Aviation safety investigations & reports

Grumman AA5B, VH-WXH, 56 km E of Jandakot WA, 9 February 1984

Investigation number:
Status: Completed
Investigation completed


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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.

Download Final Report
[Download  PDF: 22KB]
General details
Date: 09 February 1984   Investigation status: Completed  
Time: 1517    
Location: 56 km E of Jandakot    
State: Western Australia    
Release date: 26 July 1984   Occurrence category: Accident  
Report status: Final   Highest injury level: Serious  

Aircraft details

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  
Last update 01 April 2011