What happened
During the landing roll, the nose gear of the aircraft collapsed. This event followed a period of significant electrical issues; the aircraft had experienced a total electrical failure on a previous flight, as well as during the approach phase of this specific flight.
The investigation
Following the initial electrical failure, company maintenance personnel replaced the battery and verified that the electrical system was operational according to manufacturer procedures. Maintenance protocols required inspecting wiring to the engine and accessories, replacing damaged wires and clamps, and ensuring terminal security.
Upon examination of the aircraft, investigators discovered that the output lugs on both alternators had broken off. A metallurgical examination of the fracture surfaces showed no discernable fracture features, but both components exhibited evidence of electrical arcing, which caused significant melting at the separated ends.
A post-accident retraction test performed on the landing gear system revealed no discrepancies or mechanical defects within the gear system itself. At the time of the accident, only 12.7 hours had passed since the aircraft's last annual inspection.