SYNOPSIS
The aircraft was on a local flight with two occupants on board when the engine overheated. This caused a pressure cap installed on the cooling system expansion bottle to fail. The cockpit filled with coolant vapour, obscuring visibility and rendering control of the aircraft difficult. The Pilot attempted to make a precautionary landing under power in a field. The aircraft impacted heavily, which resulted in severe damage to the airframe. Both occupants were seriously injured. There was no fire. The AAIU makes one Safety Recommendation in relation to this accident.
