FTW99LA191 · Bell OH-58A
Bell OH-58A · Accident: total loss of engine power (non-mechanical) en route
From No airport to an unrecorded destination
Event
- NTSB case
- FTW99LA191
- 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
Bell OH-58A
- Aircraft type
- Bell OH-58
- Category
- Helicopter
- 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
- N9254R
- Operator
- Unknown
- Onboard fatalities
- Unknown
- Route
- From No airportTo 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
- En route · 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 (non-mechanical)
- 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
- Tree(s)
- 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
- Airport facilities, refueling truck/equipment › Other
- Fuel system, tank › Contamination, water
Approximate · Coordinates as recorded by the NTSB; no uncertainty radius is established.
NTSB narrative
The helicopter experienced a total loss of engine power due to a contaminated fuel system. Days prior to the accident flight, the refueling truck had been contaminated with water, and the accident helicopter had been filled with the contaminated fuel. The pilot and ground crew became aware of the situation and sumped both the truck and the helicopter. The pilot thought that the helicopter's fuel system was free of the contaminated fuel. During the accident flight, the engine lost power, the pilot initiated an autorotation, and the helicopter impacted pine trees. The FAA inspector observed water and algae in the helicopter's fuel filters. The operator stated that the refueling truck's water filter failed to separate the water from the fuel during the fueling operations. After the accident, the operator installed water/fuel separators in all the refueling trucks in addition to the filters that were already in place as an extra measure of safety.
Probable cause
The failure of the refueling truck's filter to separate water resulting in the water contamination in the helicopter's fuel system and subsequent loss of engine power. A factor was the lack of suitable terrain for the forced landing.
Verbatim NTSB analysis and probable cause from the NTSB dataset
Sources
NTSB record FTW99LA191
- Event ID
- 20001212X19271
- Case number
- FTW99LA191
- 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: e51ad0efdc39a8146b2f5b16f0a48674d642ad968f44cc8efee2b1ebe83bee21; retrieved 2026-09-22T14:30:44.300Z.