NTSB Identification: ANC05FA144.
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Accident occurred Monday, September 12, 2005 in Nenana, AK
Probable Cause Approval Date: 07/31/2006
Aircraft: Bellanca 7GCBC, registration: N36237
Injuries: 2 Fatal.
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.
The private pilot was conducting a personal local flight under Title 14, CFR Part 91. A witness said he saw the accident airplane flying level above the trees, when it abruptly started a steep, near vertical, climb. At the top of the climb, the witness said the airplane descended in a steep spiral and impacted the ground. The airplane impacted in a near vertical, nose low attitude. The right wing was found standing on its leading edge, with its top wrapped counter-clockwise around a small group of willows. Both blades of the two-bladed propeller had extreme bending and torsional twisting, chord-wise scratching, and areas sanded clean of paint. The engine exhaust manifold had plastic folding. The accident pilot/owner was a certified aircraft mechanic, who reportedly maintained the accident airplane. No airframe or engine logbooks were discovered for examination. No preimpact mechanical problems were discovered during the investigation. Federal Aviation Regulation Part 91.303, defines any abrupt change in an aircraft's attitude, an abnormal attitude, or abnormal acceleration not necessary for normal flight, as aerobatic flight.
The National Transportation Safety Board determines the probable cause(s) of this accident to be: The pilot's failure to maintain minimum airspeed to avoid a stall while maneuvering, which resulted in a loss of control, a stall/spin, and impact with terrain. Factors associated with the accident were an aerobatic maneuver, and a stall/spin. Full narrative available
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