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During descent the aircraft suffered a loss of power. The pilot was forced to land into an unsuitable area resulting in the aircraft being damaged when it ran into a fence. The weather was conducive to the formation of carburettor ice at the time of the accident. The carburettor heat flapper valve was found to be stuck in the open (cold air) position. This valve normally closes when the throttle is retarded giving "automatic" protection against ice build up.

The flapper valve shaft had suffered from a lack of lubrication.

Significant factors

The following factors were considered relevant to the development of the accident.

1. The weather was conducive to the formation of carburettor ice.

2. The carburettor heat valve was inoperative.

3. The engine suffered from a loss of power over an area unsuitable for a forced landing.

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General details
Date: 22 May 1993 Investigation status: Completed 
Time: 17:15 EST  
 Investigation type: Occurrence Investigation 
Release date: 09 July 1993 Occurrence class: Technical 
Report status: Final Occurrence category: Accident 
Aircraft details
Aircraft manufacturer: de Havilland Aircraft Pty Ltd 
Aircraft model: DH-82A 
Aircraft registration: VH-TMK 
Sector: Piston 
Damage to aircraft: Substantial 
Departure point:Berwick
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Last update 23 July 2015