NTSB Identification: SEA92LA098.
The docket is stored on NTSB microfiche number 46328.
Accident occurred Wednesday, May 20, 1992 in BIG TIMBER, MT
Probable Cause Approval Date: 06/30/1993
Aircraft: SCHWEIZER SGS-1-35C, registration: N2739H
Injuries: 1 Uninjured.

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 CROSS COUNTRY FLIGHT, THE GLIDER WAS UNABLE TO MAINTAIN ALTITUDE DUE TO A LOSS OF LIFT. THE PILOT INITIATED A FORCED LANDING TO AN OPEN FIELD. WHEN APPROXIMATELY 30 FEET AGL, THE GLIDER ENTERED A HIGH SINK RATE. THE PILOT REDUCED THE ANGLE OF ATTACK AND RETRACTED THE FLAPS, HOWEVER, THE GLIDER CONTINUED TO SINK AND LANDED HARD.

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

AIRSPEED WAS NOT MAINTAINED. FACTORS TO THE ACCIDENT WERE: NO THERMAL LIFT AND INADEQUATE REMEDIAL ACTION.

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