Kusko Aviation Cessna 207A accident
Cessna 207A · Accident: partial loss of engine power (non-mechanical) en route
From Bethel Airport (BET) to Quinhagak Airport (KWN)
Event
- NTSB case
- ANC91LA066
- 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
- Charter & commuter
- 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
Cessna 207A
- Aircraft type
- Cessna 207
- 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
- N6255H
- Operator
- Kusko Aviation
- Onboard fatalities
- Unknown
- Route
- From Bethel Airport (BET), Bethel, AKTo Quinhagak Airport (KWN), Quinhagak, AK
- 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 135: Air Taxi & Commuter
- 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
- Partial loss of engine power (non-mechanical)
- 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
- Engine assembly › Vibration
- Fuel injection control/system › Water
Approximate · Coordinates as recorded by the NTSB; no uncertainty radius is established.
NTSB narrative
THE PILOT-IN-COMMAND STATED THAT THE FUEL FLOW BEGAN TO FLUCTUATE AND THE ENGINE BEGAN TO RUN ROUGH. HE SWITCHED FUEL TANKS AND THE ENGINE SMOOTHED OUT. HE THEN SWITCHED BACK TO THE ORIGINAL FUEL TANK AND HE STATED THE ENGINE OIL PRESSURE WENT TO ZERO AND THE ENGINE BEGAN TO VIBRATE. HE ELECTED TO SHUT DOWN THE ENGINE AND EXECUTE A FORCED LANDING. SUBSEQUENT EXAMINATION REVEALED THAT THE ENGINE OIL PUMP WAS WORKING, THAT THERE WAS A SUFFICIENT OIL QUANTITY IN THE ENGINE AND THAT THERE WAS WATER IN THE FULE INJECTOR DISTRIBUTOR.
Probable cause
WAS FUEL CONTAMINATION. CONTRIBUTING FACTORS ARE THE ENGINE VIBRATIONS AND THE ROUGH VEGETATION UPON WHICH THE AIRPLANE LANDED.
Verbatim NTSB analysis and probable cause from the NTSB dataset
Sources
NTSB record ANC91LA066
- Event ID
- 20001212X17142
- Case number
- ANC91LA066
- 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: local date, investigation status. Values present in the bulk record are kept.
- The date is the local date; the NTSB stores the UTC date 1991-06-06.
- API snapshot SHA-256: 10f02eac47a4d9e3ecdeba346ed76c0dc2ac9ccc65615aed74aae14e2662fb83; retrieved 2026-09-18T18:54:36.185Z.