# NTSB CHI86LA084: Cessna 207, N18SA, Milwaukee, WI, February 10, 1986

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: February 10, 1986, 09:20 local (15:20 UTC)
- Place: Milwaukee, WI
- Coordinates: 42.979297, -87.899826 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=42.9793&lon=-87.8998&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 13421
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI86LA084
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/13421/pdf
- Page: https://openairdocs.org/ntsb/CHI86LA084

## Sequence of events

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

- Loss of engine power(total) - mech failure/malf, climb - to cruise
  - maintenance,replacement - improper, other maintenance personnel (contributing factor)
  - maintenance,service of aircraft/equipment - improper, other maintenance personnel (cause)
  - aircraft preflight - inadequate, pilot in command (cause)
- Forced landing, descent - emergency
- On ground/water collision with object, landing - roll
  - object - utility pole

## Analysis

AFTER PREHEATING THE ENG THE PLT TOOK OFF AND DURING CLIMB THE CABIN FILLED WITH SMOKE AND THE ENG STOPPED. A FORCED LANDING WAS MADE ON A CITY STREET DURING WHICH THE LEFT WING CONTACTED A SIGN POLE. POST ACCIDENT TEARDOWN OF THE ENG DISCLOSED THAT AN OIL TEMP CONTROL VALVE REQUIRED TO RETAIN THE ENG OIL IN THE CRANKCASE UNTIL PROPER OPERATING TEMP IS ATTAINED WAS NOT INSTALLED. WITHOUT THIS TEMP VALVE, OIL IS PERMITTED TO FLOW THROUGH THE OIL COOLER. THE PLT ALSO FAILED TO VISUALLY CHECK THE VISCOSITY OF THE OIL AFTER PREHEATING THE ENG.

## Aircraft

- Registration: [N18SA](https://openairdocs.org/deregistered/N18SA-1988-06-07), registration cancelled 1988-06-07, S/N 20700272, built 1974 (OpenAirDocs)
- Reported make and model: CESSNA 207
- Registry model: [Cessna 207](https://openairdocs.org/model/cessna-207) (registry code 2073602) (OpenAirDocs)
- Registry engine: [Continental IO-520 series](https://openairdocs.org/engine/continental-io-520-series) (registry code 17032, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 20700272
- Airframe hours: 5350
- Engines: CONTINENTAL IO-520-F 300 horsepower reciprocating
- Damage: Substantial damage
- Flight: Part 135
- Operator: Burley Harding
- Airworthiness certificate: Standard, Normal
- Last inspection: Annual, August 27, 1985
- Departed: MKE, MILWAUKEE, WI
- Destination: CWA, MOSINEE, WI

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 32; commercial; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane; medical: class 2, valid medical--no waivers/lim.; seat: left; flight hours: 3,000 total, 2,360 in this make and model, 2,740 as pilot in command, 180 in the last 90 days, 3 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 290° at 9 knots
- Visibility: 10 statute miles
- Lowest ceiling: none
- Temperature: 7 °F, dew point 3 °F
- Altimeter: 30.00 inHg
- Observed at: MKE, 3 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 19860210002479A](https://openairdocs.org/incident/19860210002479A), Feb 10, 1986: Cessna 207, Milwaukee, WI, Substantial damage. Smoke in cockpit and engine quit on takeoff. Struck objects during landing on street. Wrong oil temp control valve.

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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