Cessna U206 N4661Z
25 July 1983 · Near Iliamna, Alaska, United States · No injuries
Summary
On 25 July 1983 at about 05:30 local time, a Cessna U206 registered N4661Z was involved in an accident near Near Iliamna, Alaska, United States. 3 people were on board and nobody was injured. The aircraft was substantially damaged. No probable cause statement is available for this record.
The record
- Date
- at 05:30
- Classification
- Accident
- Location
- Near Iliamna, Alaska, United States
- Coordinates
- 59.8509, -154.5592
- Aircraft
- Cessna U206
- Registration
- N4661Z
- Category
- Airplane
- Engines
- 1
- Operator
- Not recorded
- Operating rule
- Part 135: Air Taxi & Commuter
- Purpose of flight
- Unknown
- Phase of flight
- Not recorded
- Route
- Unknown → Lake Clark
- Aircraft damage
- Substantial
- Weather
- VMC
- Light
- Day
- NTSB number
- ANC83FA131
People
Nobody was injured.
| On board | Died | Serious | Minor | Uninjured |
|---|---|---|---|---|
| 3 | 0 | 0 | 0 | 3 |
Probable cause
The NTSB has not published a probable cause for this record. No probable cause statement is present in the source data.
Nothing about the cause is stated here that is not in the source record.
Read the full NTSB narrative
THE ENG LOST POWER JUST AFTER A WATER TAKEOFF. THE ACFT LANDED STRAIGHT AHEAD IN MUSKEG & TUNDRA COLLAPSING THE FLOATS. ENG TEARDOWN REVEALED A METALLIC 'NUGGET' IN THE LEFT INTAKE MANIFOLD BETWEEN THE #4 & #6 PORTS. NUMEROUS MARKS WERE FOUND ON THE INSIDE OF BOTH INTAKE MANIFOLDS. THERE WAS MINOR DENTING, SCRATCHING & PEENING ON THE INTERIOR OF THE 90 DEG ELBOWS FROM BOTH ENDS OF THE CROSSOVER TUBE, INTAKE VALVE PORTS, SEATS & VALVE FACES OF CYLS 4,5 & 6. THE NUGGET WAS COMPOSED OF THE SAME MATERIAL AS THE AIRBOX ASS'Y, CESSNA P/N 1250705, WHICH CONTAINED TWO HOLES APRX 2-1/2 SQUARE INCHES EACH IN THE AIRBOX WALL. THE HOLES WERE CAUSED BY FATIGUE CRACKS. THE SOURCE OF LOADING CAUSING THE FATIGUE CRACKPROPAGATION WAS DUE TO MEMBRANE &/OR BENDING LOADS IN THE AIRBOX WALL CAUSED BY OUT-OF-PLANE DEFORMATION. THESE DEFORMATION WERE MOST LIKELY CAUSED BY EXCITING A NATURAL MODE OF VIBRATION IN THE WALL. THREE DUCT FAILURES WERE REPORTED TO THE FAA IN 1983, TWO OF WHICH WERE IN C-210 ACFT.
Quoted verbatim from the NTSB record.
Other Cessna U206 accidents
| Date | Aircraft | Location | Operator | Outcome | Died |
|---|---|---|---|---|---|
| 22 May 1983 | Cessna U206 | South Prairie, Washington, United States | - | Fatal | 1 |
| 25 Jun 1983 | Cessna U206 | Cortez, Colorado, United States | - | Fatal | 2 |
| 29 Apr 1983 | Cessna U206 | Mexican Hat, Utah, United States | C & C Construction | No injuries | - |
| 6 May 1983 | Cessna U206 | Terre Haute, Indiana, United States | - | No injuries | - |
| 8 May 1983 | Cessna U206 | Twin Hills, Alaska, United States | - | No injuries | - |
| 16 Jun 1983 | Cessna U206 | Billings, Montana, United States | - | Minor injuries | - |
Other accidents in this area
| Date | Aircraft | Location | Operator | Outcome | Died |
|---|---|---|---|---|---|
| 8 Jun 1983 | Cessna 182 | Bettles, Alaska, United States | John Pletting | No injuries | - |
| 19 Jun 1983 | Piper PA-18 | Squaw Lake, Alaska, United States | - | No injuries | - |
| 24 Jun 1983 | Piper PA-18 | Palmer, Alaska, United States | - | No injuries | - |
| 27 Jun 1983 | Piper J-3 | Skwentna, Alaska, United States | - | Minor injuries | - |
| 26 Jun 1983 | Cessna 170 | Fairbanks, Alaska, United States | - | No injuries | - |
| 28 Jun 1983 | Cessna 180 | King Salmon, Alaska, United States | - | No injuries | - |