Preflight and Departure
Upon arriving at the airport, the pilot discovered the airplane's battery was weak. He requested an electrical boost from a local mechanic, which allowed the engine to be started. After starting the engine, the pilot let it run for several minutes before taxiing to the runway. The pilot reported that the runup procedure was normal. He turned off all electrical equipment, leaving only one communication radio on.
In-Flight Malfunction
After liftoff, the pilot found that the landing gear would not retract completely. He elected to continue the flight. While en route, he attempted to manually lower the main landing gear. During this attempt, he felt pressure on the emergency extension handle and decided to discontinue the extension operation.
Landing and Wreckage Recovery
During the landing roll at the destination airport, the right main landing gear collapsed, and the airplane veered off the right side of the runway. As the right wing was lifted up during the wreckage recovery phase, the pilot lowered the right main gear with the emergency extension handle.
Electrical System Examination
Examination of the electrical system disclosed that a diode in the alternator had slipped from its normally installed position.
Probable Cause
The investigation report did not provide a stated probable cause.