What happened
The pilot reported that while conducting the final approach to the heliport, the wind direction shifted unexpectedly. This change in conditions resulted in an increased sink rate and higher ground speed than anticipated. To counteract these effects and maintain a safe landing profile, the pilot executed a flare maneuver that was more aggressive than normal. During this hard flare, the helicopter's tail rotor made contact with the heliport perimeter fence.
The investigation
Investigation of the incident included an assessment of the meteorological conditions at the time of the event. Reported wind data from a nearby airport located approximately 10 miles away indicated winds from 130 degrees at 8 knots, with no gusts reported in that vicinity. However, local microclimates or rapid shifts near the heliport likely contributed to the conditions experienced by the pilot.
Findings
The primary factor leading to the damage was the tail rotor striking the perimeter fence. This contact occurred as a direct result of the pilot's attempt to compensate for a sudden wind shift that increased both sink rate and ground speed during the final phase of flight. The aggressive flare maneuver, while intended to stabilize the aircraft, resulted in insufficient clearance between the tail rotor and the fixed obstacle.