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The pilot had just commenced a procedure turn at the end of a spray run, at a height of 200 feet above ground level, when the engine failed without warning. During the ensuing forced landing the aircraft landed heavily and overturned. The engine failure was caused by separation of number nine cylinder link rod end, which resulted in the piston lifting the head off the cylinder. The cause of the failure could not be positively determined, but was probably due to the link pin bush being worn away, and excessive tolerance between the link rod and link pin causing a fatigue failure of the link rod. Aircraft records showed that the engine had completed 184 hours since overhaul, but the internal appearance of the engine was that of an engine that had operated for a longer time. The reason for the unusual condition of the engine could not be established.

Download Final Report
[ Download PDF: 22KB]
General details
Date: 02 February 1988 Investigation status: Completed 
Time: 730  
Location:Nr Brookstead 57 km WSW Toowoomba Investigation type: Occurrence Investigation 
State: Queensland  
Release date: 25 October 1988  
Report status: Final Occurrence category: Accident 
 Highest injury level: None 
Aircraft details
Aircraft manufacturer: Air Tractor Inc 
Aircraft model: AT301 
Aircraft registration: VH-FAA 
Serial number: 301-0197 
Type of operation: Aerial Work 
Damage to aircraft: Substantial 
Departure point:Nr Brookstead QLD
Departure time:0700
Destination:Nr Brookstead QLD
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