What happened
On March 13, 2014, at approximately 13:30 local time, a Hughes 269C helicopter, registration PH-OKE, was performing an inspection flight at Hilversum Airport (EHHV). The flight, intended for aerial photography of local landmarks, carried a pilot and two observers.
After completing pre-flight checks and receiving clearance from the airport manager to use runway 31, the pilot began taxiing at a low altitude of approximately 1 to 1.5 meters above the ground. During the taxi maneuver, the pilot increased speed to approximately 30 to 40 km/h to pass two stationary aircraft. During this process, the helicopter struck the ground, causing the aircraft to roll and the main rotor blades to impact the surface. The impact resulted in the total destruction of the aircraft. All three occupants sustained light injuries, including bruises and a broken rib.
The investigation
The Dutch Safety Board (OVV) examined the mechanical condition of the aircraft, the meteorological data, and the weight and balance of the helicopter. Technical inspections of the Lycoming engine, the main rotor, and the tail rotor revealed no mechanical failures or defects. Meteorological records indicated stable conditions with no significant turbulence or wind gusts that could have caused the accident.
The investigation also reviewed the aircraft's loading. Calculations showed that the helicopter was slightly over its maximum takeoff weight of 930 kg. While the aircraft was flying in ground effect, which reduces the impact of weight on power requirements, the investigation noted that the margin for error was reduced due to this slight overweight condition.
Findings
- The aircraft was operating at a slight overweight condition, which minimized the safety margins during the low-altitude taxi.
- The pilot likely experienced a moment of reduced situational awareness while maneuvering past other aircraft, leading to the helicopter striking the ground in a lateral tilt.
- There was no evidence of mechanical failure or adverse weather contributing to the crash.