Incident Overview
A single-engine airplane (type not specified) encountered a partial loss of electrical power while en route at night. The pilot attempted to electrically extend the landing gear, but the gear did not deploy. Subsequently, the pilot manually extended the landing gear; however, the three green annunciator lights confirming that the landing gear was extended and locked did not illuminate.
Approach and Landing
Without radio communications, the pilot received an air traffic control clearance to land via a steady green light gun signal. During the landing roll, the left main landing gear collapsed. The airplane then exited the runway, struck a runway sign, spun 180 degrees, and came to rest upright.
Investigation Findings
The investigation did not determine the reason for the partial loss of electrical power. No further information regarding the aircraft, occupants, or injuries was provided in the source.