aviation accident: Air Tractor AT-502B near Mendota (2004-07-23)
Probable cause: The pilot's inadequate preflight/pretakeoff procedure by not lowering the wing flaps, which resulted in an inadvertent stall as the pilot attempted to climb out of ground effect to clear a corn crop at the end of the runway. A factor in the accident was the failure, for undetermined reasons, of the flaps to deploy during the takeoff roll when the pilot moved the switch.