Aviation safety investigations & reports

Beech 35/C33 Debonair, VH-DDB, Inverell, NSW, 25 July 1970

Investigation number:
Status: Completed
Investigation completed


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The pilot completed the refuelling of the aircraft and pushed it back to a position approximately half way across the 100 feet wide apron. He applied the parking brake, carried out a pre-flight check and commenced the starting up procedure. He made two unsuccessful attempts to start the engine and then adopted the flooded start technique by setting the throttle to 3/4 open and the mixture control to "Idle Cut Off". When the engine fired on this attempt the pilot moved the mixture control to "Rich" but then found that he was unable to close the throttle, which had apparently jammed. The aircraft moved forward under high power, overcoming the parking brake, which was weak. Before the pilot was able to move his feet from their position on the floor and place them on the brake pedals, or take any of the other courses of action which were indicated, the aircraft had travelled forward some 60 feet to a position at which it struck a heavy wooden post and a steel stake on the fence line of the apron. Examination of the throttle control assembly did not disclose any defect which would have accounted for the inability of the pilot to control the engine power output, however, misuse of the throttle locking button could have led to a situation in which the throttle control jammed.
Download Final Report
[Download  PDF: 91KB]
General details
Date: 25 July 1970   Investigation status: Completed  
Time: 1230 EST    
Location: Inverell    
State: New South Wales    
Release date: 23 August 1971   Occurrence category: Accident  
Report status: Final   Highest injury level: None  

Aircraft details

Aircraft details
Aircraft manufacturer Beech Aircraft Corp  
Aircraft model 35  
Aircraft registration VH-DDB  
Type of operation Aerial Work  
Damage to aircraft Substantial  
Departure point Inverell North  
Departure time 1230  
Destination Inverell North  
Last update 16 May 2014