Incident Overview
A pilot/owner reported that during a climb through 9,000 ft MSL en route to 10,000 ft MSL on an IFR flight plan, an electrical odor was detected. The cabin rapidly filled with dense smoke, prompting the pilot to shut off all electrical switches and initiate an emergency descent.
Emergency Descent and Landing
During the descent, the smoke substantially cleared from the cabin. The landing gear was extended using emergency procedures. Upon landing on rolling terrain, the gear collapsed, resulting in damage to the aircraft. No fire continued on the ground after landing.
Post-Accident Investigation
A post-accident investigation revealed that the owner had improperly installed an alternator wiring harness. The harness rubbed against the noise suppressor, wearing through the insulation. This allowed an electrical fire to erupt.