Accident Sequence
After takeoff in instrument meteorological conditions, the pilot observed the airplane's cabin lights flicker. Shortly thereafter, the low voltage warning light illuminated and the voltmeter indicated an abnormal voltage reading. The pilot received air traffic control clearance to deviate and perform an Instrument Landing System (ILS) approach to a nearby airport. During the approach, after attempting a normal extension of the landing gear, the pilot lost localizer and glideslope indications.
The investigation did not determine whether the landing gear had achieved a down-and-locked position at that time. The pilot executed a missed approach and returned to the departure airport using dead reckoning. He stated that he followed the emergency gear extension procedure but was unable to verify that the gear was down and locked due to his heavy workload and ice accumulation on the airplane.
Landing and Accident
The pilot received light gun signals from the tower to land. During landing, the airplane's left main gear collapsed, causing the airplane to skid, strike a mound of dirt, and a concrete electrical vault.
Postaccident Examination
Postaccident examination revealed that the alternator belt had become unattached. The landing gear functioned normally when checked after the accident.