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On downwind after the first take-off following a scheduled servicing the pilots were unable to fully extend the landing gear. After all efforts to lower the gear by normal and emergency methods were unsuccessful, the pilot in command carried out a safe landing with the gear retracted. Part of the work carried out during the servicing included the replacement of 'O'-ring seals in the main gear up-lock valve. During re-assembly of this valve, a ball bearing, whose function was to direct fluid to the actuator, was omitted. When the system was activated, insufficient pressure could be generated to fully extend and lock the gear.

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General details
Date: 20 September 1984 Investigation status: Completed 
Time: 1743  
Location:Tocumwal Investigation type: Occurrence Investigation 
State: New South Wales Occurrence type: Wheels up landing 
Release date: 16 September 1985 Occurrence class: Operational 
Report status: Final Occurrence category: Accident 
 Highest injury level: None 
Aircraft details
Aircraft manufacturer: Cessna Aircraft Company 
Aircraft model: 210 
Aircraft registration: VH-MGI 
Type of operation: Flying Training 
Damage to aircraft: Substantial 
Departure point:Tocumwal NSW
Departure time:1740
Destination:Tocumwal NSW
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Last update 13 May 2014