CEN21LA139 · Hughes 369 D
Hughes 369 D · Accident: low altitude operation/event while maneuvering
From Lone Oak, TX (private airstrip) to an unrecorded destination
Event
- NTSB case
- CEN21LA139
- 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
Hughes 369 D
- Aircraft type
- Hughes 369
- Category
- Helicopter
- 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
- N58431
- Operator
- Unknown
- Onboard fatalities
- Unknown
- Route
- From Lone Oak, TX (private airstrip)To not recorded
- Aircraft age
- About 42 years (built 1979)
- 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
- Maneuvering · low-altitude flying
- 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
- Low altitude operation/event
- 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
- Wire
- 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 oper/perf/capability
- Environmental issues › Physical environment
- Personnel issues › Action/decision
Approximate · Coordinates from the NTSB case API, which marks them as estimated or does not say; no uncertainty radius is established.
NTSB narrative
The pilot reported that the helicopter struck a power line while he pursued a small group of pigs during an aerial hunting flight. The helicopter was about 30 ft. above ground level when it struck an inactive power line running from a support pole to an abandoned farmhouse. The pilot executed a “quickstop” and landed normally in the field. Both power lines were cut, and the helicopter sustained substantial damage to one main rotor blade, one tail rotor blade, and the vertical stabilizer. There were no anomalies associated with the helicopter before the accident. According to the pilot, the operator had not previously conducted any flights at that location. He noted that, in the future, the operator will conduct a “recon of the area [and] not get below the tree line in an unfamiliar area.”
Probable cause
The pilot’s failure to maintain clearance from a power line during low-level maneuvering.
Verbatim NTSB analysis and probable cause from the NTSB dataset
Sources
NTSB record CEN21LA139
- Event ID
- 20210302102690
- Case number
- CEN21LA139
- 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: d0299fa0a1f1adfe91715db700b0d0f1b0b26973bf6966bb57d10776c62b9946; retrieved 2026-09-16T13:45:19.400Z.