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The pilot intended to ferry the aircraft to another property. He reported that the engine started normally, and he immediately taxied the aircraft to the closest end of the airstrip, and commenced to take-off without having given the engine sufficient time to warm up. He later informed his employer that he had carried out all the necessary pretakeoff checks, including checking the carburettor heat operation. Shortly after becoming airborne the engine failed and the pilot was forced to land in a rough paddock. Inspection of the engine revealed that the carburettor heat scat hose, from the exhaust muff to the carburettor, was detached. No other faults were found which might have caused the engine to fail. The weather was fine and calm, the temperature five degrees Celsius, and the relative humidity approximately 70 per cent. From the Carburettor Icing - Probability Chart, as published in the Aviation Safety Digest Number 108, these conditions were conducive to serious carburettor icing under any power setting. The most probable cause of the engine failure was carburettor icing, and as the carburettor heat scat hose was adrift there was no means of providing heat to the carburettor to clear any ice accumulation. The pilot, in his haste to depart, did not check for the change in engine note and rpm which would indicate that the carburettor heat was functioning when he operated the carburettor heat control during the pretakeoff checks. This occurrence was not the subject of an on-site investigation.

Download Final Report
[ Download PDF: 23KB]
 
 
 
 
General details
Date: 06 November 1989 Investigation status: Completed 
Time: 600 Investigation type: Occurrence Investigation 
Location:"Nivan" (13 km north-west of Deniliquin)  
State: New South Wales  
Release date: 31 January 1990 Occurrence category: Accident 
Report status: Final Highest injury level: None 
 
Aircraft details
Aircraft manufacturer: Piper Aircraft Corp 
Aircraft model: PA-25 
Aircraft registration: VH-PXI 
Serial number: 25-4353 
Type of operation: Aerial Work 
Damage to aircraft: Substantial 
Departure point:"Nivan" NSW
Departure time:N/K
Destination:"Wakool" NSW
 
 
 
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