NTSB Identification: NYC97LA085.
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Accident occurred Sunday, May 04, 1997 in MARION, OH
Probable Cause Approval Date: 04/10/1998
Aircraft: Marsh-Turner BG-12A, registration: N8711R
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.

With the owner at the flight controls, the experimental homebuilt glider was under tow to take it to another airport. Witnesses reported that about 1 minute after departure, the glider entered into a series of divergent pitch oscillations which terminated in a near vertical dive into a field. The tow rope separated during the oscillations. According to an FAA report, '...The rod end of the elevator/aileron control stick was found pulled out of push rod. The meal casing that the rod end fitted into was crushed. The rod end contained 1 fastener (rivet) core with signs of fretting and scoring, with the remaining attaching fastener core missing....' The last annual inspection was performed in August 1995. The glider was operated on an FAA special flight permit, which required either an inspection by an aircraft mechanic or a repair shop before the flight. No record of the inspection was found by the FAA inspectors.

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

Disconnection of the elevator control rod which resulted in the loss of elevator control. A factor was failure to complete the required maintenance inspection.

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