NTSB Identification: CHI91FA212B.
The docket is stored on NTSB microfiche number 44718.
Accident occurred Sunday, July 07, 1991 in HINCKLEY, IL
Probable Cause Approval Date: 12/14/1992
Aircraft: SLINGSBY KESTREL 19, registration: N1954E
Injuries: 2 Serious.

NTSB investigators either traveled in support of this investigation or conducted a significant amount of investigative work without any travel, and used data obtained from various sources to prepare this aircraft accident report.

THE GLIDER PILOT RETURNED TO THE UNCONTROLLED AIRPORT AND ENTERED A STANDARD (LEFT-HAND TURNS) TRAFFIC PATTERN FOR THE ACTIVE RUNWAY. HE STATED HE BROADCAST HIS POSITION AND INTENTIONS ON THE COMMON TRAFFIC ADVISORY FREQUENCY. THE PILOT REPORTED HE WAS ESTABLISHED ON FINAL APPROACH FOR 5 TO 10 SECONDS BEFORE HE HEARD A 'SAWING-SCRUNCH LIKE ONE MIGHT IMAGINE OF FIBERGLASS ON FIBERGLASS.' WITNESSES REPORTED THIS GLIDER WAS OVERTAKING A SLOWER, LOWER GLIDER AS IT DESCENDED TOWARD THE RUNWAY. BOTH GLIDERS IMPACTED TERRAIN IN A BEAN FIELD ABOUT 1/4 TO 1/2 MILE FROM THE RUNWAY. THE PILOT STATED HE NEVER SAW THE OTHER GLIDER, AND NEITHER PILOT HEARD THE OTHER'S RADIO TRANSMISSIONS. THE PILOT OF THE LOWER GLIDER HAD ENTERED THE TRAFFIC PATTERN USING NON-STANDARD (RIGHT-HAND) TURNS.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

THE FAILURE OF BOTH PILOTS TO MAINTAIN ADEQUATE VISUAL LOOKOUT AND ENSURE ADEQUATE SEPARATION DURING TRAFFIC PATTERN OPERATIONS. A RELATED FACTOR IS THE NON-STANDARD UNCONTROLLED AIRPORT PROCEDURES USED BY N126CC.

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