Preflight and First Flight
Prior to departure from Miles City, Montana, the pilot obtained a weather briefing that indicated conditions less than visual flight rules (VFR) with icing conditions. The pilot departed and, approximately one hour later, landed to remove ice from the aircraft.
Second Departure and Approach
The pilot departed a second time. While en route, the aircraft encountered lower ceilings and visibility. The pilot attempted to execute the VOR/DME approach to Runway 14 at Rapid City.
Witness Observations
Witnesses observed the aircraft flying at a low altitude with the wings rocking.
Investigation Findings
On-scene investigation revealed approximately one inch of ice accumulation on the leading edges of the wings, horizontal stabilizer, and vertical stabilizer.