What happened
While performing an ILS approach to runway 35, the crew encountered condensation on the windshield when the aircraft was roughly 100 feet above decision height. The aircraft type experienced a heavy touchdown approximately one-third of the way down the 5,200-foot runway. Following the landing, the pilot attempted to decelerate with propellers in ground fine, but braking was ineffective due to the wet runway conditions and the absence of an anti-skid system.
Evidence including tire rubber reversion and runway scrub marks indicated that hydroplaning occurred. The aircraft failed to stop within the remaining runway length, eventually exiting the pavement and descending down an embankment into a nearby field. During the emergency, two passengers acting as flight attendants assisted with the evacuation of the other occupants.
Findings
Investigations identified several contributing environmental and operational factors. Weather conditions included rain, fog, and a slight tailwind, which increased the required stopping distance. The pilot's touchdown point was noted as being too far down the runway, and a missed approach was not initiated despite visibility challenges.
Additionally, the investigation highlighted deficiencies in safety training and communication. It was determined that the individuals acting as flight attendants lacked proper emergency procedure training. Furthermore, the passenger briefing process was insufficient, and the onboard briefing cards were found to be inadequate for ensuring passenger safety.