# NTSB ANC87LA018: Cessna U206G, N4736U, Uganik Pass, AK, December 4, 1986

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: December 4, 1986, 16:10 local (20:10 UTC)
- Place: Uganik Pass, AK
- Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 4 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB office: Alaska Regional Office
- NTSB case key (mKey): 4811
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC87LA018
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/4811/pdf
- Page: https://openairdocs.org/ntsb/ANC87LA018

## Sequence of events

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

- In flight collision with terrain/water, maneuvering
  - terrain condition - mountainous/hilly (contributing factor)
  - in-flight planning/decision - inadequate, pilot in command (cause)
  - improper use of procedure, pilot in command (contributing factor)
  - terrain condition - rough/uneven (contributing factor)
  - weather evaluation - not performed, pilot in command (cause)
  - weather condition - clouds (cause)
  - procedures/directives - not followed, pilot in command (cause)
  - weather condition - whiteout (cause)
  - meteorological service - not obtained, pilot in command (cause)

## Analysis

THE PILOT STATED THAT HE ENCOUNTERED A COMPLETE WHITE-OUT CONDITION; HE STARTED A TURN TO THE LEFT AND STRUCK THE TOP OF THE RIDGE AT THE 1780 FOOT LEVEL.

## Aircraft

- Registration: [N4736U](https://openairdocs.org/deregistered/N4736U-2016-03-03), registration cancelled 2016-03-03, S/N U20605072, built 1979 (OpenAirDocs)
- Reported make and model: CESSNA U206G
- 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: U20605072
- Airframe hours: 3525
- Engines: CONTINENTAL IO-520F 300 horsepower reciprocating
- Damage: Substantial damage
- Flight: Part 135
- Operator: Island Air Service
- Registered owner: William Ellis Hall
- Airworthiness certificate: Standard, Utility
- Last inspection: 100 hour, March 4, 1986, 40 hours before
- Departed: ADQ, KODIAK, AK
- Destination: ZACHARY BAY, AK
- Flight plan: VFR
- Airport: 1

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 43; commercial; airplane ratings: single-engine land; instrument ratings: airplane; medical: class 2, valid medical--w/ waivers/lim; seat: left; flight hours: 6,050 total, 3,946 in this make and model, 3,905 as pilot in command, 175 in the last 90 days, 90 in the last 30 days, 2 in the last 24 hours

## Weather

- Conditions: Instrument (IMC), Night/dark
- Wind: calm
- Lowest ceiling: 2,500 ft overcast
- Temperature: 28 °F, dew point 27 °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 19861204067979A](https://openairdocs.org/incident/19861204067979A), Dec 4, 1986: Cessna U206G, Uganik Pass, AK, Substantial damage. Encountered whiteout conditions on a VFR flight and impacted a hill. No record of preflight weather briefing.

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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