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Following a normal touchdown and landing roll, the pilot commenced a left turn to backtrack along the runway to the parking area. During the turn the right main landing gear leg collapsed. An inspection of the gear leg revealed an incorrectly seated O-ring, which had allowed hydraulic pressure to bypass a section of the oleo. This resulted in the internal locking pins becoming unlatched prematurely when the assembly was subjected to side loads during the turn at the end of the runway. Records showed that the O-ring had recently been replaced, and it is likely that the distortion of the ring occurred during the oleo re-assembly process.

Download Final Report
[ Download PDF: 22KB]
General details
Date: 21 December 1987 Investigation status: Completed 
Time: 843  
Location:Ngukurr Investigation type: Occurrence Investigation 
State: Northern Territory  
Release date: 29 April 1988  
Report status: Final Occurrence category: Accident 
 Highest injury level: None 
Aircraft details
Aircraft manufacturer: Cessna Aircraft Company 
Aircraft model: 402 
Aircraft registration: VH-TFD 
Serial number: 402C0420 
Type of operation: Aerial Work 
Damage to aircraft: Substantial 
Departure point:Tindal NT
Departure time:0743
Destination:Ngukurr NT
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