ANC24LA045 · Cessna 206
Egli Air Haul Service Cessna 206 · Accident: loss of engine power (partial) during an emergency descent
From King Salmon Airport (PAKN) to Igiugig Airport (PAIG)
Event
- NTSB case
- ANC24LA045
- Event typeAccident: someone killed or seriously injured, or the aircraft substantially damaged (NTSB definition). Incident: an occurrence that affected or could have affected safety, short of that. Glossary
- Accident
- InvestigationHow far the investigation had got when the record was published: preliminary, ongoing, final or completed. Unknown where the source does not say. Glossary
- Completed
- API-reported fatalities
- 0 · all aircraft and ground
- Ground fatalities
- 0
- OperationWhat kind of flying it was, grouped by the rules it flew under: airline (US Part 121), air taxi and commuter (Part 135), general aviation (Part 91 and similar), military or government. Glossary
- General aviation
- WeatherVisual meteorological conditions (VMC): good enough to fly by looking outside. Instrument conditions (IMC): cloud or low visibility, flying by instruments. Glossary
- Visual Meteorological Cond
Cessna 206
- Aircraft type
- Cessna 206
- Category
- Airplane
- RegistrationThe aircraft's tail number, such as N12345 or G-ABCD. Registrations are reissued, so the same one years apart can be a different aircraft. Glossary
- N756CL
- Operator
- Egli Air Haul Service
- Onboard fatalities
- Unknown
- Route
- From King Salmon Airport (PAKN), King Salmon, AKTo Igiugig Airport (PAIG), Igiugig, AK
- Aircraft age
- About 47 years (built 1977)
- Flight rulesThe regulations the flight operated under: in the US, Part 91 (general aviation), Part 121 (airlines), Part 135 (air taxi and commuter) and others; for flights abroad, the NTSB's coarser commercial or non-commercial code. Glossary
- Part 91: General Aviation
- Phase of flightThe stage of the flight when things started to go wrong: standing, taxi, takeoff, initial climb, en route, maneuvering, approach or landing. Glossary
- Emergency descent
- Defining eventThe single coded event the NTSB judges best describes what happened (records from 2008 on). Older records name the first occurrence in the sequence instead. Glossary
- Loss of engine power (partial)
- DamageDestroyed: beyond practical repair. Substantial: damage that affects the structure, performance or handling and normally needs major repair. Minor: less than that. Glossary
- Substantial
Cause areas
- Aircraft › Aircraft power plant
- Not determined › Not determined
Approximate · Coordinates from the NTSB case API, which marks them as estimated or does not say; no uncertainty radius is established.
NTSB narrative
The pilot reported that, shortly after takeoff, he observed high engine oil temperature and began to turn back to the airport. The engine began losing power, and the pilot performed a forced landing in the tundra, which resulted in substantial damage to the horizontal stabilizer and elevator. Examination of the engine revealed that the No. 1 piston was eroded down to the steel ring lands and scuff marks were observed on the side of the piston skirt. The No. 1 cylinder upper and lower spark plugs had molten aluminum deposits covering the electrodes and insulators. The crankshaft rod journals exhibited evidence of foreign material contamination in the oil. The Nos. 2 and 5 crankshaft rod journals had severe thermal discoloration. All connecting rod bearings exhibited abnormal wear. Connecting rod bearings No. 2 and 5 were severely damaged. The observed damage was consistent with a detonation/pre-ignition event; however, the reasons for the detonation/pre-ignition could not be determined based on the available information.
Probable cause
A partial loss of engine power due to detonation/preignition of the No. 1 cylinder for reasons that could not be determined.
Verbatim NTSB analysis and probable cause from the NTSB dataset
Sources
NTSB record ANC24LA045
- Event ID
- 20240610194426
- Case number
- ANC24LA045
- Dataset
- full-current
- Source SHA-256
- 5cf380f0061817c0331a6b2d8cc7e0ee3a79bea469a1001dc5c10e56f35f5ab3
Source notes (4)
- Unreviewed is an editorial label, not an investigation status. API-sourced is not report-checked or human-reviewed. Explicit event totals are used without summing aircraft injury tables; onboard allocation is withheld. Unknown values remain unknown. The operation category is mapped from the NTSB-reported FAR part and has not been reviewed.
- Filled from the NTSB case API where the bulk record had no value: investigation status, coordinates, cause areas. Values present in the bulk record are kept.
- The date is the local date, which is the same as the UTC date the NTSB stores.
- API snapshot SHA-256: b132c61f554dd27f79c4a81ea8d3842890154c1ddb88f94e84e35b98366aa544; retrieved 2026-09-16T18:52:03.617Z.