NTSB Identification: SEA84FA172A.
The docket is stored on NTSB microfiche number 25597.
Accident occurred Thursday, July 12, 1984 in EPHRATA, WA
Aircraft: Schempp-Hirth VENTUS A, registration: N17KS
Injuries: 1 Fatal,1 Uninjured.

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.

A 'GAGGLE' OF ABOUT 7 GLIDERS WERE MANEUVERING IN A THERMAL WHEN N919R TRIED TO JOIN THE GROUP. THEIR AIRSPEED WAS ABOUT55 KTS AND HIS WAS ESTIMATED AT ABOUT 80 KTS. N919R COLLIDED WITH N17KS AND ENTERED AN INVERTED SPIN FROM WHICH IT DID NOT RECOVER. N17KS MADE A SUCCESSFUL LANDING WITHOUT FURTHER INCIDENT AT THE ARPT OF DEPARTURE.

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

VISUAL LOOKOUT..INADEQUATE..PILOT OF OTHER AIRCRAFT

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

TOTAL..PILOT OF OTHER AIRCRAFT

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

REMEDIAL ACTION..NOT PERFORMED..PILOT IN COMMAND

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