NTSB Identification: FTW97LA009.
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Accident occurred Friday, October 04, 1996 in PUEBLO, CO
Probable Cause Approval Date: 08/21/1997
Aircraft: Young COZY MK IV, registration: N96PJ
Injuries: 1 Serious.
NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.
According to the pilot, he was practicing slow flight and stalls at 5,000 feet above ground level (10,000 feet msl). The only thing he could recall was that the 'main wing stalled' and that the canard was supposed to stall first. The nose pitched up, and he was unable to break the stall. After examining the wreckage, the airplane designer and an FAA airworthiness inspector concluded (1) the canard wing had too low an angle-of-incidence, (2) three of six vortilons had been removed from the main wing, (3) the pilot erroneously calculated the empty weight center of gravity (CG), making all other CG calculations incorrect, and (4) as fuel flowed towards the aft portion of the fuel tank during the stall, the CG moved 1.1 inches beyond the aft CG limit. The designer concluded that the aircraft had not been built according to the plans, but rather was 'converted' to an 'Aerocanard...an unauthorized, unapproved, rip-off design.' The pilot had about 400 hours of flight time in various Cozy aircraft, but he had accrued only about 17 hours in the Cozy MK IV.
The National Transportation Safety Board determines the probable cause(s) of this accident to be: the pilot/builder's improper design change which resulted in a loss of control following an intentional stall. A factor was an erroneous weight-and-balance calculation. Full narrative available
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