Flight Briefing and Decision
Prior to the flight, the pilot received a weather briefing at 1027 hours. The briefing indicated that Kansas City was reporting very light rime icing from 4,000 to 11,000 feet, and a pilot report (PIREP) noted light to moderate rime ice between 6,000 and 8,000 feet, 30 miles south of Kansas City. The pilot initially stated his intention to cancel the proposed flight and proceed the following day.
However, at 1101 hours, the pilot contacted Flight Service Station (FSS) and indicated he needed to go, initiating a reservation and flight plan. At 1217 hours, he received a weather update which indicated he could expect icing when descending through the clouds.
En Route and Diversion
While en route and flying on top at 11,000 feet, the pilot diverted to Kansas City. When cleared to descend, the pilot stated he was still in the clouds and still accumulating ice, and wanted to remain at 11,000 feet until he cleared the clouds.
Descent and Incident
At 1439 hours, the pilot was advised that he would need to start his descent soon, as he was 13 miles from the outer marker. During the descent, the aircraft disappeared from radar and was observed coming out of the overcast almost straight down.
Post-Incident Observations
No ice was observed on the aircraft after the incident. The aircraft was not equipped with de-icing equipment. The landing gear was found in the down position.
Probable Cause
The source does not provide a stated probable cause.