Mountain Air of Alaska Cessna 206 accident
Cessna 206 · Accident: partial loss of engine power (non-mechanical) en route
Event
- NTSB case
- ANC94LA088
- 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
- Charter & commuter
- 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
- N4685F
- Operator
- Mountain Air of Alaska
- Onboard fatalities
- Unknown
- Route
- From not recordedTo not recorded
- Aircraft age
- Not recorded
- 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 135: Air Taxi & Commuter
- 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
- En route · cruise
- First occurrenceThe 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
- Partial loss of engine power (non-mechanical)
- 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
- Company maintenance personnel › Maintenance, 100-hour inspection, improper
- Throttle/power lever, push/pull rod › Worn
Approximate · Coordinates as recorded by the NTSB; no uncertainty radius is established.
NTSB narrative
THE THROTTLE CONTROL LEVER ARM USED TO ATTACH THE BALL BEARING TYPE THROTTLE ROD END TO THE CARBURETOR WORE COMPLETELY THROUGH. THE SIDE WALLS OF THE LEVER THAT WERE ADJACENT TO THE BOLT HOLE WERE SCORED AND REPLICATED THE DIMENSIONS OF THE WASHERS THAT WERE USED ON THE BOLT AND NUT SIDE OF THE LEVER. THE BOLT AND WASHERS THAT WERE USED TO CONNECT THE CABLE END TO THE LEVER WERE NOT APPROVED FOR THE APPLICATION. THE PLANE WAS INSPECTED 35 HOURS PRIOR TO THE ACCIDENT.
Probable cause
THE FAILURE OF THE THROTTLE CONTROL LEVER ARM AS A RESULT OF THE IMPROPER 100 HOUR INSPECTION BY COMPANY MAINTENANCE PERSONNEL.
Verbatim NTSB analysis and probable cause from the NTSB dataset
Sources
NTSB record ANC94LA088
- Event ID
- 20001206X01646
- Case number
- ANC94LA088
- Dataset
- historical-pre2008
- Source SHA-256
- 89e2df6d848e7ab3b42e7d7c7a03ff403303057a26ca04c95b3ea67201c3ce74
Source notes (5)
- 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. 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: 2bd91d34d991afe86ad1194ac245fe9e09d06c63a2f879bc463bc23f7aee8732; retrieved 2026-09-18T18:12:00.615Z.
- The NTSB's operator name is blank for N4685F; the operator shown is the name the NTSB records it doing business as.