Aviation safety investigations & reports

Total power loss involving a de Havilland Aircraft Pty Ltd DH-82A, VH-TMK, 3km S Berwick Airfield, VIC on 22 May 1993

Investigation number:
Status: Completed
Investigation completed


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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.

Download Final Report
[Download  PDF: 15KB]
General details
Date: 22 May 1993   Investigation status: Completed  
Time: 17:15 EST    
State: Victoria    
Release date: 09 July 1993   Occurrence category: Accident  
Report status: Final    

Aircraft details

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  
Destination Berwick