# NTSB SEA92LA052: Cessna 150L, N11568, Mulino, OR, February 27, 1992

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: February 27, 1992, 09:00 local (17:00 UTC)
- Place: Mulino, OR
- Coordinates: 45.200637, -122.540954 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=45.2006&lon=-122.5410&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report August 13, 1993
- Report: Approved by Office Director
- NTSB case key (mKey): 41634
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA92LA052
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/41634/pdf
- Page: https://openairdocs.org/ntsb/SEA92LA052

## Probable cause

CARBURETOR ICE AND IMPROPER USE OF THE CARBURETOR HEAT. FACTORS TO THE ACCIDENT WERE: CARBURETOR ICING CONDITIONS AND AN INADEQUATE WEATHER EVALUATION.

## Sequence of events

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

- Loss of engine power(partial) - nonmechanical, cruise - normal
  - fuel system,carburetor - ice (cause)
  - weather condition - carburetor icing conditions (contributing factor)
  - weather evaluation - inadequate, pilot in command (contributing factor)
  - carburetor heat - improper use of, pilot in command (cause)
- Forced landing, descent - emergency
- Nose over, landing - roll
  - terrain condition - soft

## Analysis

DURING A PLEASURE FLIGHT, THE AIRPLANE WAS IN CRUISE FLIGHT WHEN THE ENGINE RPM DROPPED.  THE PLT APPLIED CARBURETOR HEAT AND THE RPM INCREASED.  THE PLT TURNED OFF THE CARBURETOR HEAT AND THE RPM DROPPED. THE PLT CONTINUED TO TURN ON AND OFF THE CARBURETOR HEAT UNTIL THE ENGINE WAS UNABLE TO PRODUCE SUFFICIENT POWER TO MAINTAIN ALTITUDE.  THE PILOT INITIATED AN EMERGENCY LANDING IN AN OPEN FIELD WHERE DURING THE LANDING ROLL, THE AIRPLANE NOSED OVER.  POST CRASH EXAMINATION OF THE ENGINE DID NOT REVEAL ANY MECHANICAL FAILURES OR MALFUNCTIONS.  EXISTING METEOROLOGICAL CONDITIONS AT THE TIME OF THE ACCIDENT WERE WITHIN RANGE OF PROBABLE CARBURETOR ICING CONDITIONS.

## Aircraft

- Registration: [N11568](https://openairdocs.org/deregistered/N11568-2014-01-08), registration cancelled 2014-01-08, S/N 15075528, built 1973 (OpenAirDocs)
- Reported make and model: CESSNA 150L
- Registry model: [Cessna 150L](https://openairdocs.org/model/cessna-150l) (registry code 2071826) (OpenAirDocs)
- Registry engine: [Continental 0-200 series](https://openairdocs.org/engine/continental-0-200-series) (registry code 17020, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 15075528
- Airframe hours: 3500
- Engines: CONTINENTAL O-200 100 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Operator: Kay Smith
- Registered owner: Kay Smith
- Airworthiness certificate: Standard, Normal
- Last inspection: Annual, February 1, 1992, 54 hours before
- Departed: O56, VANCOUVER, WA
- Destination: S21, SUNRIVER, OR

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 25; private; airplane ratings: single-engine land; medical: class 3, valid medical--no waivers/lim.; seat: right; flight hours: 285 total, 134 in this make and model, 198 as pilot in command, 42 in the last 90 days, 9 in the last 30 days, 1 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Visibility: 40 statute miles
- Temperature: 61 °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 19920227007499A](https://openairdocs.org/incident/19920227007499A), Feb 27, 1992: Cessna 150L, Mulino, OR, Substantial damage. Engine lost RPM but regained two thirds power applying carb heat. Failed to leave heat on,engine quit. Forced landing

## Other investigations on N11568 (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 SEA06CA056](https://openairdocs.org/ntsb/SEA06CA056), Feb 23, 2006: Cessna 150L (N11568), Hillsboro, OR, substantial damage. Probable cause: The student pilot's delayed use of carburetor heat in carburetor icing conditions while maneuvering. Soft terrain was a factor.

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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