# NTSB CHI88LA099: Cessna 150M, N9410U, Zeigler, IL, April 21, 1988

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: April 21, 1988, 08:45 local (13:45 UTC)
- Place: Zeigler, IL
- Coordinates: 37.889503, -89.050598 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=37.8895&lon=-89.0506&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report September 25, 1989
- Report: Approved by Office Director
- NTSB case key (mKey): 14065
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI88LA099
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/14065/pdf
- Page: https://openairdocs.org/ntsb/CHI88LA099

## 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, descent - normal
  - emergency procedure - simulated, pilot in command(cfi)
  - engine assembly,valve,exhaust - binding(mechanical) (cause)
- Forced landing, descent - emergency
- Nose over, landing - roll
  - terrain condition - soft (contributing factor)

## Analysis

UPON COMPLETION OF A PRACTICE EMERGENCY LANDING PROCEDURE DURING AN INSTRUCTIONAL FLIGHT, THE ENGINE STARTED TO RUN ROUGH AND THEN QUIT. THE INSTRUCTOR WAS ABLE TO REGAIN PARTIAL POWER, AND MADE FORCED LANDING IN FRESHLY PLOWED FIELD. THE AIRCRAFT NOSED OVER JUST BEFORE IT CAME TO A COMPLETE STOP. THE ENGINE WAS TEST RUN ON THE AIRFRAME, AND RAN VERY ROUGH. DIFFERENTIAL COMPRESSION CHECK WAS PERFORMED WITH LOW COMPRESSION ON CYLINDERS #2 AND #4. FURTHER INVESTIGATION REVEALED THAT THE #2 AND #4 EXHAUST VALVES WERE BINDING WHEN THE VALVES WERE APPROXIMATELY 0.25 INCHES FROM THE SEAT. THE VALVE STEMS WERE EXAMINED AND FOUND TO HAVE A CARBON-LIKE DEPOSIT SURROUNDING THE STEM FROM THE VALVE FACE TO THE AREA ON THE STEM WHERE IT ENTERS THE VALVE GUIDE.

## Aircraft

- Registration: [N9410U](https://openairdocs.org/deregistered/N9410U-2013-02-20), registration cancelled 2013-02-20, S/N 15078358, built 1976 (OpenAirDocs)
- Reported make and model: CESSNA 150M
- Registry model: [Cessna 150M](https://openairdocs.org/model/cessna-150m) (registry code 2071830) (OpenAirDocs)
- Registry engine: [Continental 0-200 series](https://openairdocs.org/engine/continental-0-200-series) (registry code 17020, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 15078358
- Airframe hours: 4866
- Engines: CONTINENTAL O-200 100 horsepower reciprocating
- Damage: Substantial damage
- Flight: Instructional, Part 91
- Operator: Southern Illinois University, doing business as Air Institute And Services
- Registered owner: Air Institute And Service
- Airworthiness certificate: Standard, Utility
- Last inspection: Annual, April 4, 1988, 29 hours before
- Departed: MDH, CARBONDALE, IL
- Airport: NONE

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 21; commercial, flight instructor; airplane ratings: single-engine land; instrument ratings: airplane; medical: class 1, valid medical--no waivers/lim.; seat: right; flight hours: 304 total, 100 in this make and model, 192 as pilot in command, 17 in the last 90 days, 1 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 140° at 6 knots
- Visibility: 7 statute miles
- Lowest ceiling: 25,000 ft broken
- Temperature: 64 °F, dew point 45 °F
- Altimeter: 29.00 inHg
- Observed at: MDH, 20 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 19880421012409A](https://openairdocs.org/incident/19880421012409A), Apr 21, 1988: Cessna 150M, Zeigler, IL, Substantial damage. Engine lost partial power. Nosed over landing in a plowed field. Found stuck exhaust valves.

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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