Aviation safety investigations & reports

Forced/precautionary landing involving a Beech Aircraft Corp C23, VH-UMK, Rose Hill Racecourse, NSW on 23 July 1995

Investigation number:
Status: Completed
Investigation completed


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Whilst transiting the lane of entry outbound to Cessnock the pilot reported that the engine started to vibrate. The aircraft was turned onto a reciprocal heading to return to Hoxton Park but the engine began to run roughly. The use of carburettor heat had no effect, and engine RPM began to decrease. The pilot elected to carry out a forced landing on a race course, but during the landing roll the aircraft collided with a barrier fence. Investigation later revealed that all spark plugs were in poor condition, with heavy erosion to the centre electrodes indicating considerable operating time. Both plugs in number 1 cylinder had broken ceramics and the electrode gaps were closed. One plug in number 4 cylinder was fouled with lead. An engine run later confirmed that the inlet valves in number 3 and 4 cylinders were also sticking.
Download Final Report
[Download  PDF: 12KB]
General details
Date: 23 July 1995   Investigation status: Completed  
Time: 13:20 EST    
State: New South Wales   Occurrence type: Forced/precautionary landing  
Release date: 28 August 1995   Occurrence category: Accident  
Report status: Final    

Aircraft details

Aircraft details
Aircraft manufacturer Beech Aircraft Corp  
Aircraft model C23  
Aircraft registration VH-UMK  
Sector Piston  
Damage to aircraft Substantial  
Departure point Hoxton Park NSW  
Destination Cessnock NSW