FTW91LA004 · Waco RNF
Waco RNF · Accident: total loss of engine power (mechanical failure) during initial climb
From T28 to No airport
Event
- NTSB case
- FTW91LA004
- 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
Waco RNF
- Aircraft type
- Waco RNF
- 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
- N11270
- Operator
- Mccluney, Cliff A. · private individual
- Onboard fatalities
- Unknown
- Route
- From T28To No airport
- 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
- Total 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
- Fuel contamination
- 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, valve, intake › Failure, total
Approximate · Coordinates as recorded by the NTSB; no uncertainty radius is established.
NTSB narrative
THE ENGINE LOST PARTIAL POWER AS THE PILOT TURNED CROSSWIND AFTER TAKEOFF, FOLLOWED B A COMPLETE POWER LOSS DURING THE TURN TO DOWNWIND. THE PILOT SET UP FOR A FORCED LANDING TO THE BEST AVAILABLE FIELD WHICH WAS COVERED WITH BRUSH AND TREES. JUST PRIOR TO TOUCHDOWN, THE ENGINE HAD A MOMENTARY SURGE OF POWER AND THEN QUIT AGAIN. DURING THE LANDING ROLL, THE LEFT MAIN LANDING GEAR COLLAPSED AND THE AIRPLANE NOSED OVER. INVESTIGATION REVEALED THAT THE NO. 6 CYLINDER INTAKE VALVE SPRING WAS BROKEN AND THE CYLINDER WAS RUNNING COLD. ADDITIONALLY, PARTICULATE CONTAMINATION WAS FOUND IN THE FUEL SYSTEM.
Probable cause
THE FAILURE OF A CYLINDER INTAKE VALVE SPRING.
Verbatim NTSB analysis and probable cause from the NTSB dataset
Sources
NTSB record FTW91LA004
- Event ID
- 20001212X24466
- Case number
- FTW91LA004
- 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: 3904c7090b618b767d837da055b8a777d4798d903dfe20fc9f4a3c5586cfd14e; retrieved 2026-09-21T23:43:20.707Z.