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About 45 minutes after DEPARTURE the radio communications, and radio navigation aid signals became weak, and a squeal was heard through the audio system. The pilot realised that he had an electrical problem, but he did not check the ammeter, or the positioning of the alternator switch believing that he had turned the switch on after start. Approaching Canberra the pilot was given an airways clearance to maintain 4000 feet. All communications were then lost. He squawked code 7600, and proceeded as per the flight plan to Canberra, maintaining VMC as all his navaids had now ceased to operate. On arrival, the pilot observed that emergency services were being positioned along Runway 30. He commenced an approach from 4000 feet, (2112 feet above ground level), approximately 1000 feet above normal circuit height. The pilot now felt under a great deal of stress and was becoming task saturated. On downwind he placed the landing gear selector in the down position, but failed to check if the gear had extended. Turning onto final approach he selected the flaps down, which failed to operate. He then noticed that the landing gear position lights were not illuminated, but he did not verify the landing gear position with the manual extension handle. The Tower directed a green light at the aircraft which convinced the pilot that his landing gear must be down. Shortly after touchdown the partially extended landing gear collapsed. The aircraft was found to have a completely discharged battery. The engine was started using ground power and the alternator operated normally, which recharged the battery. The electrical and radios systems were also found to function normally.

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General details
Date: 30 October 1988 Investigation status: Completed 
Time: 1754  
Location:Canberra Airport Investigation type: Occurrence Investigation 
State: Australian Capital Territory Occurrence type: Wheels up landing 
Release date: 24 September 1990 Occurrence class: Operational 
Report status: Final Occurrence category: Accident 
 Highest injury level: None 
Aircraft details
Aircraft manufacturer: Beech Aircraft Corp 
Aircraft model: 36 
Aircraft registration: VH-PGG 
Serial number: E-317 
Type of operation: Private 
Damage to aircraft: Substantial 
Departure point:Hamilton VIC
Departure time:1525
Destination:Canberra ACT
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