# NTSB ANC87LA022: Cessna 206, N734WE, Ruby, AK, December 22, 1986

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: December 22, 1986, 12:15 local (16:15 UTC)
- Place: Ruby, AK
- Coordinates: 65.030113, -154.910736 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=65.0301&lon=-154.9107&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB office: Alaska Regional Office
- NTSB case key (mKey): 4814
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC87LA022
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/4814/pdf
- Page: https://openairdocs.org/ntsb/ANC87LA022

## Sequence of events

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

- Loss of control - on ground/water, landing - roll
  - terrain condition - icy (contributing factor)
  - unsuitable terrain or takeoff/landing/taxi area - not identified, pilot in command (cause)
  - directional control - not maintained, pilot in command (cause)
  - ground loop/swerve - inadvertent, pilot in command (cause)

## Analysis

THE PILOT STATED THAT DURING THE LANDING ROLL ON THE FROZEN RIVER, HE LOST CONTROL OF THE AIRCRAFT CAUSING THE AIRCRAFT TO GROUND LOOP.

## Aircraft

- Registration: [N734WE](https://openairdocs.org/aircraft/N734WE), registered now, S/N U20604883, built 1979 (OpenAirDocs)
- Reported make and model: CESSNA 206
- Registry model: [Cessna U206G](https://openairdocs.org/model/cessna-u206g) (registry code 2073356) (OpenAirDocs)
- Registry engine: [Continental IO-520 series](https://openairdocs.org/engine/continental-io-520-series) (registry code 17032, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: U20604883
- Airframe hours: 1950
- Engines: CONTINENTAL IO-520 285 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Registered owner: Joseph Mattie
- Airworthiness certificate: Standard, Utility
- Last inspection: Annual, June 13, 1986, 200 hours before

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 37; airline transport; airplane ratings: single-engine land, multi-engine land, single-engine sea; instrument ratings: airplane; medical: class 2, valid medical--no waivers/lim.; seat: left; flight hours: 8,500 total, 2,600 in this make and model, 8,200 as pilot in command, 75 in the last 90 days, 23 in the last 30 days, 4 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 300° at 5 knots
- Visibility: 100 statute miles
- Lowest ceiling: none
- Temperature: -9 °F, dew point 19 °F
- Altimeter: 29.00 inHg

## 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 19861222068599A](https://openairdocs.org/incident/19861222068599A), Dec 22, 1986: Cessna U206G, Ruby, AK, Substantial damage. The aircraft ground looped during a ski landing on a frozen river. Pilot failed to properly survey landing area.

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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