Summary
On May 18, 2012, a Schempp-hirth VENTUS 2CT (N900BM) was involved in an accident near Duncansville, PA. The accident resulted in 1 serious injury. The aircraft sustained substantial damage.
The National Transportation Safety Board determined the probable cause of this accident to be: The glider’s encounter with atmospheric lift conditions not sufficient to clear terrain, which resulted in an aerodynamic stall. Contributing to the accident was the pilot's decision to continue turning toward a ridgeline.
The pilot reported that the glider was towed to an altitude of 2,000 feet above ground level, released, and flown for more than 2 hours without incident. He subsequently was looking for lift and performing "S" turns, while flying away from a ridgeline. During one of the "S" turns, he encountered a 200 to 300 foot increase in lift and elected continue turning to the left. As the glider turned directly toward the ridgeline, it encountered a large downdraft and loss of airspeed. The glider stalled, spun to the left, and immediately struck trees. The glider's tail boom separated and both wings were substantially damaged. The pilot reported that he did not experience any mechanical malfunctions or failures during the flight.
This accident is documented in NTSB report ERA12CA352. AviatorDB cross-references NTSB investigation data with FAA registry records to provide comprehensive safety information for aircraft N900BM.
Accident Details
Probable Cause and Findings
The glider’s encounter with atmospheric lift conditions not sufficient to clear terrain, which resulted in an aerodynamic stall. Contributing to the accident was the pilot's decision to continue turning toward a ridgeline.
Aircraft Information
Registered Owner (Historical)
Analysis
The pilot reported that the glider was towed to an altitude of 2,000 feet above ground level, released, and flown for more than 2 hours without incident. He subsequently was looking for lift and performing "S" turns, while flying away from a ridgeline. During one of the "S" turns, he encountered a 200 to 300 foot increase in lift and elected continue turning to the left. As the glider turned directly toward the ridgeline, it encountered a large downdraft and loss of airspeed. The glider stalled, spun to the left, and immediately struck trees. The glider's tail boom separated and both wings were substantially damaged. The pilot reported that he did not experience any mechanical malfunctions or failures during the flight. He further stated that he should not have continued the left turn and that standard training techniques called for continuing to do "S" turns when close to ridges or mountains until at least 200 to 300 feet above the highest point, which would provide for adequate altitude to recover from possible stalls caused by wind gusts.
Data Source
Data provided by the National Transportation Safety Board (NTSB). For more information on this event, visit the NTSB Records Search website. NTSB# ERA12CA352