NTSB Identification: NYC06LA127.
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Accident occurred Sunday, May 28, 2006 in Eighty Four, PA
Probable Cause Approval Date: 07/25/2007
Aircraft: Schweizer SGS 1-35, registration: N91MC
Injuries: 1 Fatal.
NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.
During a left turn from base leg to final leg, the left wing and nose of the glider dropped below the horizon. The glider then descended rapidly into trees from approximately 800 feet agl. Examination of the wreckage did not reveal any preimpact mechanical malfunctions. At the time of the accident, the pilot was 72 years of age, and had accumulated approximately 1,100 hours of glider experience; of which, about 7 hours were accumulated during the 30 days preceding the accident. The pilot had a mechanical mitral valve replacement nearly 5 years prior to the accident, disqualifying him from holding an FAA medical certificate. However, the FAA Aerospace Medical Certification Division, after review, authorized a special issuance third-class medical certificate. The mechanical replacement valve significantly increased the pilot's cumulative risk of a stroke, which would likely not be detectable on autopsy if it occurred just prior to impact.
The National Transportation Safety Board determines the probable cause(s) of this accident to be: The pilot's incapacitation, which resulted in a loss of aircraft control during approach, and subsequent collision with trees. Full narrative available
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