NTSB Identification: FTW97LA169.
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Accident occurred Saturday, April 19, 1997 in FLUVANNA, TX
Probable Cause Approval Date: 08/25/1997
Aircraft: Air Tractor AT-400, registration: N73127
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 was performing a swath run when he felt a vibration, and then the engine lost power. A forced landing was initiated to a plowed field. During the landing sequence, the left main landing gear separated from the fuselage, and the right wing spar was bent upward. A teardown inspection of the airplane's engine revealed that the reduction gear box failed and sheared the drive shaft. According to the FAA inspector, 'This failure allowed a turbine over speed to the point that the turbine blades separated from the wheel causing a contained catastrophic failure.'

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

The loss of engine power due to the failure of the reduction gear box. A factor was the lack of suitable terrain for the forced landing.

Full narrative available

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