NTSB Identification: FTW00LA008.
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Accident occurred Thursday, October 07, 1999 in BAY CITY, TX
Probable Cause Approval Date: 05/30/2001
Aircraft: Air Tractor AT-502B, registration: N61768
Injuries: 1 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 completed the 8th seeding pass over a field and was turning to make the 9th pass when the agricultural airplane shuddered and made three uncommanded banks prior to impacting the terrain. The pilot initially stated that he flew through his own wake turbulence and stalled the airplane while in a 60-degree bank to the right. However, the pilot later stated that he thought the propeller may have malfunctioned resulting in the loss of airplane control. Post-accident examination of the airplane flight controls and the propeller revealed no anomalies that would have prevented normal operation of the aircraft prior to the accident.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

The pilot's inadvertent stall. A factor was the pilot's encounter with the airplane's wake turbulence.

Full narrative available

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