History of the Flight
On 19 July 2015, the pilot of an Enstrom 280FX, registration N280CH, departed from a prepared landing site adjacent to his home near Carlingford, County Louth, Ireland. The intended destination was Derryogue Airfield, County Down, Northern Ireland, where the helicopter had originated earlier that day. Shortly after take-off, while crossing the boundary wall of his property in a south-south-easterly direction, the pilot observed an overboost warning light, indicating high engine manifold pressure. The manifold pressure gauge read 40 IN.HG, exceeding the red-line limit of 39 IN.HG. The pilot attempted to reduce manifold pressure by lowering the collective lever, which caused engine and main rotor RPM to increase. When he tried to reduce RPM, the helicopter yawed left, and the pilot decided to perform a forced landing in a nearby field. The helicopter impacted sloping, uneven ground, coming to rest approximately 140 metres south-east of the departure point, facing back toward it. The helicopter was substantially damaged.
Damage to the Aircraft
During the impact, the rotating main rotor struck the ground, causing severe damage to the blades. The right-hand landing skid and the right side of the fuselage were also damaged.
Meteorological Conditions
Met Éireann provided an aftercast indicating surface wind from 270° at 7–10 knots, temperature approximately 17°C, and visibility 20–30 km. The pilot reported generally calm conditions. An Advanced Paramedic who attended the scene noted that a nearby windsock was hanging limp, suggesting little wind at the time.
Emergency Response
A member of the public called emergency services after witnessing the accident. When emergency medical personnel arrived, the helicopter had already been evacuated, and the pilot was found in a nearby house. He declined medical attention, stating he only had a sore elbow.
Aircraft Information
The Enstrom 280FX is a two-to-three-seat helicopter manufactured in 1988. It was powered by a Lycoming HIO-360-F1AD turbocharged four-cylinder engine driving a three-blade counterclockwise-rotating main rotor and a two-blade tail rotor. An engine overboost warning system consisted of a pressure switch in the manifold pressure line and an amber light in the cockpit annunciator panel, designed to illuminate at manifold pressures between 36 and 40 IN.HG. The helicopter had a total operating time of approximately 988 hours at the time of the accident. The most recent annual inspection was performed on 20 February 2015, also at 986 hours. The FAA Standard Airworthiness Certificate was issued on 18 July 2012, valid until 30 June 2018.
Operating Procedures
For a helicopter with a counterclockwise-rotating main rotor, increasing power typically causes a yaw to the right, while reducing power causes a yaw to the left. According to the manufacturer, fly-weights on the tail rotor blade retention plates ensure neutral pedal position at approximately 29 IN.HG manifold pressure. The Pilot Training Guide notes that the aircraft requires slight left pedal in hover and climb, and significant right pedal in low power situations. The normal take-off procedure involves adjusting throttle to maintain engine RPM in the green band (2,900–3,050 RPM) when the helicopter is light on the skids, then raising the collective to lift off. The helicopter is fitted with a mechanical throttle correlator that automatically maintains RPM during collective adjustments. The guide advises against chasing RPM with the throttle, recommending gentle throttle adjustments and allowing blade RPM to stabilise. It also notes that during transition to climb from hover, RPM may exceed the red line, requiring slight throttle reduction.