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At the completion of a gliding turn, during a period of dual instruction, the engine failed to respond when the student re-opened the throttle. The instructor took control of the aircraft and attempted, unsuccessfully, to regain engine power by manipulation of the throttle. Leaving the engine idling, he selected a waterlogged paddock and commenced a flapless approach at approximately 60 knots. On short final it became apparent to the pilot that the aircraft was undershooting the paddock landing site. He selected 20 degrees of flap in an attempt to balloon the aircraft over a ditch and fence. The nosewheel touched the fence, and the aircraft landed heavily on the nose and left mainwheel, bounced, then skidded in the mud with the nosewheel sinking into the soft surface. This caused the aircraft to overturn. Both occupants were uninjured and evacuated the inverted aircraft without assistance. An inspection of the area surrounding the accident site indicated that a roadway parallel to the selected paddock would have afforded a better forced landing site. The pilot stated that he did not consider the roadway as he had been pre-conditioned or had pre-conditioned himself to carry out practice forced landings in paddocks. Examination of the engine revealed that the throttle control cable assembly outer flexible casing had separated from the staked joint of the rigid conduit at the carburettor attachment end. This prevented the inner cable from moving when the throttle was operated, therefore the carburettor throttle butterfly remained on the idle stop. The Aircraft Manufacturer's Service Manual specifies a requirement to inspect the staked joint of this throttle control cable assembly. The maintenance of this aircraft had been preformed with reference to CAO 100.5.1 and no such specific inspection was called for in the schedule.

Download Final Report
[ Download PDF: 24KB]
 
 
 
 
General details
Date: 12 August 1989 Investigation status: Completed 
Time: 1206 Investigation type: Occurrence Investigation 
Location:Mills Cross (6km South of Bungendore)  
State: New South Wales  
Release date: 23 April 1990 Occurrence category: Accident 
Report status: Final Highest injury level: None 
 
Aircraft details
Aircraft manufacturer: Cessna Aircraft Company 
Aircraft model: 172 
Aircraft registration: VH-MGZ 
Serial number: 17266694 
Type of operation: Flying Training 
Damage to aircraft: Substantial 
Departure point:Canberra ACT
Departure time:1145
Destination:Canberra ACT
 
 
 
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