CEN21LA031 · Piper PA28 140
Piper PA28 140 · Accident: loss of engine power (total) en route
From Bulverde Airpark (1T8) to Austin Bergstrom International Airport (KAUS)
Event
- NTSB case
- CEN21LA031
- 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 140
- 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
- N5932U
- Operator
- Unknown
- Onboard fatalities
- Unknown
- Route
- From Bulverde Airpark (1T8), Bulverde, TXTo Austin Bergstrom International Airport (KAUS), Austin, TX
- Aircraft age
- About 49 years (built 1971)
- 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
- En route
- 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 (total)
- 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
- Aircraft › Fluids/miscellaneous hardware
- Personnel issues › Task performance
Approximate · Coordinates from the NTSB case API, which marks them as estimated or does not say; no uncertainty radius is established.
NTSB narrative
During a night training flight, the flight instructor and student pilot experienced a total loss of engine power and executed a forced landing onto rough terrain, which damaged the airplane’s right-wing spar. Postaccident examination of the airplane revealed a nearly empty oil reservoir and oil residue on the underside of the fuselage and elevator, with significant thermal damage to the engine. The examination also found a disconnected oil line fitting. No material or structural anomalies were noted with the oil line or fitting.
The engine had been recently overhauled, and the two mechanics who performed the overhaul stated it was very possible that they did not properly torque the oil line fitting. Following the accident, the overhaul facility implemented a requirement to torque seal applicable components to help ensure compliance with torque specifications.
Probable cause
An improperly torqued oil line fitting during an engine overhaul, which resulted in oil exhaustion and a total loss of engine power.
Verbatim NTSB analysis and probable cause from the NTSB dataset
Sources
NTSB record CEN21LA031
- Event ID
- 20201027102197
- Case number
- CEN21LA031
- 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: local date, investigation status, coordinates, cause areas. Values present in the bulk record are kept.
- The date is the local date; the NTSB stores the UTC date 2020-10-21.
- API snapshot SHA-256: f687dc59f99a98945078188d640b4791150ef081a906f1ce4c2b993d3361fe8a; retrieved 2026-09-16T13:17:45.856Z.