# NTSB ANC94LA019: Cessna 206, N7586Z, Anchorage, AK, November 20, 1993

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: November 20, 1993, 11:15 local (15:15 UTC)
- Place: Anchorage, AK
- Coordinates: 61.220199, -149.849884 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=61.2202&lon=-149.8499&mi=10
- Phase of flight: [Initial climb](https://openairdocs.org/ntsb-phases/350) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 4 uninjured
- Status: Completed, report June 30, 1994
- Report: Approved by Office Director
- NTSB office: Alaska Regional Office
- NTSB case key (mKey): 2474
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC94LA019
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/2474/pdf
- Page: https://openairdocs.org/ntsb/ANC94LA019

## Probable cause

THE FROZEN THROTTLE CABLE DUE TO MOISTURE.

## Sequence of events

In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf).

- Loss of engine power(partial) - nonmechanical, takeoff - initial climb
  - throttle/power lever,cable - frozen (cause)
- Forced landing, descent - emergency
- On ground/water collision with object, landing - roll
  - object - vehicle

## Analysis

AFTER TAKE OFF THE PILOT ATTEMPTED TO REDUCE THE POWER BY RETARDING THE THROTTLE.  THE THROTTLE WAS STIFF AND HE APPLIED MORE PRESSURE AND THEN IT JERKED OUT AND HE WAS ONLY ABLE TO MAINTAIN 1000 RPM ON HIS ENGINE.  MANIPULATION OF THE THROTTLE DID NOT CHANGE THE RPM.  HE WAS FORCED TO LAND ON A TAXIWAY AND THE AIRPLANE STRUCK TWO PARKED VEHICLES DURING THE ROLL OUT.  EXAMINATION OF THE AIRPLANE SHOWED THAT THE THROTTLE CABLE HAD FROZEN DUE TO MOISTURE.  THE PILOT STATED HE PREHEATED THE ENGINE COMPARTMENT TO A WARM TEMPERATURE.

## Factual narrative

On November 20, 1993, at 1115 Alaska standard time, a wheel equipped Cessna 206 airplane, N7586Z, registered to and operated by Airlift Alaska, experienced a non-mechanical power loss during takeoff and was forced to land.  The business flight, operating under 14 CFR Part 91, was departing Merrill Field on a visual flight rules flight plan and visual meteorological conditions prevailed.  The destination was the Denali Strip #2 near Cantwell, Alaska.  The airplane was substantially damaged and two vehicles were also damaged.  The Airline Transport Certificated Pilot-in-Command and his passenger were not injured.

According to the Pilot in Command, they had reached an altitude of 500 feet above ground level and he tried to reduce power.  The throttle would not move so he pulled harder.  The throttle then jerked out and the engine power reduced to less than 1000 RPM.  The Pilot-in-Command attempted to push the throttle back in but it would not move.  They subsequently completed a forced landing on taxiway "delta" on Merrill Field.

## Aircraft

- Registration: N7586Z (not matched to a registry record)
- Reported make and model: CESSNA 206
- Category: Airplane
- Serial number: 20606371
- Airframe hours: 4423
- Engines: CONTINENTAL IO-520-F 300 horsepower reciprocating
- Damage: Substantial damage
- Flight: Business, Part 91
- Operator: Airlift Alaska
- Registered owner: Michael J. Yorke
- Airworthiness certificate: Standard, Normal
- Last inspection: Annual, September 28, 1993, 13 hours before
- Destination: CANTWELL, AK
- Flight plan: VFR
- Airport: MRI, Merrill Field, runway 15, 3,000 × 75 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 40; flight instructor, airline transport; airplane ratings: single-engine land, single-engine sea, multi-engine land; instrument ratings: airplane; medical: class 2, valid medical--w/ waivers/lim; seat: left; flight hours: 12,500 total, 3,500 in this make and model, 12,300 as pilot in command, 270 in the last 90 days, 90 in the last 30 days, 6 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: calm
- Visibility: 90 statute miles
- Lowest ceiling: none
- Temperature: -9 °F

## FAA reports on this event (1)

The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs).

- [Accident 19931120044019A](https://openairdocs.org/incident/19931120044019A), Nov 20, 1993: Cessna 206CESSNA, Anchorage, AK, Substantial damage. Throttle jammed at 1000 RPM on takeoff climb. Stalled onto taxiway. Hit vehicles. Cable frozen due below zero temp.

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

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