BFO92FA144 · Hughes 269C
Helicopters Hughes 269C · Accident: airframe, component or system failure en route
From Winchester, KY to an unrecorded destination
Event
- NTSB case
- BFO92FA144
- 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
- 2 · 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
Hughes 269C
- Aircraft type
- Hughes 269
- 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
- N9609F
- Operator
- Helicopters
- Onboard fatalities
- Unknown
- Route
- From Winchester, KYTo 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 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
- Airframe, component or system failure
- 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
- Company maintenance personnel › Maintenance, inadequate
- Rotor drive system, clutch assembly › Chafed
Approximate · Coordinates as recorded by the NTSB; no uncertainty radius is established.
NTSB narrative
THE HELICOPTER WAS ON A LOW ALTITUDE POWERLINE PATROL WHEN IT DESCENDED AND COLLIDED WITH UPSLOPING TERRAIN. THE INVESTIGATION REVEALED THE CLUTCH SPRING ASSEMBLY WAS FRACTURED, INVOLVING THE ASSEMBLY RETAINER END WHICH SEPARATED. THE RETAINER WALL WAS SEVERELY WORN WHERE THE SEPARATION OCCURRED. THE ASSEMBLY FUNCTIONS TO ENGAGE THE BELT DRIVE SYSTEM WHICH IN TURNS TRANSMITS ENGINE POWER TO THE MAIN TRANSMISSION. THE HELICOPTER HAD OVER 11,000 HOUR OF TOTAL TIME. THE LAST INSPECTION OF THE ASSEMBLY WAS ABOUT A MONTH EARLIER, DURING A 100 HOUR INSPECTION. A REVIEW OF MAINTENANCE RECORDS REVEALED NO PREVIOUS REPLACEMENT OF THE ASSEMBLY.
Probable cause
INADEQUATE MAINTENANCE INSPECTION INVOLVING FAILURE TO DETECT WEAR OF THE CLUTCH SPRING ASSEMBLY, RESULTING IN THE UNCOUPLING OF ENGINE POWER TO THE MAIN TRANSMISSION.
Verbatim NTSB analysis and probable cause from the NTSB dataset
Sources
NTSB record BFO92FA144
- Event ID
- 20001211X15606
- Case number
- BFO92FA144
- 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: 4557773aca755034edd438f6b8c4772db4ab95ee14b95d59e57bc3359f15423d; retrieved 2026-09-21T00:55:13.739Z.