

Cessna 172N, VH-UWD, Tebin Station 32km SSW of Quilpie QLD, 22 November 1985

Investigation number:
Status: Completed
Investigation completed


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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    
State: Queensland    
Release date: 23 April 1986   Occurrence category: Accident  
Report status: Final   Highest injury level: None  

Aircraft details

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