What happened
The aircraft underwent deicing procedures using pure ethylene glycol at room temperature before commencing an instrument flight rules (IFR) departure. The weather conditions at the time included freezing rain and snow, with a temperature and dew point of 33/31 degrees.
Following takeoff, the pilot received departure instructions to execute a right turn toward the north and proceed directly to the VOR. The aircraft was located nine hours after it departed, lying scattered in a field situated 1.5 miles north of the airport.
The investigation
The examination of the event focused on the operational environment and the condition of the aircraft prior to flight. The deicing fluid used was identified as pure ethylene glycol applied at room temperature. The meteorological data confirmed the presence of freezing precipitation during the departure phase.
Findings
The proximity of the impact site to the airport suggests a failure shortly after departure. The combination of freezing rain and snow created significant icing hazards. The use of pure ethylene glycol at room temperature may have been insufficient for the specific atmospheric conditions encountered during the climb.
Safety message
Proper deicing fluid selection and application temperature are critical when operating in freezing precipitation. Pilots must ensure that deicing procedures match the current weather conditions to prevent ice accumulation on critical surfaces.