Cessna 206 incident near Portage, Alaska, June 13, 1993
On June 13, 1993 at about 6:10 pm local time, a Cessna 206, registered N4672U, suffered minor damage in an incident near Portage, Alaska. It was a flight of an unrecorded kind under charter and air-taxi rules (Part 135). No one was hurt; 3 people were on board or involved. The weather was visual conditions (good weather).
The NTSB's probable cause their words, unchanged
THE FAILURE OF THE NUMBER TWO CYLINDER CONNECTING ROD BEARING DUE TO THE SHIFTING OF THE BEARING WITHIN ITS JOURNAL RACE WHICH PRODUCED AN OIL STARVATION/THERMAL DISTRESS EVENT.
Source: NTSB aviation accident database, copy made October 5, 2026. Docket and reports at the NTSB.
What the record shows
- Date
- June 13, 1993 · about 6:10 pm local time
- Place
- Portage, Alaska · map
- Type
- Incident
- Injuries
- No one was hurt; 3 people were on board or involved.
- Weather
- visual conditions (good weather)
- Aircraft
- Cessna 206 · all 206s on the register
- Registration
- N4672U · no longer on the register · serial 20605046
- Damage
- Minor damage
- Flight
- Flight of an unrecorded kind · charter and air-taxi rules (Part 135)
The NTSB's narrative final · quoted from the NTSB record
DURING THE CRUISE CLIMB, THE ENGINE BEGAN TO EMIT METALLIC SOUNDS AND LOOSE POWER. A SUCCESSFUL OFF AIRPORT EMERGENCY LANDING WAS PERFORMED. DISASSEMBLY OF THE ENGINE REVEALED THAT THE NO. 2 CYLINDER CONNECTING ROD BEARING HAD SHIFTED WITHIN ITS JOURNAL RACE WHICH PRODUCED AN OIL STARVATION/THERMAL DISTRESS EVENT. THE CAUSE OF THE BEARING SHIFT COULD NOT BE DETERMINED.
The complete narrative as the NTSB published it. The NTSB's docket holds the report as a PDF and any photographs, statements and other documents from the investigation.
The factual record from the NTSB's investigation tables, in plain English
Pilot
- Certificate: commercial pilot
- Ratings: single-engine land; single-engine sea; instrument: airplane
- Flight time: 7,000 hours in all; 2,000 in this make and model; 269 in the last 90 days; 150 in the last 30 days; 6,800 as pilot in command
- Medical certificate: Class 2 (valid medical--no waivers/lim.)
- Seat: left
The aircraft
- Airframe total time: 5,567 hours
- Last inspection: annual inspection, June 1, 1993; 19 hours since
- Maximum gross weight: 3,600 lb
- Seats: 6
- Landing gear: fixed
- Engine: Continental IO520F (piston); 0 hours total
- Operator: Jim Air
The flight
- Departed from: LHD Lake Hood Sea AK at 12:50 pm
- Destination: Prince Wlm Snd AK
- Flight plan: VFR
- Runway 0
Weather at the time
- Light: daylight
- Visibility: 30 statute miles
- Sky: clear
- Temperature: 0°F (-18°C), dew point 0°F (-18°C)
Injuries
| Fatal | Serious | Minor | None | |
|---|---|---|---|---|
| Crew | 1 | |||
| Passengers | 2 |
Documents from the investigation the NTSB's docket: the evidence folder behind the report
The docket, the folder of records gathered during an investigation (maintenance records, photographs, witness statements, examinations), has not been read from the NTSB for this case yet; the list appears here once it has. Open the docket at the NTSB.
Everything on this page comes from the NTSB's public records. The narrative, probable cause and findings are the NTSB's own words; the coded tables behind the report are written out in plain English, with pilots' ages, home towns and medical details left out. The documents and photographs are the NTSB's docket, shown as the NTSB released them. This site's own text never names anyone involved. A preliminary report can change; the final report usually follows one to two years later, and the page is refreshed when it does.