NTSB Identification: CEN10LA353
14 CFR Part 137: Agricultural
Accident occurred Monday, June 14, 2010 in Penrose, AR
Probable Cause Approval Date: 11/17/2011
Aircraft: AIR TRACTOR INC AT-602, registration: N4257R
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.

While approximately 75 feet above the ground, the airplane experienced a partial loss of engine power. Unable to maintain altitude, the pilot performed a forced landing to a wet rice field. During the landing, the airplane impacted a dirt mound, nosed over, and came to rest inverted. During the postaccident engine examination, the fuel control unit was removed and a functional test of the unit performed. The test revealed that the fuel unit's evacuated bellows had developed a fatigue crack in the outer ply surface. This crack would have resulted in a reduced fuel flow to the engine and a subsequent loss of engine power. Laboratory analysis concluded that the crack had originated in an area of several corrosion pits. The cause of the corrosion could not be determined.

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

The loss of partial engine power due to a fatigue crack in the engine's fuel control bellows.

Full narrative available

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