Cessna 150M accident near Litchfield, Illinois, July 21, 1998
On July 21, 1998 at about 8:00 pm local time, a Cessna 150M, registered N9251U, was substantially damaged in an accident near Litchfield, Illinois (Litchfield Municipal). It was an instructional flight under general aviation rules (Part 91). No one was hurt; 1 person was on board or involved. The weather was visual conditions (good weather).
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The NTSB's probable cause their words, unchanged
Loss of engine power due to an open exhaust valve and low cylinder compression. A related factor was the tailwind.
Source: NTSB aviation accident database, copy made October 4, 2026. Docket and reports at the NTSB.
What the record shows
- Date
- July 21, 1998 · about 8:00 pm local time
- Place
- Litchfield, Illinois · Litchfield Municipal · map
- Type
- Accident
- Injuries
- No one was hurt; 1 person was on board or involved.
- Weather
- visual conditions (good weather)
- Aircraft
- Cessna 150M · all 150Ms on the register
- Registration
- N9251U · registry record · serial 15078201
- Damage
- Substantial damage
- Flight
- Instructional flight · general aviation rules (Part 91)
The NTSB's narrative final · quoted from the NTSB record
The pilot reported that the engine began to vibrate and run very rough at an altitude of 4500' MSL. He noticed an immediate loss of power and was unable to maintain altitude. The pilot then cycled the magnetos, increased the mixture control to full rich, confirmed that the fuel selector was in the 'ON' position and applied carburetor heat, all of which had no effect. Being uncertain as to the cause of the power loss and concerned that the engine would quit operating, the pilot declared a mayday and requested vectors. At the time the pilot made visual contact with the airport, the aircraft was at an altitude of 1100' MSL. The pilot chose to land on runway 09 even though there would be a quartering tailwind present upon landing. During the landing rollout, the pilot felt the tail swing to the left at which time the airplane departed the runway toward right, into the grass and impacted a concrete culvert, separated the right main wheel and slid to a stop. The pilot stated that landing was made with full flaps. Examination of the engine revealed that the number three cylinder had a compression of 35/80 and the number four exhaust valve was stuck in the full open position.
The complete narrative as the NTSB published it. The NTSB's docket holds the report as a PDF and any photographs, statements and other documents from the investigation.
The factual record from the NTSB's investigation tables, in plain English
Pilot
- Certificate: student
- Flight time: 33 hours in all; 33 in this make and model; 23 in the last 90 days; 9 in the last 30 days; 14 as pilot in command
- Medical certificate: Class 3 (valid medical--no waivers/lim.)
- Seat: left
The aircraft
- Airframe total time: 6,541 hours
- Last inspection: annual inspection, June 18, 1998; 48 hours since
- Maximum gross weight: 1,600 lb
- Seats: 2
- Landing gear: fixed
- Engine: Continental O-200-A (piston); 0 hours total
- Operator: Langa Air Academy
The flight
- Departed from: PIA Peoria IL at 6:45 pm
- Destination: ALN Alton IL
- Flight plan: VFR
- Runway 9, 3,901 ft by 75 ft
Weather at the time
- Light: daylight
- Wind: from 220° at 10 knots
- Visibility: 8 statute miles
- Sky: clear
- Temperature: 95°F (35°C), dew point 75°F (24°C)
- Altimeter: 29.00 inHg
- Observation at 7:45 pm from ALN, 24 miles away
Injuries
| Fatal | Serious | Minor | None | |
|---|---|---|---|---|
| Crew | 1 |
About this page
Everything above comes from the NTSB's public accident database: the narrative, probable cause and findings are the NTSB's own words, and the coded tables behind its report (pilot, aircraft, flight, weather, injuries, sequence of events) are written out in plain English. Pilots' ages, home towns and medical details are left out on purpose. The docket at the NTSB holds the report as a PDF and the investigation's photographs and documents. This site never names pilots, passengers or anyone else involved. A preliminary report describes what is known soon after the event and can change; the final report, with the probable cause, usually follows one to two years later and this page is refreshed when it does. Case number CHI98LA267.