CHI97LA299 · Beech C23
Beech C23 · Accident: partial loss of engine power (mechanical failure) on approach
From University of Illinois Willard Airport (CMI) to an unrecorded destination
Event
- NTSB case
- CHI97LA299
- Event typeAccident: someone killed or seriously injured, or the aircraft substantially damaged (NTSB definition). Incident: an occurrence that affected or could have affected safety, short of that. Glossary
- Accident
- InvestigationHow far the investigation had got when the record was published: preliminary, ongoing, final or completed. Unknown where the source does not say. Glossary
- Completed
- API-reported fatalities
- 0 · all aircraft and ground
- Ground fatalities
- 0
- OperationWhat kind of flying it was, grouped by the rules it flew under: airline (US Part 121), air taxi and commuter (Part 135), general aviation (Part 91 and similar), military or government. Glossary
- General aviation
- WeatherVisual meteorological conditions (VMC): good enough to fly by looking outside. Instrument conditions (IMC): cloud or low visibility, flying by instruments. Glossary
- Visual Meteorological Cond
Beech C23
- Aircraft type
- Beechcraft 23
- Category
- Airplane
- RegistrationThe aircraft's tail number, such as N12345 or G-ABCD. Registrations are reissued, so the same one years apart can be a different aircraft. Glossary
- N1851Z
- Operator
- Unknown
- Onboard fatalities
- Unknown
- Route
- From University of Illinois Willard Airport (CMI), ILTo not recorded
- Aircraft age
- Not recorded
- Flight rulesThe regulations the flight operated under: in the US, Part 91 (general aviation), Part 121 (airlines), Part 135 (air taxi and commuter) and others; for flights abroad, the NTSB's coarser commercial or non-commercial code. Glossary
- Part 91: General Aviation
- Phase of flightThe stage of the flight when things started to go wrong: standing, taxi, takeoff, initial climb, en route, maneuvering, approach or landing. Glossary
- Approach
- First occurrenceThe single coded event the NTSB judges best describes what happened (records from 2008 on). Older records name the first occurrence in the sequence instead. Glossary
- Partial loss of engine power (mechanical failure)
- DamageDestroyed: beyond practical repair. Substantial: damage that affects the structure, performance or handling and normally needs major repair. Minor: less than that. Glossary
- Substantial
Cause areas
- Miscellaneous, engine › Undetermined
Approximate · Coordinates as recorded by the NTSB; no uncertainty radius is established.
NTSB narrative
The instructor pilot (CFI) said that they were 4 miles from the airport, and in radio contact with the control tower, when the airplane's engine began to run rough and the rpm dropped from 2500 to 2200 rpm. The CFI notified the control tower and requested a closer runway. The CFI trouble shot the problem, but said '. . . nothing worked, and the rpm dropped to 2000. . . . Oil began to cover the windscreen and [oil] pressure dropped to zero. [The] rpm was decreasing and I believed seizure was eminent.' The CFI 'pulled the mixture to lean' and attempted to glide to the runway, but noted that he was low in altitude. 'I sidestepped to aim for the grass and avoid [the runway] lighting and the localizer. I couldn't make the grass, so I landed in the corn.' Examination of the engine revealed that all eight valve lifters were broken. Examination of the lifters and lifter pieces showed brittle fractures due to overload. Some areas on the lifter faces showed evidence of heavy loading from the camshaft.
Probable cause
an undetermined engine and/or oil system failure that resulted in an oil leak and subsequent loss of engine power. A related factor was: high vegetation (corn crop) in the emergency landing area.
Verbatim NTSB analysis and probable cause from the NTSB dataset
Sources
NTSB record CHI97LA299
- Event ID
- 20001208X08820
- Case number
- CHI97LA299
- Dataset
- historical-pre2008
- Source SHA-256
- 89e2df6d848e7ab3b42e7d7c7a03ff403303057a26ca04c95b3ea67201c3ce74
Source notes (4)
- Unreviewed is an editorial label, not an investigation status. API-sourced is not report-checked or human-reviewed. Explicit event totals are used without summing aircraft injury tables; onboard allocation is withheld. Unknown values remain unknown. The operation category is mapped from the NTSB-reported FAR part and has not been reviewed.
- Filled from the NTSB case API where the bulk record had no value: investigation status. Values present in the bulk record are kept.
- The date is the local date, which is the same as the UTC date the NTSB stores.
- API snapshot SHA-256: 72fedab3a8f1c0fd3a2487fd03970963d35c8ad00097c12788f3951488e32a95; retrieved 2026-09-22T18:32:55.464Z.