NTSB Identification: CEN11LA571
14 CFR Part 137: Agricultural
Accident occurred Saturday, August 13, 2011 in Uvalde, TX
Probable Cause Approval Date: 01/17/2012
Aircraft: AIR TRACTOR INC AT-402, registration: N10119
Injuries: 1 Uninjured.

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 said he had just completed spraying a field during the aerial application flight when he noted that the airplane's global positioning system (GPS) unit had malfunctioned. As he attempted to troubleshoot the problem, the airplane’s engine power began to fluctuate. The pilot decided to make a precautionary landing. He looked inside the cockpit at the GPS, and, when he looked back outside, he noticed a set of power lines crossing the road. He was able to avoid them, then saw a second set of power lines. As he maneuvered the airplane to avoid them, he inadvertently stalled the airplane. The airplane’s right wing dropped and struck the power lines. The airplane then spun around and impacted terrain in an inverted attitude. A postaccident examination could not determine the reason for the drop in engine power. No other anomalies with the airplane were found.

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

The pilot’s failure to maintain airspeed while maneuvering to avoid power lines during a precautionary landing, which resulted an aerodynamic stall. Contributing to the accident was the fluctuating engine power for undetermined reasons and the pilot's preoccupation with the malfunctioning global positioning system.

Full narrative available

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