# NTSB ANC92LA167: Cessna 150, N7763F, Bethel, AK, September 10, 1992

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: September 9, 1992, 16:30 local (Sep 10, 1992, 00:30 UTC)
- Place: Bethel, AK
- Coordinates: 60.81031, -161.85057 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=60.8103&lon=-161.8506&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report May 26, 1993
- Report: Approved by Office Director
- NTSB office: Alaska Regional Office
- NTSB case key (mKey): 5806
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC92LA167
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/5806/pdf
- Page: https://openairdocs.org/ntsb/ANC92LA167

## Probable cause

THE CARBURETOR ICING CONDITIONS AND THE DELAY BY THE PILOT IN COMMAND/CFI IN USING CARBURETOR HEAT.

## Sequence of events

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

- Loss of engine power(total) - nonmechanical, cruise - normal
  - weather condition - carburetor icing conditions (cause)
  - carburetor heat - delayed, pilot in command(cfi) (cause)
- Forced landing, descent - emergency
- On ground/water encounter with terrain/water, landing - roll
  - terrain condition - tundra

## Analysis

THE PILOT IN COMMAND/FLIGHT INSTRUCTOR REPORTED THAT THE ENGINE BEGAN TO RUN ROUGH ABOUT TWO HOURS INTO THE FLIGHT. FULL CARBURETOR HEAT WAS APPLIED AND THE ROUGHNESS DISAPPEARED.  ABOUT 30 MINUTES LATER, THE ENGINE ROUGHNESS REAPPEARED.  ENGINE INSTRUMENT INDICATIONS WERE NORMAL.  THE ENGINE COUGHED AND SPUTTERED, BUT LITTLE FLUCTUATION IN RPM WAS NOTED. FULL CARBURETOR HEAT WAS ONCE AGAIN APPLIED BUT THE ENGINE QUIT AND ATTEMPTS AT RESTARTING WERE NOT SUCCESSFUL.  THE ENGINE STARTED AND RAN NORMALLY (RESTRICTED TO LOW RPM DUE TO MOTOR MOUNT DAMAGE) DURING A POST ACCIDENT STATIC EXAMINATION AND OPERATIONAL CHECK.  ALL ENGINE CONTROLS WERE INTACT.  NO FOREIGN MATERIAL/CONTAMINANTS WAS FOUND IN THE WING TANKS, ENGINE FUEL STRAINER, AND CARBURETOR FINGER SCREEN.  THE TEMPERATURE/DEW POINT AT THE TIME OF THE ACCIDENT WAS 44 DEG AND 30 DEG RESPECTIVELY. ACCORDING TO THE CARB ICING PROB CHART SERIOUS ICING AT CRUISE POWER WAS POSSIBLE AT THE AMBIENT CONDITIONS.

## Aircraft

- Registration: [N7763F](https://openairdocs.org/aircraft/N7763F), registered now, S/N 15063863, built 1966 (OpenAirDocs)
- Reported make and model: CESSNA 150
- Registry model: [Cessna 150F](https://openairdocs.org/model/cessna-150f) (registry code 2071814) (OpenAirDocs)
- Registry engine: [Continental 0-200 series](https://openairdocs.org/engine/continental-0-200-series) (registry code 17020, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 150 63863
- Airframe hours: 4662
- Engines: CONTINENTAL O-200-A 100 horsepower reciprocating
- Damage: Substantial damage
- Flight: Instructional, Part 91
- Operator: Hugh T. Youngers
- Registered owner: William T. O Brien
- Airworthiness certificate: Standard, Normal
- Last inspection: Annual, July 9, 1992, 42 hours before
- Departed: PORT ALSWORTH, AK
- Flight plan: VFR

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 27; commercial, flight instructor; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 1, valid medical--no waivers/lim.; seat: right; flight hours: 1,430 total, 300 in this make and model, 1,398 as pilot in command, 120 in the last 90 days, 25 in the last 30 days, 4 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 330° at 12 knots
- Visibility: 30 statute miles
- Lowest ceiling: 8,500 ft broken
- Temperature: 45 °F, dew point 30 °F
- Altimeter: 30.00 inHg
- Observed at: BET, 40 nm away

## 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 19920909040609A](https://openairdocs.org/incident/19920909040609A), Sep 9, 1992: Cessna 150E, Bethel, AK, Substantial damage. Lost power en route. Crash landed . No engine defect. Serious carburetor icing conditions in 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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