- Date
- July 24, 1983, 21:30 local (Jul 25, 1983, 05:30 UTC)
- Place
- Near Iliamna, AK
- Injuries
- 3 uninjured
- Damage
- Substantial damage
- Phase of flight
- Initial climb
- Aircraft
- N4661ZCessna U206
- Weather
- Visual (VMC) · Day
- Status
- Completed
- Report
- Approved by Office Director
- NTSB office
- Alaska Regional Office
- Safety recommendations
- Yes
- FAA report
- 19830724037139A
- Case key
- 4042
From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.
On this page
Sequence of events
NTSB’s coding before 2008: each occurrence and phase of flight, and the causes and factors under it. The codes are defined in NTSB’s coding manual.
Analysis
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.
Aircraft
- Registration
- N4661Z
- Reported as
- Cessna U206
- Category
- Airplane
- Serial number
- U20605998
- Airframe hours
- 325
- Engine
- Continental IO-520-F, 300 horsepower, reciprocating
- Damage
- Substantial damage
- Flight
- Part 135
- Registered owner
- Rust'S Flying Service
- Airworthiness certificate
- Standard, Normal
- Last inspection
- 100 hour · July 13, 1983 · 31 hours before
- Destination
- Lake Clark, AK
- Flight plan
- Company VFR
Matched to the registry by N-number and the event date; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.
Flight crew
As NTSB recorded them. NTSB leaves out names.
- Role
- Pilot
- Age
- 37
- Certificate
- Commercial
- Airplane ratings
- Single-engine sea, Single-engine land
- Instrument ratings
- Airplane
- Medical
- Class 2, Valid Medical--no waivers/lim.
- Seat
- Left
- Flight hours
- 5,809 total · 1,869 in this make and model · 5,714 as pilot in command · 233 in the last 90 days · 3 in the last 24 hours
Weather
- Conditions
- Visual (VMC) · Day
- Wind
- 80° at 20 knots, gusting 25
- Visibility
- 5 statute miles
- Lowest ceiling
- 1,500 ft overcast
- 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.