20191216022089A

Airman was performing local area pattern work on 16 December, 2019 in N719JS, an experimental Bearhawk, s/n 2008 Sample John W, for his second flight of the day performing touch and go landings on both the paved runway and the grass section between the runway and taxi way. This section is the longer grass section located between taxiway 4A and 3A. During the second grass landing on roll out the aircraft right main tire made contact with an object in the taller grass.

Airman stated that from the air, with the time of year and with the grass being browner, the section of taller grass was not visible on approach and was not noticed until rollout and engine power reduced for taxi. At the last moment the airman noticed the taller grass section (approximately 6 feet around section) and tried to maneuver the aircraft to straddle the taller grassy section as there was not enough time or power, to either maneuver completely to one side or the other, or take back off.

This caused the right main to lift, come back down. During this action the airman lost control while trying to recover the aircraft. The aircraft main tires bounced several times, then the aircraft crossed taxiway A4. The dirt was softer, the aircraft started into a right wing directional slide. The right main gear folded under the fuselage and caused the right wing tip and prop to strike the dirt, coming to rest.

During the investigation it was found that within the taller grass of approximately 12? Compared to the surrounding area of approximately 2-3? Of mowed area, there was a concrete obstruction. This obstruction is a survey marker, surrounded by a pvc pipe and rounded concrete rising several inches above ground level but not visible through the grass. Obstruction is not marked by any means and is not depicted on any airport charts.

Airman stated that there was no influence from weather, as it was a calm and good day to fly. Aircraft had no mechanical issues and only cause was the hidden obstacle in the grass.