Incident Overview
A maintenance flight was conducted to verify the operation of a recently installed engine oil temperature gauge. After confirming the gauge was functioning correctly, the pilot initiated a descent toward the airport. While descending through 3,000 feet, the pilot observed white smoke in the cabin and detected fumes consistent with an electrical fire.
Pilot Actions
In response, the pilot turned off the electrical master switch, manually lowered the landing gear, and continued the descent. Upon landing, the aircraft was quickly taxied off the runway, and the fuel selector was turned off. Shortly thereafter, a fire ignited on the left side of the aircraft in the area of the firewall and engine compartment.
Fire Spread and Damage
The fire spread rapidly and ultimately destroyed the aircraft. According to reports, the aircraft had experienced previous electrical problems, including difficulty starting the engine and a heavy load observed on the ammeter during landing gear cycles.
Investigation Findings
Due to the extensive fire damage, the exact origin of the electrical fire could not be verified. No further details about the aircraft, occupants, or location were provided.