What happened
On the afternoon of 11 December 2022, a Robinson R44 Raven II helicopter, registration N999RL, was conducting a series of flights across Ireland. After departing from Tagoat, Co. Wexford, the aircraft headed toward Kilrush Airfield. While flying near the airfield, the aircraft turned northeast, eventually traveling approximately 8.3 nautical miles away from its intended destination.
Radar data and witness accounts indicate that the helicopter began flying in a back-and-forth pattern over the Kennycourt area. During this period, the aircraft performed several descents and climbs. At approximately 15:45 hrs, the helicopter impacted the terrain in an agricultural field near Kennycourt. The impact and a subsequent fire destroyed the aircraft, and the pilot, the sole occupant, sustained fatal injuries.
The investigation
The investigation examined radar data, witness statements, and video footage of the final moments of the flight. Investigators analyzed meteorological conditions, noting that while the departure area in Wexford had clear skies, the destination and the accident site were experiencing overcast conditions, mist, and low cloud bases between 100 and 500 feet.
Review of video recordings showed the helicopter in a semi-inverted attitude, descending at a steep trajectory just before hitting the ground. The investigation also looked into the aircraft's fuel status and the pilot's flight planning, specifically regarding the pressure to reach the airfield before daylight ended or before fuel levels became critical.
Findings
- The primary cause of the accident was a loss of control due to spatial disorientation.
- This disorientation occurred after the pilot lost external visual references during an attempt to descend or abort a descent in poor visibility.
- Plan continuation bias likely contributed to the accident, as the flight was maintained despite deteriorating visual contact with the ground.
- The pilot may have been under increasing pressure to land or reach Kilrush Airfield due to a decreasing fuel quantity.
- The forces of the impact were such that the accident was not survivable.