# NTSB CHI98LA267: Cessna 150M, N9251U, Litchfield, IL, July 21, 1998 - Type: NTSB accident investigation - Classification: Accident · No injuries · Limited investigation · Final report - Date: July 21, 1998, 15:00 local (20:00 UTC) - Place: Litchfield, IL - Coordinates: 39.170249, -89.649864 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=39.1702&lon=-89.6499&mi=10 - Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 1 uninjured - Status: Completed, report February 15, 2001 - Report: Approved by Office Director - NTSB case key (mKey): 43097 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI98LA267 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/43097/pdf - Page: https://openairdocs.org/ntsb/CHI98LA267 ## Probable cause Loss of engine power due to an open exhaust valve and low cylinder compression. A related factor was the tailwind. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Loss of engine power, cruise - engine assembly,valve,exhaust - open (cause) - engine assembly,cylinder - compression (cause) - Forced landing, descent - emergency - On ground/water encounter with terrain/water, landing - roll - weather condition - tailwind (contributing factor) - directional control - not maintained, pilot in command (cause) ## Analysis 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. ## Factual narrative On July 21, 1998, at 1500 central daylight time, a Cessna 150M, N9251U, piloted by a student pilot, received substantial damage on impact with a pole following a forced landing on runway 09 (3901' x 75', asphalt/dry) at Litchfield Municipal Airport, near Litchfield, Illinois. Visual meteorological conditions prevailed at the time of the accident. The personal 14 CFR Part 91 student-solo cross-country flight was operating on a flight plan. The pilot reported no injuries. The flight departed Greater Peoria Regional Airport, near Peoria, Illinois, at 1345 and was returning to St. Louis Regional Airport near Alton, Illinois. The pilot reported that the engine began to vibrate and run very rough at approximately 1445, near Carlinsville, Illinois, 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 to Litchfield Municipal. 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 towards right into the grass, 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 by a Federal Aviation Administration Maintenance Inspector 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 Pilot's Operating Handbook for a Cessna 150M states that the maximum demonstrated crosswind velocity is 12 knots. A Wind Components graph containing wind component, headwind or tailwind, versus crosswind component is also included. ## Aircraft - Registration: [N9251U](https://openairdocs.org/aircraft/N9251U), registered now, S/N 15078201 (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: 15078201 - Airframe hours: 6541 - Engines: Continental O-200-A 100 horsepower reciprocating - Damage: Substantial damage - Flight: Instructional, Part 91 - Operator: Langa Air Academy - Registered owner: Richard Lyon - Airworthiness certificate: Standard, Normal - Last inspection: Annual, June 18, 1998, 48 hours before - Departed: PIA, PEORIA, IL - Destination: ALN, ALTON, IL - Flight plan: VFR - Airport: 3LF, Litchfield Municipal, runway 9, 3,901 × 75 ft, asphalt ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 35; student; medical: class 3, valid medical--no waivers/lim.; seat: left; flight hours: 33 total, 33 in this make and model, 14 as pilot in command, 23 in the last 90 days, 9 in the last 30 days, 4 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 220° at 10 knots - Visibility: 8 statute miles - Lowest ceiling: none - Temperature: 95 °F, dew point 75 °F - Altimeter: 29.00 inHg - Observed at: ALN, 24 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 19980721016819A](https://openairdocs.org/incident/19980721016819A), Jul 21, 1998: Cessna 150M, Litchfield, IL, Substantial damage. (.19) On July 21, 1998, at 1500 central daylight time, a Cessna 150M, N9251U, operated by a student pilot, received substantial damage on impact with a pole… 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. --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.