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The aircraft was being operated on a VFR flight and was cruising at 1500 feet above ground level. The engine suddenly began to run roughly and the rpm dropped to about half the normal setting. Emergency trouble checks failed to alleviate the problem and the pilot transmitted a Mayday call as he tracked towards a nearby strip for a precautionary landing. The approach to this strip was too high and power was applied in an attempt to go around. However, severe engine vibration occurred and the pilot was committed to a forced landing in densely forested, hilly terrain. The power loss and vibration was caused by partial separation of the exhaust valve head on one of the cylinders.

Download Final Report
[ Download PDF: 22KB]
General details
Date: 02 January 1986 Investigation status: Completed 
Time: 1020  
Location:Agnes Waters (80 km NW Bundaberg) Investigation type: Occurrence Investigation 
State: Queensland  
Release date: 25 February 1986  
Report status: Final Occurrence category: Accident 
 Highest injury level: Minor 
Aircraft details
Aircraft manufacturer: Cessna Aircraft Company 
Aircraft model: 172 
Aircraft registration: VH-UJS 
Type of operation: Private 
Damage to aircraft: Substantial 
Departure point:Archerfield QLD
Departure time:1020
Destination:Great Keppel Island QLD
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