ASN Wikibase Occurrence # 371236
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| Date: | Thursday 21 April 1988 |
| Time: | 09:45 LT |
| Type: |  Cessna 150M |
| Owner/operator: | Southern Illinois University |
| Registration: | N9410U |
| MSN: | 15078358 |
| Year of manufacture: | 1976 |
| Total airframe hrs: | 4866 hours |
| Engine model: | CONTINENTAL O-200 |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Zeigler, IL -
 United States of America
|
| Phase: | Landing |
| Nature: | Training |
| Departure airport: | Carbondale, IL (KMDH) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
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.
Probable Cause:
Accident investigation:
 |
|
Sources:
NTSB CHI88LA099
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 25-Mar-2024 19:27 | ASN Update Bot | Added |
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