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As the pilot reduced power on reaching cruise altitude, he noticed a vibration through the aircraft. The vibration increased in intensity and the aircraft instruments became difficult to read. The pilot was unable to determine the cause of the vibration and decided to carry out a landing in a paddock. The downwind approach was misjudged and the chosen landing area overshot. The pilot then became concerned about the proximity of the trees at the end of the paddock and attempted to force the aircraft onto the ground. The aircraft struck a tree, then the ground, nosed over and came to rest inverted. During the approach the pilot had not used flap as he had been concerned that the vibration may have been airframe induced. However, inspection of the aircraft did not reveal any contributory airframe fault. Evidence was found that the four exhaust valves had been sticking and given the high ambient temperature, high oil temperature and low oil pressure indications subsequently reported by the pilot, it is probable that the vibration was caused by stuck exhaust valves.

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General details
Date: 09 February 1984 Investigation status: Completed 
Time: 1517  
Location:56 km E of Jandakot Investigation type: Occurrence Investigation 
State: Western Australia  
Release date: 26 July 1984  
Report status: Final Occurrence category: Accident 
 Highest injury level: Serious 
Aircraft details
Aircraft manufacturer: American Aircraft Corp 
Aircraft model: AA-5 
Aircraft registration: VH-WXH 
Type of operation: Private 
Damage to aircraft: Destroyed 
Departure point:Jandakot WA
Departure time:1517
Destination:Quairading WA
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Last update 01 April 2011