ASN Wikibase Occurrence # 214236
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| Date: | Tuesday 7 August 2018 |
| Time: | 11:15 LT |
| Type: |  Cessna 207A Stationair 7 |
| Owner/operator: | Iliamna Air Taxi Inc |
| Registration: | N7379U |
| MSN: | 20700427 |
| Year of manufacture: | 1978 |
| Total airframe hrs: | 18642 hours |
| Engine model: | Continental IO 520 SERIES |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Iliamna, Lake and Peninsula Borough, AK -
 United States of America
|
| Phase: | Initial climb |
| Nature: | Unknown |
| Departure airport: | Iliamna, AK |
| Kokhanok, AK (9K2) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot reported that shortly after takeoff, as he began to configure the airplane for cruise flight, the engine began to run rough and lose power, and he elected to immediately return to the airport. The engine subsequently lost total power and the pilot performed a forced landing on tundra-covered terrain, during which the airplane sustained substantial damage.
Examination revealed that the No. 2 piston was eroded on the bottom side, and a hole was burned through. The No. 2 piston and cylinder head were mechanically damaged by loose piston ring debris. Closer examination of the No. 2 cylinder head revealed re-solidified molten metal around the bottom Heli-Coil tang notch. All damage discovered was consistent with a pre-ignition/detonation event; however, the cause of the pre-ignition and/or detonation could not be determined based on the available information.
Probable Cause: A total loss of engine power due to detonation/preignition damage of the No. 2 cylinder and piston for reasons that could not be determined.
Accident investigation:
 |
|
Sources:
NTSB ANC18LA064
FAA register: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=N7379U
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 08-Aug-2018 18:13 | Captain Adam | Added |
| 08-Aug-2018 20:20 | Iceman 29 | Updated [Source, Narrative] |
| 08-Aug-2018 20:36 | Aerossurance | Updated [Nature, Narrative] |
| 09-Aug-2018 00:12 | Geno | Updated [Aircraft type, Total occupants, Location, Nature, Departure airport] |
| 02-Jul-2022 17:49 | ASN Update Bot | Updated [Time, Other fatalities, Departure airport, Destination airport, Source, Narrative, Category, Accident report] |
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