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The pilot reported that prior to landing all landing gear system indications were normal, with all legs of the gear indicated down. After touchdown the left wing slowly lowered and the pilot was unable to prevent the wingtip and propeller from contacting the ground. The aircraft then veered to the left off the runway with the left landing gear collapsed. Subsequent examination found a torsional overload failure of the left maingear leg torque tube originating from cracks near the fork bolt boss. The torque tube cracking is thought to be caused by repeated overloading of the torque tube assembly due to inadequate lubrication, during routine maintenance, of the retraction linkages. This is a known problem and is addressed in Airworthiness Advisory Circular (AAC) 160-4 of February 1985. The subject torque tube was of an old design without the later modification introducing the reinforcing gusset.
Download Final Report
[ Download PDF: 13KB]
General details
Date: 23 December 1992 Investigation status: Completed 
Time: 7:15 EST  
 Investigation type: Occurrence Investigation 
Release date: 06 February 1996 Occurrence class: Technical 
Report status: Final Occurrence category: Accident 
Aircraft details
Aircraft manufacturer: Cessna Aircraft Company 
Aircraft model: 340 
Aircraft registration: VH-HMN 
Serial number: 340-0502 
Sector: Piston 
Damage to aircraft: Substantial 
Departure point:Bankstown NSW
Destination:Maitland NSW
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Last update 07 July 2015