# NTSB SEA85LA119: Cessna 150M, N704UV, Santa Rosa, CA, May 18, 1985

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: May 18, 1985, 12:45 local (19:45 UTC)
- Place: Santa Rosa, CA
- Coordinates: 38.529548, -122.689254 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=38.5295&lon=-122.6893&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 40163
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA85LA119
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/40163/pdf
- Page: https://openairdocs.org/ntsb/SEA85LA119

## Sequence of events

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

- Loss of engine power(partial) - mech failure/malf, cruise - normal
  - weather condition - carburetor icing conditions (cause)
  - carburetor heat control - inoperative (cause)
- Forced landing, cruise - normal
  - terrain condition - high vegetation (contributing factor)
- On ground/water encounter with terrain/water, landing - flare/touchdown

## Analysis

WHILE ON A SHORT LOCAL FLIGHT TO A COSTAL AREA AND RETURN. THE ENGINE LOST SOME POWER. CARBURETOR HEAT WAS APPLIED BUT NO INCREASE IN POWER WAS NOTED. THE PLT THEN SET UP A GLIDE WITH INTENTIONS OF MAKING A LANDING ONTO THE BEACH AREA. AT ABOUT 500 FEET M.S.L. POWER WAS RESUMED AND THE PLT ELECTED TO CLIMB TO 2,000 FEET M.S.L. WITH THE INTENTIONS OF RETURNING TO THE DEPARTURE AIRPORT. OVER RUGGED TREED TERRAIN A POWER LOSS WAS AGAIN NOTED. APPLICATION OF CARBURETOR HEAT HAD NO EFFECT UPON THE ENGINE. A FORCED LANDING WAS MADE INTO TALL HAY. INSPECTION OF THE ENGINE REVEALED THAT THE ENGINE COMPARTMENT CARBURETOR AIR HEAT CONTROL LEVER WAS BROKEN WITH THE CONTROL CABLE DISCONNECTED AND THE HOT AIR DOOR JAMMED IN THE COLD POSITION.

## Aircraft

- Registration: [N704UV](https://openairdocs.org/deregistered/N704UV-2012-05-30), registration cancelled 2012-05-30, S/N 15078893 (OpenAirDocs)
- Reported make and model: CESSNA 150M
- Registry model: [Cessna 150M](https://openairdocs.org/model/cessna-150m) (registry code 2071830) (OpenAirDocs)
- Category: Airplane
- Serial number: 15078893
- Airframe hours: 3116
- Engines: CONTINENTAL O-200 100 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Registered owner: Ken Pottal
- Airworthiness certificate: Standard, Utility; Standard, Normal
- Last inspection: Annual, November 3, 1984, 93 hours before
- Departed: STS, SANTA ROSA, CA
- Destination: STS, SANTA ROSA, CA
- Airport: Unknown

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; commercial; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane; medical: unknown, valid medical--no waivers/lim.; seat: left; flight hours: 2,394 total, 137 in this make and model, 2,282 as pilot in command, 21 in the last 90 days

## Weather

- Conditions: Visual (VMC), Day
- Wind: 160° at 5 knots
- Visibility: 50 statute miles
- Lowest ceiling: none
- Temperature: 30 °F
- Altimeter: 30.00 inHg

## Other investigations on N704UV (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 LAX98LA262](https://openairdocs.org/ntsb/LAX98LA262), Aug 10, 1998: Cessna 150M (N704UV), Santa Paula, CA, substantial damage. Probable cause: Failure of the number one cylinder due to a fatigue crack that had originated from corrosion pits at the cooling fin.

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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