NTSB Identification: SEA96LA115.
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Accident occurred Friday, June 07, 1996 in TOOELE, UT
Probable Cause Approval Date: 05/23/1997
Aircraft: Cessna 172M, registration: N9594V
Injuries: 3 Minor.
NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.
The pilot stated that just after takeoff, the airspeed began decreasing, the stall warning horn sounded, and the airplane started sinking despite attempts at corrective action. The airplane impacted the ground beyond the departure end of the runway. Density altitude was 6,385 feet. A videotape, filmed by a rear-seat passenger, showed that the aircraft reached a pitch attitude of up to 24 degrees nose-high after takeoff. It also recorded a sound, resembling the stall warning horn, 42 seconds after start of takeoff roll (about 18 to 19 seconds after becoming airborne), and it recorded no significant change in engine noise pitch during the event. The airplane's electrical flap switch demonstrated improper mechanical operation 'due to normal wear' during postaccident functional testing. Investigation revealed that the pilot took off uphill to the south (average runway slope was 0.81 percent). The FAA's regional airport master record and the Utah state aeronautical chart wrongly indicated that the runway sloped uphill to the north, rather than to the south. The Airport/Facility Directory (A/FD) gave no runway slope data for the airport; the A/FD legend stated that the runway slope would be shown 'only when it is 0.3 percent or more.'
The National Transportation Safety Board determines the probable cause(s) of this accident to be: failure of the flight instructor (CFI) to ensure that adequate airspeed was maintained during initial climb after lift-off, which resulted in an inadvertent stall/mush. High density altitude was a related factor. Full narrative available
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