On May 10, 2002, at 1400 central daylight time, a Glaser-Dirks-Flugzeubau DG-100G, N169LM, piloted by a commercial pilot, sustained substantial damage during an aborted takeoff on runway 27 (2,300 feet by 100 feet, dry/turf) at the Sky Soaring Airport (55LL), Union, Illinois. Visual meteorological conditions prevailed at the time of the accident. The personal flight was being operated under the provisions of 14 CFR Part 91 without a flight plan. The pilot reported serious injuries. The local flight was originating at the time of the accident.

According to the pilot's written statement, the accident occurred during an aero-tow launch. The pilot reported, "When I was ready to launch, I gave the wing-runner the signal to lift the wing and he did. I [signaled] the tow plane to begin take-off. At the start of the take-off roll, I gave a little right rudder input as the glider was veering left of the intended path. Almost immediately I saw the nose of the glider was moving very erratically. I decided to attempt to abort the launch by pulling the release." The pilot stated that after the tow-rope release was made, "... the plane was a few feet above the ground and it was out of control." The pilot reported the glider impacted the terrain on the north side of the runway. The pilot did not report any mechanical problems or malfunctions with the glider.

A weather observation station, located at the De Kalb Taylor Municipal Airport (DKB), about 16 nautical miles (nm) from the accident site on a 213 degrees magnetic heading, recorded the weather conditions approximately 8 minutes after the accident as:

Observation Time: 1408
Wind: 260 degrees magnetic at 15 knots gusting to 18 knots
Visibility: 10 statute miles
Sky Condition: Sky Clear
Temperature: 17 degrees Celsius
Dew Point: -13 degrees Celsius
Pressure: 30.30 inches-of-mercury

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