Cessna 206 N8070Z
2 September 1992 · Fort Yukon, Alaska, United States · Serious injuries
Summary
On 2 September 1992 at about 01:42 local time, a Cessna 206 registered N8070Z, operated by Larry R. Rivers, was involved in an accident near Fort Yukon, Alaska, United States. 3 people were on board and one was seriously injured, one had minor injuries. The aircraft was substantially damaged. The NTSB has published a probable cause for this accident; it is quoted in full below.
The record
- Date
- at 01:42
- Classification
- Accident
- Location
- Fort Yukon, Alaska, United States
- Coordinates
- 66.5603, -145.2492
- Aircraft
- Cessna 206
- Registration
- N8070Z
- Category
- Airplane
- Engines
- 1
- Operator
- Larry R. Rivers
- Operating rule
- Part 91: General Aviation
- Purpose of flight
- Business
- Phase of flight
- Not recorded
- Route
- Red Sheep Creek → Unknown
- Aircraft damage
- Substantial
- Weather
- VMC
- Light
- Day
- NTSB number
- ANC92LA152
People
1 person was seriously injured.
| On board | Died | Serious | Minor | Uninjured |
|---|---|---|---|---|
| 3 | 0 | 1 | 1 | 1 |
Probable cause
FATIGUE FAILURE OF AN ENGINE CYLINDER PRECIPITATED BY THE PILOT-IN-COMMAND INTENTIONALLY EXCEEDING THE ENGINE PERFORMANCE RATINGS IN ORDER TO SUSTAIN FLIGHT IN THE GROSSLY OVERWEIGHT CONDITION. A FACTOR CONTRIBUTING TO THE ACCIDENT WAS THE HIGH GRASS. A FACTOR CONTRIBUTING TO THE SEVERITY OF THE PASSENGER'S INJURY WAS THE UNSECURED CARGO.
Quoted verbatim from the NTSB record. This site does not paraphrase or interpret it.
Read the full NTSB narrative
THE PILOT LOADED THE 2 PASSENGERS AND GEAR IN THE AIRPLANE TO THE EXTENT THAT IT TOOK SUCCESSIVE ATTEMPTS TO CLOSE THE DOOR DUE TO THE GEAR WHICH 'FILLED UP THE AIRPLANE TO THE ROOF.' THE REAR PAX HAD TO LAY ON TOP OF MEAT AND CAMP SUPPLIES WITH 2 DOGS IN HIS LAP. THE AIRPLANE WAS ESTIMATED TO BE 772 LBS OVER MAX GROSS WEIGHT AT TAKEOFF. AFTER TAKEOFF THE AIRPLANE CLIMBED SLOWLY FOR APRX 55 MIN AT TAKEOFF POWER. A 'SLEDGEHAMMER' SOUND PRECEDED THE APPEARANCE OF OIL FLOWING INTO THE CABIN AREA. NO REDUCTION OF POWER WAS OBSERVED. THE OIL PRESSURE BEGAN DROPPING RAPIDLY, AND THE PILOT MADE A PRECAUTIONARY LANDING ON A BEACH. THE AIRPLANE NOSED OVER IN GRASS. ENGINE TEARDOWN EXAMINATION REVEALED THAT THE #6 CYLINDER HAD FAILED THROUGH THE HEAD-TO-BARREL THREADED JOINT. METALLURGICAL EXAMINATION REVEALED THAT THE FAILURE WAS THE RESULT OF FATIGUE CRACKING IN THE CYLINDER HEAD CASTING. THIS TYPE OF FAILURE OCCURS WHEN THE CYLINDER IS OPERATED AT ELEVATED TEMPERATURES (ABOVE MAXIMUM ALLOWABLE) FOR A CONSIDERABLE PERIOD OF TIME.
Quoted verbatim from the NTSB record.
Other Cessna 206 accidents
| Date | Aircraft | Location | Operator | Outcome | Died |
|---|---|---|---|---|---|
| 26 Aug 1992 | Cessna 206 | Fairbanks, Alaska, United States | - | No injuries | - |
| 16 Sep 1992 | Cessna 206 | Chena Marina, Alaska, United States | Bill A. Jones | No injuries | - |
| 21 Jul 1992 | Cessna 206 | Bethel, Alaska, United States | Department of Fish & Wildlife | Unknown | - |
| 16 Aug 1992 | Cessna 206 | Shishmaref, Alaska, United States | U.s. Dept of Interior | Unknown | - |
| 2 Oct 1992 | Cessna 206U | Lime Village, Alaska, United States | Woods, Warren | No injuries | - |
| 23 Oct 1992 | Cessna 206 | Slate Creek, Alaska, United States | Thoreson, Oscar B. | No injuries | - |
Other accidents in this area
| Date | Aircraft | Location | Operator | Outcome | Died |
|---|---|---|---|---|---|
| 13 Feb 1992 | Piper PA-18A-150 | Anchorage, Alaska, United States | John Clark | Minor injuries | - |
| 12 Feb 1992 | Richard C Ballow KITFOX 1 | Valdez, Alaska, United States | Jones, William Marshall | No injuries | - |
| 17 Feb 1992 | Aeronca 7AC | Sitka, Alaska, United States | Diment, Archie G. | No injuries | - |
| 9 Oct 1992 | Champion 7EC | Chugiak, Alaska, United States | - | Fatal | 1 |
| 14 Feb 1992 | Cessna 180 | Shishmaref, Alaska, United States | Sheldon, Robert J. | Serious injuries | - |
| 19 Feb 1992 | Cessna 185F | Pelican, Alaska, United States | Bellair, Inc. | Minor injuries | - |