ASN Wikibase Occurrence # 265663
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| Date: | Monday 19 July 2021 |
| Time: | 13:10 LT |
| Type: |  Grumman G-164B Tubo Ag-Cat |
| Owner/operator: | Thompson Aero Inc |
| Registration: | N8422K |
| MSN: | 80B |
| Year of manufacture: | 1976 |
| Engine model: | Honeywell TPE-331 |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | West of Amana Airport (C11), Amana, IA -
 United States of America
|
| Phase: | Initial climb |
| Nature: | Agricultural |
| Departure airport: | Amana, IA |
| Amana, IA | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot of the agricultural airplane reported that the airplane's engine lost power shortly after takeoff. The airplane settled into the corn field off the departure end of the runway and nosed over. The airplane sustained substantial damage to its left wing and fuselage.
All three propeller blades exhibited aft bending, bending opposite rotation, twisting toward low pitch and chordwise/rotational scoring predominately on the camber side which was consistent with impact at low power. Examination of the engine revealed a discontinuity in the drive system consisting of a broken torsion shaft. The broken torsion shaft is indicative of the engine operating at the time of impact. Examination of the fuel control unit and the propeller governor did not reveal any anomalies. No anomalies were found with respect to the engine, propeller, fuel control unit, or propeller governor that would explain the reported loss of engine power.
Based on the results of testing and examination, the reason for the reported loss of engine power could not be determined.
Probable Cause: The loss of engine power for reasons that could not be determined.
Accident investigation:
 |
|
Sources:
NTSB CEN21LA329
FAA register: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=N8422K
Location
Images:
Photo: Iowa County Sheriff's Office
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 20-Jul-2021 02:05 | Captain Adam | Added |
| 20-Jul-2021 02:58 | Geno | Updated [Location, Departure airport, Source] |
| 20-Jul-2021 06:17 | harro | Updated [Aircraft type, Photo] |
| 20-Jul-2021 13:37 | RobertMB | Updated [Time, Aircraft type, Registration, Cn, Operator, Departure airport, Source, Narrative] |
| 19-Aug-2023 08:30 | ASN Update Bot | Updated [[Time, Aircraft type, Registration, Cn, Operator, Departure airport, Source, Narrative]] |
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