Casualties unknown

Glider Crash During Takeoff Due to Tow Rope Release (N694KS)

Plainfield, IL, US

On March 7, 1987, a Schleicher ASK-21 (registration N694KS) operated by Windy Sity Soaring, Inc. was involved in an aviation accident near Plainfield, IL. Investigators recorded the probable cause as: The pilot's decision to release the tow rope at a low altitude due to perceived poor performance, followed by a terrain avoidance maneuver that resulted in wingtip contact with the ground. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.

Sourcesthe U.S. National Transportation Safety Board (NTSB) historical archivePrimary reportUpdated 2026-06-20Data APIEditorial standards

A glider pilot released the tow rope during takeoff due to perceived poor performance, then crashed while maneuvering away from terrain.

What happened

The glider pilot reported that during the takeoff phase of flight, the tow pilot released the tow rope at an altitude of approximately 15 feet above ground level. The release was reportedly initiated because the tow pilot perceived a lack of adequate takeoff and climb performance from the glider.

After being released from the tow aircraft, the glider pilot executed a right turn in an attempt to avoid unacceptable terrain directly ahead. While performing this maneuver, the right wingtip struck the ground. The impact resulted in a crash landing for the glider.

The investigation

Investigation details regarding mechanical examination or specific performance data were not provided in the source material. The sequence of events was primarily established through the pilot's report of the tow rope release and subsequent terrain avoidance maneuver.

Findings

The primary factors contributing to the accident included the perceived lack of takeoff and climb performance, which prompted the premature release of the tow rope at a low altitude. Additionally, the decision to execute a right turn to avoid terrain while at such a low height resulted in the right wingtip impacting the ground.

Safety message

Pilots must ensure that adequate climb performance is established before committing to a tow release during takeoff. Maneuvering to avoid terrain at very low altitudes significantly increases the risk of controlled flight into terrain or structural damage due to insufficient altitude for recovery.

Probable cause

The pilot's decision to release the tow rope at a low altitude due to perceived poor performance, followed by a terrain avoidance maneuver that resulted in wingtip contact with the ground.

Frequently asked questions

What happened in the 7 Mar 1987 Schleicher ASK-21 accident near Plainfield, IL?

A glider pilot released the tow rope during takeoff due to perceived poor performance, then crashed while maneuvering away from terrain.

What aircraft was involved and where did it happen?

The accident on 7 Mar 1987 involved a Schleicher ASK-21, registration N694KS, operated by Windy Sity Soaring, Inc., at Plainfield, IL.

What was the probable cause of the accident?

The pilot's decision to release the tow rope at a low altitude due to perceived poor performance, followed by a terrain avoidance maneuver that resulted in wingtip contact with the ground.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001213X30391. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.