CHI89DEK01 · Piper PA-28
Piper PA-28 · Accident: partial loss of engine power (mechanical failure) during initial climb
From Union Island International Airport (UNI) to I77 · Cincinnati, OH
Event
- NTSB case
- CHI89DEK01
- 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
Piper PA-28
- Aircraft type
- Piper PA-28
- 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
- N40973
- Operator
- Unknown
- Onboard fatalities
- Unknown
- Route
- From Union Island International Airport (UNI)To I77 · Cincinnati, OH
- 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
- Initial climb
- 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)
- Also codedOther events the NTSB coded in the sequence, such as a wire strike after a loss of power. Flight Findings uses them for its kinds of event. Glossary
- Tree(s)
- 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
- Engine assembly, push rod › Bent
- Engine assembly, valve, exhaust › Seized
Approximate · Coordinates as recorded by the NTSB; no uncertainty radius is established.
NTSB narrative
DRG THE INITIAL CLIMB AFTER TAKEOFF, A PARTIAL POWER LOSS OF THE ENG OCCURRED & THE PLT WAS FORCED TO LAND. UNABLE TO RETURN TO THE ARPT, HE SELECTED THE ONLY AVAILABLE LANDING SITE, WHICH WAS ABOUT 300 FT LONG & 200 WIDE. THIS AREA WAS BORDERED BY TREES & 30 FT POWER LINES. JUST BEFORE TOUCHDOWN, THE RIGHT WING SEVERED LEAVES FROM A TREE. SUBSEQUENTLY, THE ACFT SLID INTO ANOTHER TREE & A FENCE. AN EXAM OF THE ENG REVEALED THE #4 EXHAUST VALVE WAS STUCK IN THE OPEN POSITION & ITS RESPECTIVE PUSH ROD WAS BENT.
Probable cause
SEIZURE OF THE #4 EXHAUST VALVE AND BENDING OF ITS RESPECTIVE PUSH ROD, WHICH RESULTED IN A SIGNIFICANT LOSS OF ENGINE POWER. CONTRIBUTING FACTORS WERE: LACK OF A SUITABLE EMERGENCY LANDING AREA, TREES, AND THE FENCE.
Verbatim NTSB analysis and probable cause from the NTSB dataset
Sources
NTSB record CHI89DEK01
- Event ID
- 20001213X28512
- Case number
- CHI89DEK01
- 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: 033ee50e9fbbd30d94882b5e6334d3fb1cf98a557f1cceb6044042ef2a856063; retrieved 2026-09-21T15:54:02.971Z.