ATL93LA022 · Piper PA-18-150
Sky Signs Piper PA-18-150 · Accident: total loss of engine power (mechanical failure) en route
From Jim Hamilton L.B. Owens Airport (CUB) to Jim Hamilton L.B. Owens Airport (CUB)
Event
- NTSB case
- ATL93LA022
- 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
Piper PA-18-150
- Aircraft type
- Piper PA-18
- 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
- N9128D
- Operator
- Sky Signs
- Onboard fatalities
- Unknown
- Route
- From Jim Hamilton L.B. Owens Airport (CUB)To Jim Hamilton L.B. Owens Airport (CUB)
- 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 91: General Aviation
- 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
- En route · climb to cruise
- 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
- Substantial
Cause areas
- Fluid, fuel › Starvation
- Fuel system, carburetor float › Movement restricted
Approximate · Coordinates as recorded by the NTSB; no uncertainty radius is established.
NTSB narrative
THE PILOT COMPLETED REFUELING THE AIRPLANE AND TOOK OFF TO CONTINUE THE BANNER TOW OPERATION. DURING CLIMBOUT THE ENGINE LOST POWER; THE PILOT'S EFFORTS TO RESTORE NORMAL ENGINE OPERATION FAILED. THE PILOT ESTABLISHED AN EMERGENCY DESCENT TO A SOYBEAN FIELD FOR A FORCED LANDING; DURING THE TOUCHDOWN PHASE OF THE EMERGENCY, THE AIRPLANE NOSED OVER. THE POST ACCIDENT EXAMINATION OF THE AIRPLANE DISCLOSED THAT THE ENGINE OPERATED NORMALLY BETWEEN IDLE AND THE MAXIMUM RPM RANGES. HOWEVER, THE CARBURETOR EXAMINATION, DISCLOSED THAT THE FLOAT VALVE WOULD STICK IN THE CLOSED (FUEL OFF) POSITION. A REVIEW OF THE OPERATOR'S REFUELING POLICY REVEALED THAT A BLEND OF 100 LOW LEAD AVIATION FUEL AND AUTOMOTIVE GASOLINE WERE USED IN AIRPLANES GRANTED A SUPPLEMENTAL TYPE CERTIFICATE FOR AUTOMOTIVE FUEL. N9128D WAS GRANTED AN STC FOR THE USE OF AUTOMOTIVE FUEL.
Probable cause
THE LOSS OF ENGINE POWER WHICH RESULTED FROM FUEL STARVATION WHEN THE CARBURETOR FLOAT VALVE STUCK IN THE CLOSED POSITION. A FACTOR WAS THE SOFT FIELD .
Verbatim NTSB analysis and probable cause from the NTSB dataset
Sources
NTSB record ATL93LA022
- Event ID
- 20001211X15985
- Case number
- ATL93LA022
- 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: 073b3868b90a4a93bd4b840d12b9f7c168d9d6cf7d2775bb7da0a0da9e9fc356; retrieved 2026-09-23T02:29:44.454Z.