# NTSB ANC85FA016: Cessna 180, N9433C, Chugiak, AK, November 12, 1984

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Field investigation · Final report
- Date: November 12, 1984, 12:30 local (16:30 UTC)
- Place: Chugiak, AK
- Coordinates: 61.409255, -149.170364 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=61.4093&lon=-149.1704&mi=10
- Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (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): 4388
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC85FA016
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/4388/pdf
- Page: https://openairdocs.org/ntsb/ANC85FA016

## Sequence of events

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

- Loss of engine power(total) - nonmechanical, approach - vfr pattern - final approach
  - descent - performed, pilot in command
  - weather condition - unfavorable wind (contributing factor)
  - carburetor heat - improper use of, pilot in command (cause)
  - throttle/power control - improper use of, pilot in command (cause)
  - mixture - improper use of, pilot in command (cause)
- In flight collision with object, approach - vfr pattern - final approach
  - object - tree(s)

## Analysis

ACFT COLLIDED WITH TREES APRX 2,600 FT SHORT OF RWY 19 THRESHOLD DURING THE LANDING APCH. THE ACFT STOPPED 35-40 FT AGL IN TREES AND AFTER A FEW MINUTES FELL TO THE GROUND. A DESCENT WAS MADE FROM APRX 10,000 FT WITH A LEANED MIXTURE, CLOSED THROTTLE AND NO CARBURETOR HEAT USAGE. THE OATS RANGES FROM 0 DEG F AT GROUND LEVEL TO -27 TO -36 DEG F AT 10,000 FT. PLT STATED THAT WHEN HE ADVANCED THE THROTTLE DURING THE APCH A RESPONSE IN POWER WAS NOT RECEIVED.

## Aircraft

- Registration: [N9433C](https://openairdocs.org/deregistered/N9433C-2025-10-18), registration cancelled 2025-10-18, S/N 31831, built 1955 (OpenAirDocs)
- Reported make and model: CESSNA 180
- Registry model: [Cessna 180](https://openairdocs.org/model/cessna-180) (registry code 2072602) (OpenAirDocs)
- Registry engine: [Continental O-470 series](https://openairdocs.org/engine/continental-o-470-series) (registry code 17026, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 31831
- Airframe hours: 1990
- Engines: CONTINENTAL O-470-K 230 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Registered owner: Glenn Arnon Borders
- Airworthiness certificate: Standard, Normal
- Last inspection: Annual, June 9, 1984, 20 hours before
- Departed: MONTAGUE ISLAND, AK
- Destination: Z15, CHUGIAK, AK
- Airport: Z-15, Birchwood, runway 19, 4,000 × 100 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 63; commercial; airplane ratings: single-engine land, multi-engine land, single-engine sea; medical: class 2, valid medical--w/ waivers/lim; seat: left; flight hours: 3,200 total, 300 in this make and model, 3,120 as pilot in command, 40 in the last 90 days, 2 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: calm
- Visibility: 50 statute miles
- Lowest ceiling: none
- Temperature: -0 °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 19841112061579A](https://openairdocs.org/incident/19841112061579A), Nov 12, 1984: Cessna 180, Chugiak, AK, Substantial damage. Descended from altitude without carburetor heat, enrichning mixture and engine at idle. Engine quit struck trees.

## Other investigations on N9433C (1)

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.

- [NTSB ANC77DAH27](https://openairdocs.org/ntsb/ANC77DAH27), Sep 18, 1977: Cessna 180 (N9433C), Talkeetna, AK, substantial damage

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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