ATL99LA017 · Grumman-Schweizer G164B
Thrash Viation Grumman-Schweizer G164B · Accident: total loss of engine power (mechanical failure) while maneuvering
From Lower Chattahoochee Regional Airport (25J) to an unrecorded destination
Event
- NTSB case
- ATL99LA017
- Event typeAccident: someone killed or seriously injured, or the aircraft substantially damaged (NTSB definition). Incident: an occurrence that affected or could have affected safety, short of that. Glossary
- Accident
- InvestigationHow far the investigation had got when the record was published: preliminary, ongoing, final or completed. Unknown where the source does not say. Glossary
- Completed
- API-reported fatalities
- 0 · all aircraft and ground
- Ground fatalities
- 0
- OperationWhat kind of flying it was, grouped by the rules it flew under: airline (US Part 121), air taxi and commuter (Part 135), general aviation (Part 91 and similar), military or government. Glossary
- General aviation
- WeatherVisual meteorological conditions (VMC): good enough to fly by looking outside. Instrument conditions (IMC): cloud or low visibility, flying by instruments. Glossary
- Visual Meteorological Cond
Grumman-Schweizer G164B
- Aircraft type
- Grumman Schweizer G164
- Category
- Airplane
- RegistrationThe aircraft's tail number, such as N12345 or G-ABCD. Registrations are reissued, so the same one years apart can be a different aircraft. Glossary
- N6656Q
- Operator
- Thrash Viation
- Onboard fatalities
- Unknown
- Route
- From Lower Chattahoochee Regional Airport (25J), GATo not recorded
- Aircraft age
- Not recorded
- Flight rulesThe regulations the flight operated under: in the US, Part 91 (general aviation), Part 121 (airlines), Part 135 (air taxi and commuter) and others; for flights abroad, the NTSB's coarser commercial or non-commercial code. Glossary
- Part 137: Agricultural
- Phase of flightThe stage of the flight when things started to go wrong: standing, taxi, takeoff, initial climb, en route, maneuvering, approach or landing. Glossary
- Maneuvering · aerial application
- First occurrenceThe single coded event the NTSB judges best describes what happened (records from 2008 on). Older records name the first occurrence in the sequence instead. Glossary
- Total loss of engine power (mechanical failure)
- Also codedOther events the NTSB coded in the sequence, such as a wire strike after a loss of power. Flight Findings uses them for its kinds of event. Glossary
- Fuel starvation
- DamageDestroyed: beyond practical repair. Substantial: damage that affects the structure, performance or handling and normally needs major repair. Minor: less than that. Glossary
- Destroyed
Cause areas
- Fluid, fuel › Starvation
- Fuel system, pump › Failure, total
- Reduction gear assembly, accessory drive shaft › Fatigue
Approximate · Estimated position: the centre of Cuthbert, GA, the place the record names. Not the accident site.
NTSB narrative
According to the pilot, the airplane's engine lost power while positioning to conduct agricultural operations. The Pilot made an off airport emergency landing in a field. The airplane collided with tree stumps and nosed over. During engine examination, there was a fatigue fracture found in the fuel control gearshaft. It was discovered that both fuselage and engine fuel filters were clogged. There was no Supplemental Type Certificate (STC) for the installation of the engine into this airplane.
Probable cause
The fatigue failure of the accessory gear shaft which resulted in fuel starvation and the loss of engine power. A factors was the fuel system filter restriction.
Verbatim NTSB analysis and probable cause from the NTSB dataset
Sources
NTSB record ATL99LA017
- Event ID
- 20001211X11366
- Case number
- ATL99LA017
- Dataset
- historical-pre2008
- Source SHA-256
- 89e2df6d848e7ab3b42e7d7c7a03ff403303057a26ca04c95b3ea67201c3ce74
Source notes (4)
- Unreviewed is an editorial label, not an investigation status. API-sourced is not report-checked or human-reviewed. Explicit event totals are used without summing aircraft injury tables; onboard allocation is withheld. Unknown values remain unknown. The operation category is mapped from the NTSB-reported FAR part and has not been reviewed.
- Filled from the NTSB case API where the bulk record had no value: investigation status. Values present in the bulk record are kept.
- The date is the local date, which is the same as the UTC date the NTSB stores.
- API snapshot SHA-256: 091ad5f7ce6b2b5df0af43d64e259fcd78f7cf15cc1b23e0608f7fc6218ec713; retrieved 2026-09-21T20:39:16.277Z.