ERA24LA392 · Piper PA28 161
Piper PA28 161 · Accident: loss of engine power (partial) during initial climb
Event
- NTSB case
- ERA24LA392
- 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
- Event fatalities
- Unknown
- Ground fatalities
- Unknown
- 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 PA28 161
- Aircraft type
- Piper PA28
- 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
- N4298V
- Operator
- Airventures
- Onboard fatalities
- Unknown
- Route
- From not recordedTo not recorded
- Aircraft age
- About 41 years (built 1983)
- 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
- Defining eventThe 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
- Loss of engine power (partial)
- 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
- Aircraft › Aircraft power plant
- Organizational issues › Development
Approximate · Coordinates from the NTSB case API, which marks them as estimated or does not say; no uncertainty radius is established.
NTSB narrative
The flight instructor and student pilot had completed maneuvers over the local area before the student pilot performed a touch-and-go landing. During initial climb after the touch-and-go landing, about 200 to 300 ft above ground level, the engine began to run rough and the airplane stopped climbing. The flight instructor then took control of the airplane from the student pilot and made a right turn for a forced landing on a perpendicular runway. The flight instructor stated that during the landing attempt, the engine power did not reduce to idle when the instructor pulled the throttle lever fully aft. The airplane subsequently touched down long on the 5,000-ft runway and traveled off the end and down an embankment, coming to rest upright.
Postaccident examination of the engine did not reveal any anomalies with the throttle linkage. However, the No. 3 cylinder exhaust valve was stuck in the open position. Metallurgical examination of the No. 3 cylinder revealed rough residues and patches in the valve guide, as well as valve guide material that had adhered to the exhaust valve stem. Caked residues were observed around the exhaust valve tip. Measurements of the exhaust valve guide bore’s inside diameter were all below specification for a new valve guide, and the diametral valve-to-guide clearances were also below specification at the middle and inboard end of the guide.
The cylinder had been operated for about 1,072 hours since it was installed new about 3 years before the accident. Available evidence indicates that, over time, the improperly manufactured exhaust valve guide bore allowed a build-up of residual material that led to the exhaust valve becoming stuck in the open position and a partial loss of engine power.
Probable cause
Improper manufacture of a cylinder exhaust valve guide by the engine manufacturer, which resulted in a stuck exhaust valve and a partial loss of engine power during initial climb.
Verbatim NTSB analysis and probable cause from the NTSB dataset
Sources
NTSB record ERA24LA392
- Event ID
- 20240924195170
- Case number
- ERA24LA392
- Dataset
- full-current
- Source SHA-256
- 5cf380f0061817c0331a6b2d8cc7e0ee3a79bea469a1001dc5c10e56f35f5ab3
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, coordinates, cause areas. 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: 685d33936ee32b9b16fc87217c12819788f805ebf89ee4f7a1347b291c624fe2; retrieved 2026-09-16T19:18:07.676Z.