# NTSB SEA83FA057: Cessna TU206G, N4606U, Soda Springs, ID, November 21, 1982

- Type: NTSB accident investigation
- Classification: Accident · Fatal · Field investigation · Final report
- Date: November 20, 1982, 19:00 local (Nov 21, 1982, 02:00 UTC)
- Place: Soda Springs, ID
- Coordinates: 42.750961, -111.529869 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=42.7510&lon=-111.5299&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: Fatal
- Injuries: 1 fatal
- Status: Completed, report November 20, 1983
- Report: Approved by Office Director
- NTSB case key (mKey): 72638
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA83FA057
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/72638/pdf
- Page: https://openairdocs.org/ntsb/SEA83FA057

## Sequence of events

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

- In flight encounter with weather, cruise - normal
  - preflight planning/preparation - inadequate, pilot in command (contributing factor)
  - preflight briefing service - not obtained, pilot in command (contributing factor)
  - weather condition - low ceiling (contributing factor)
  - weather condition - snow (contributing factor)
  - weather condition - obscuration (contributing factor)
  - light condition - dark night (contributing factor)
  - vfr flight into imc - continued, pilot in command (cause)
- Loss of control - in flight, maneuvering
  - aircraft handling - not maintained, pilot in command (cause)
  - spatial disorientation, pilot in command (cause)
  - lack of total instrument time, pilot in command (contributing factor)
- In flight collision with terrain/water, descent - uncontrolled

## Analysis

A SEARCH FOR THE AIRCRAFT WAS BEGUN AFTER THE PILOT'S RELATIVES REPORTED IT WAS OVERDUE AND RESIDENTS NEAR THE CRASH SITE HEARD THE SOUNDS OF A LOW FLYING PLANE SUDDENLY TERMINATE. UNOFFICIAL REPORTS OF THE WEATHER INDICATED IT WAS ABOUT 200 FT OBSCURED, 1/4 MI VISIBILITY WITH HEAVY SNOW, TEMP 30 DEG, WIND 200 DEG AT 5 KTS. THE AIRCRAFT WAS FOUND IN FEBRUARY 1983 BY A CROSS-COUNTRY SKIER. AN INVESTIGATION REVEALED IT HAD CRASHED AT HIGH SPEED IN A NEAR VERTICAL DIVE. THE NON-INSTRUMENT RATED PILOT HAD NOT FILED A FLIGHT PLAN AND NO RECORD OF A WEATHER BRIEFING WAS FOUND. THERE WERE NO COMMUNICATIONS WITH THE PILOT AFTER HE DEPARTED THE SALT LAKE CITY AREA. HE HAD BEEN ASSIGNED A DISCRETE TRANSPONDER CODE DURING DEPARTURE AND HAD NOT CHANGED THE CODE, THUS A RADAR TRACK WAS OBTAINED. THE RADAR SHOWED A CONTINUOUS TRACK TO THE AREA OF THE ACCIDENT, THEN WAS INTERMITTENTLY LOST AND REMAINED IN "BOBS AND WEAVES" UNTIL IT DISAPPEARED. NO PREIMPACT/MECHANICAL MALFUNCTION OR FAILURES WERE FOUND.

## Aircraft

- Registration: [N4606U](https://openairdocs.org/deregistered/N4606U-2012-12-07), registration cancelled 2012-12-07, S/N U20604998, built 1979 (OpenAirDocs)
- Reported make and model: CESSNA TU206G
- Registry model: [Cessna TU206G](https://openairdocs.org/model/cessna-tu206g) (registry code 2073357) (OpenAirDocs)
- Registry engine: [Continental TSIO-520 series](https://openairdocs.org/engine/continental-tsio-520-series) (registry code 17040, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: U20604998
- Engines: CONTINENTAL TSIO-520-M 310 horsepower reciprocating
- Damage: Destroyed
- Flight: Part 91
- Operator: Victor O. Hegsted, Jr.
- Registered owner: H. Reed Alderson
- Departed: SLC, SALT LAKE CITY, UT
- Destination: IDA, IDAHO FALLS, ID

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 51; private; airplane ratings: single-engine land; medical: class 3, valid medical--w/ waivers/lim; flight hours: 624 total, 343 in this make and model, 571 as pilot in command, 7 in the last 90 days, 4 in the last 30 days, 2 in the last 24 hours

## Weather

- Conditions: Instrument (IMC), Night/dark
- Wind: 200° at 5 knots
- Lowest ceiling: 200 ft
- Temperature: 86 °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 19821120069759A](https://openairdocs.org/incident/19821120069759A), Nov 20, 1982: Cessna TU206G, Soda Springs, ID, Destroyed, 1 fatal. Pilot attempted flight into adverse weather conditions. Aircraft crashed during snow storm.

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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