NTSB Identification: FTW00LA118.
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Accident occurred Thursday, April 06, 2000 in OAK GROVE, LA
Probable Cause Approval Date: 01/18/2001
Aircraft: Ayres S2R-G6, registration: N3004V
Injuries: 1 Uninjured.

NTSB investigators may have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

The pilot reported that during the aerial application flight, the engine 'lost torque while spraying at ground level.' The pilot diverted to an adjacent open field for the forced landing. During the landing roll, the main landing gear sank in the wet field, and the airplane nosed over to the inverted position. An engine teardown revealed a failure of the spur gear from the torque sensor gear assembly. The Garrett TPE 331 engine had accumulated 8,395 flight hours since the last major overhaul. Total flight time since a hot section and gearbox change was 793 hours.

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

The failure of a spur gear from the torque sensor gear assembly resulting in a loss of engine power. A factor was the muddy terrain encountered during the forced landing.

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