What happened
On 27 June 2010, a Eurocopter EC 130 B4 helicopter, registration PH-ECJ, was performing a photo flight over the Maasvlakte in the Netherlands. The mission was to capture images of the Tour du Port, a cycling race taking place in the area. The aircraft was hovering at a low altitude of approximately 220 feet above the Westplaatweg, positioned directly in the path of the approaching cyclists.
While the helicopter was maintaining a stationary hover, it suddenly began to rotate rapidly around its vertical axis. This rotation was accompanied by a sudden loss of altitude. Within seconds, the aircraft descended sharply and struck the ground at a high vertical speed. The impact was severe, resulting in the four deaths of the occupants, including the pilot, and leaving one passenger with severe injuries. The aircraft was completely destroyed upon impact.
The investigation
The Dutch Safety Board (OVV) conducted a technical examination of the wreckage, involving experts from the French BEA and the manufacturer, Eurocopter. The investigation focused on the mechanical state of the engine, the rotor systems, and the flight controls.
Technical analysis of the PH-ECJ revealed that the engine was supplying power to the gearbox at the moment of impact and that the compressor blades were rotating. The investigation found no evidence of mechanical failure or technical malfunctions in the engine or the airframe. The control instruments, including the cyclic and collective, were found to be in good working order. The investigation also examined meteorological conditions, noting moderate updrafts but concluding that wind-induced turbulence was unlikely to have caused the sudden rotation.
Findings
While the investigation could not definitively establish a single cause, several critical factors were identified:
- The aircraft experienced a rapid, uncontrolled rotation that the pilot was unable to stop.
- The descent was likely caused by a vortex ring state, a dangerous aerodynamic condition occurring during low-speed or hovering flight.
- The low altitude of approximately 220 feet provided insufficient margin for the pilot to recover from the sudden loss of control or an emergency situation.
- The investigation ruled out technical failure or medical issues as primary causes.
Safety action
Following the findings, a recommendation was made for the State Secretary for Infrastructure and the Environment to work with the European Aviation Safety Agency (EASA) to align regulations regarding the removal of flight controls during aerial work with those used for commercial passenger transport.