NTSB Identification: WPR11CA060
14 CFR Part 91: General Aviation
Accident occurred Friday, November 26, 2010 in Warner Springs, CA
Probable Cause Approval Date: 04/12/2011
Aircraft: BURKHART GROB G-103A TWIN II ACRO, registration: N855BG
Injuries: 2 Uninjured.
NTSB investigators used data provided by various entities, including, but not limited to, the Federal Aviation Administration and/or the operator and did not travel in support of this investigation to prepare this aircraft accident report.
The certified flight instructor (CFI) stated that he was providing instruction to a student pilot in a glider. After a routine local instructional flight, they returned to the departure airport for landing. The student was flying the glider and the CFI was providing verbal instructions to him as they completed a standard traffic pattern to the dirt landing area. He reported that there was a crosswind at 12 knots, gusting to about 20 knots. The glider encountered a high sink rate and the CFI took authority over the controls. The glider ground looped, resulting in substantial damage to the tail. The CFI reported no preimpact mechanical malfunctions or failures with the glider that would have precluded normal operation.
The National Transportation Safety Board determines the probable cause(s) of this accident to be: The certified flight instructor's inadequate compensation for the crosswind and delayed remedial action during landing, which resulted in a ground loop. Full narrative available
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