NTSB Identification: FTW98FA299.
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Accident occurred Sunday, July 05, 1998 in LARKSPUR, CO
Probable Cause Approval Date: 02/15/2001
Aircraft: Grumman American AA-1A, registration: N9453L
Injuries: 1 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 265-hour private pilot filed a VFR flight plan from Boulder, Colorado, to Pueblo, Colorado, and requested VFR flight following services. Thirty minutes later, the pilot reported he was encountering 'moderate turbulence,' then 'quite a bit of turbulence,' that he was turning around, and requested flight following services back to Boulder. Shortly thereafter, the pilot advised he was in a spin and unable to correct and that he was turning off his transponder. The airplane struck the ground in a near-vertical attitude. There was no evidence of a spin. His logbook indicated he had never been demonstrated a spin or had been given spin instruction. The Pilot's Operating Handbook prohibits spins and states: 'There is evidence that permitting a spin to go beyond one turn without initiating proper recovery procedures can allow a spin mode to develop from which recovery is not possible.'
The National Transportation Safety Board determines the probable cause(s) of this accident to be: The pilot inadvertently stalling the airplane and entering an unrecoverable spin. A factor was clear air turbulence. Full narrative available
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