Helicopter Tail Rotor Strikes Hydrant During Approach After Go-Around (N508MT)

Sequence of Events

The pilot conducted two reconnaissance flights over the intended landing zone before initiating an approach. During the approach, blowing snow prompted the pilot to perform a go-around. A third reconnaissance flight over the landing zone followed. On the second approach, the helicopter's tail rotor struck a standing frost-free hydrant. The hydrant measured approximately 1 inch in diameter and 3 feet in height.

Post-Strike Maneuver

After the impact, the helicopter spun to the right. The pilot executed a hovering autorotation to bring the helicopter to the ground.

Obstacle Marking

Ground personnel had placed lights to mark the perimeter of the landing zone. However, they later stated that they had not walked the interior of the landing zone and were unaware of the hydrant's presence.