# NTSB ANC91LA066: Cessna 207A, N6255H, Eek, AK, June 6, 1991

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: June 5, 1991, 16:33 local (Jun 6, 1991, 00:33 UTC)
- Place: Eek, AK
- Coordinates: 60.809864, -161.849502 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=60.8099&lon=-161.8495&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 6 uninjured
- Status: Completed, report January 22, 1993
- Report: Approved by Office Director
- NTSB office: Alaska Regional Office
- NTSB case key (mKey): 5551
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC91LA066
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/5551/pdf
- Page: https://openairdocs.org/ntsb/ANC91LA066

## Probable cause

WAS FUEL CONTAMINATION.  CONTRIBUTING FACTORS ARE THE ENGINE VIBRATIONS AND THE ROUGH VEGETATION UPON WHICH THE AIRPLANE LANDED.

## Sequence of events

In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf).

- Loss of engine power(partial) - nonmechanical, cruise
  - fuel injection control/system - water (cause)
- Forced landing, descent - emergency
  - engine assembly - vibration (cause)
- On ground/water encounter with terrain/water, landing - roll
  - terrain condition - tundra (contributing factor)

## Analysis

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.

## Aircraft

- Registration: [N6255H](https://openairdocs.org/aircraft/N6255H), registered now, S/N 20700452 (OpenAirDocs)
- Reported make and model: CESSNA 207A
- Registry model: [Cessna 207A](https://openairdocs.org/model/cessna-207a) (registry code 2073604) (OpenAirDocs)
- Registry engine: [Continental IO-520 series](https://openairdocs.org/engine/continental-io-520-series) (registry code 17032, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 20700452
- Airframe hours: 6463
- Engines: CONTINENTAL IO-520-F 300 horsepower reciprocating
- Damage: Substantial damage
- Flight: Part 135
- Operator: Kusko Aviation, Inc.
- Registered owner: Kusko Aviation, Inc.
- Airworthiness certificate: Standard, Normal
- Last inspection: Annual, April 15, 1991, 78 hours before
- Departed: BET, BETHEL, AK
- Destination: KWN, QUINHAGAK, AK
- Flight plan: Company VFR
- Airport: EEK, Eek

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 47; commercial, flight instructor; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 2, valid medical--no waivers/lim.; seat: left; toxicology performed; flight hours: 1,679 total, 32 in this make and model, 1,609 as pilot in command, 79 in the last 90 days, 44 in the last 30 days, 2 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Visibility: 30 statute miles
- Lowest ceiling: none
- Temperature: 55 °F

## FAA reports on this event (1)

The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs).

- [Accident 19910605020119A](https://openairdocs.org/incident/19910605020119A), Jun 5, 1991: Cessna 207A, Eek, AK, Substantial damage. Force landed on tundra. Reported lost oil pressure and rough engine. No defects found except water in fuel.

## Other investigations on N6255H (2)

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [NTSB ANC90LA012](https://openairdocs.org/ntsb/ANC90LA012), Nov 7, 1989: Cessna 207 (N6255H), Quinhagak, AK, substantial damage. Probable cause: FATIGUE FAILURE OF THE RIGHT RUDDER BAR. A FACTOR RELATED TO THE ACCIDENT WAS: ROUGH/UNEVEN TERRAIN BESIDE THE RUNWAY.
- [NTSB ANC79FA060](https://openairdocs.org/ntsb/ANC79FA060), Jun 11, 1979: Cessna 207 (N6255H), Platinum, AK, substantial damage

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

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