NTSB ANC91LA066 — 1991-06-05 · EEK, Alaska, United States

Current FAA registration · N6255H

Make / Model: CESSNA 207A
Engine: CONT MOTOR IO 520 SERIES (285 hp)
Seats / Engines: 7 seats · 1 engine
Last airworthiness date: 19940624
ADS-B equipped: Yes — Mode-S A82BDF

Source: FAA Aircraft Registry (releasable master file).

Aircraft involved

N6255H Cessna 207A None

Probable cause & findings

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

Factual 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. Source: NTSB Aviation Accident Database (Pre-2008 Archive) Retrieved: 2026-02-12

Verbatim from NTSB's published report. Source file NTSB_1991_ANC91LA066.txt. Findings + structured fields enriched from FAA avall.mdb. Full investigation docket on data.ntsb.gov ↗.

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External sources are reported, not agency: signal that something happened, not fact about what happened.

Related research

Matched on aircraft type or causal vocabulary (fuel contamination). All research papers

NASA NTRS 2019 · Conference Paper Combined Contamination and Space Environmental Effects on Solar Cells and Thermal Control Surfaces

For spacecraft in low Earth orbit (LEO), contamination can occur from thruster fuel, sputter contamination products and from products of silicone degradation.