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The pilot reported that he had completed his pre-landing checks, that he had sighted three green lights prior to landing and that the landing gear had retracted during the landing roll. Ground markings and aircraft damage indicate that the landing gear was in the up position on touchdown, and did not retract during the landing roll. A technical inspection of the landing gear did not disclose any fault which might have lead to inadvertent retraction of the gear or failure of the gear to extend when selected down. The flaps had not been extended past 10 degrees during the approach to land. It is most probable that the pilot did not correctly complete the pre-landing checks, and as a result did not select the landing gear down. The reasons why the pilot may have forgotten to extend the landing gear could not be determined.

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General details
Date: 31 August 1990 Investigation status: Completed 
Time: 924  
Location:Lake Gregory Investigation type: Occurrence Investigation 
State: Western Australia Occurrence type: Wheels up landing 
Release date: 22 November 1990 Occurrence class: Operational 
Report status: Final Occurrence category: Accident 
 Highest injury level: None 
Aircraft details
Aircraft manufacturer: Piper Aircraft Corp 
Aircraft model: PA-23 
Aircraft registration: VH-EOU 
Serial number: 27-7554149 
Type of operation: Charter 
Damage to aircraft: Substantial 
Departure point:Halls Creek WA
Departure time:0830
Destination:Lake Gregory WA
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