ASN Wikibase Occurrence # 277696
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| Date: | Monday 28 September 2020 |
| Time: | 16:30 |
| Type: |  Thrush S2R-H80 Turbo Thrush |
| Owner/operator: | |
| Registration: | N6216K |
| MSN: | H80-182 |
| Year of manufacture: | 2016 |
| Total airframe hrs: | 2758 hours |
| Engine model: | GE Aviation H80-100 |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Minor |
| Category: | Incident |
| Location: | 7 mls NW of Donalsonville Municipal Airport, GA (17J) -
 United States of America
|
| Phase: | Approach |
| Nature: | Agricultural |
| Departure airport: | Donalsonville Municipal Airport, GA (17J) |
| Donalsonville Municipal Airport, GA (17J) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
A Thrush S2R-H80, N6216K, powered by one General Electric Aviation Czech H80-100 turboshaft engine, was involved in an incident approximately seven miles northwest of Donalsonville Municipal Airport (17J), Georgia. According to the pilot, he departed 17J at 1600 EDT with 350 gallons of pesticide to spray peanut fields. While maneuvering to re-enter a field, he reported that the “engine came apart” and he force landed the airplane in the peanut field. During landing, the landing gear sunk into the wet field and the airplane nosed over.
The incident engine suffered a release of low-energy power turbine blade debris due to a power turbine overspeed event. One or more hex nuts that secure the torque meter support within the reduction gearbox came loose and backed off from its threaded stud. A loose nut then became wedged between the mating teeth of the stage 2 planetary gears and crown wheel and the sudden torque shock caused teeth to fracture on one stage 1 planetary gear. Once these teeth fractured, mis-meshing between the stage 1 planetary gears and the sun gear occurred resulting in the 360° fracture and liberation of the sun gear teeth. The reduction gearbox then became
decoupled from the power turbine, allowing for overspeed to occur
Probable Cause and Findings:
A total loss of engine power due to a loose torque meter attachment nut in the reduction gearbox that jammed the planetary gearset causing the power turbine shaft to separate from the power turbine disk, resulting in the power turbine overspeeding and shedding blades that penetrated the compressor turbine case.
Accident investigation:
 |
|
Sources:
https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/102067/pdf
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 27-Apr-2022 19:36 | harro | Added |
Corrections or additions? ... Edit this accident description
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