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The aircraft was on its first flight at the time of the accident. All engine parameters had been normal during extensive ground testing and immediately prior to takeoff. The aircraft was in a turn at 600 feet after takeoff when the engine began to run roughly. The pilot commenced an approach for a forced landing in a paddock which appeared to be suitable. However, just prior to touchdown he observed a ditch running across the paddock. He attempted to clear the ditch, by raising the nose, but the right wing dropped. The right mainwheel struck the ground and was torn off, causing the aircraft to settle into the ditch and overturn. An inspection of the engine indicated that some of the cylinder head retaining bolts were not torqued correctly. In addition, the spark plug in the left rear cylinder had been inserted with a crossed thread and was not seating correctly. The centre electrode of this plug has been destroyed. There was damage to both the cylinder head and the exhaust valve seat and there were indications that combustion gases had been blowing past the poorly seated spark plug and the closed exhaust valve. Ceramic deposits, from the missing electrode, were found in the cylinder and the exhaust port. The engine had been purchased and installed as a correctly certified zero time unit, although the spark plugs had been removed and replaced prior to the flight.

Download Final Report
[ Download PDF: 23KB]
 
 
 
 
General details
Date: 08 April 1990 Investigation status: Completed 
Time: 1157 Investigation type: Occurrence Investigation 
Location   (show map):3km N Serpentine Airfield  
State: Western Australia  
Release date: 03 July 1990 Occurrence category: Accident 
Report status: Final Highest injury level: Minor 
 
Aircraft details
Aircraft manufacturer: Rand Kar 
Aircraft model: KR-2 
Aircraft registration: VH-CVA 
Serial number: N110 
Type of operation: Private 
Damage to aircraft: Substantial 
Departure point:Serpentine WA
Departure time:1155
Destination:Serpentine WA
 
 
 
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