Accident Sequence
The aircraft was observed departing on Runway 35 of a 4,250-foot private agricultural strip after being loaded to near capacity with 46% nitrogen fertilizer. After lift-off, the aircraft crossed a fence that ran parallel to the runway and then struck a fence perpendicular to the north end of the runway. Following the fence strike, the aircraft settled to the ground in an adjacent pasture.
Impact with Ground Equipment
The aircraft's right wing struck and rode up over a land plane. Subsequently, the aircraft struck a series of rice harrows that were supported by a barrel. The aircraft then flipped over and slid to a stop inverted.
Pilot Injuries and Shoulder Harness Findings
The pilot received serious head and neck injuries. Examination of the shoulder harness support mount revealed that it had separated and exhibited extensive corrosion. Evidence indicated that the corrosion had been previously treated.
Performance Factors
Data indicated that the aircraft departed with an 11-knot tail wind on the grass strip. This tail wind increased the takeoff roll by 65%, or approximately 1,000 feet to 2,235 feet. The pilot initiated dumping of the load after lift-off at midfield.