Cessna 150M N9410U

Summary

On 21 April 1988 at about 13:45 local time, a Cessna 150M registered N9410U, operated by Southern Illinois University, was involved in an accident near Zeigler, Illinois, United States. 2 people were on board and nobody was injured. The aircraft was substantially damaged. No probable cause statement is available for this record.

Date

21 April 1988 at 13:45

Classification

Accident

Location

Zeigler, Illinois, United States

Coordinates

37.8895, -89.0506

Aircraft

Cessna 150M

Registration

N9410U

Category

Airplane

Engines

1

Operator

Southern Illinois University

Operating rule

Part 91: General Aviation

Purpose of flight

Instructional

Phase of flight

Not recorded

Route

Carbondale → Unknown

Aircraft damage

Substantial

Weather

VMC

Light

Day

NTSB number

CHI88LA099

Nobody was injured.

The NTSB has not published a probable cause for this record. No probable cause statement is present in the source data.

Nothing about the cause is stated here that is not in the source record.

Read the full NTSB narrative

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.

Quoted verbatim from the NTSB record.