CEN17LA314 · Hughes 369D
Patrol Helicopters Hughes 369D · Accident: low altitude operation/event while maneuvering
From Villa Grove, CO to an unrecorded destination
Event
- NTSB case
- CEN17LA314
- 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
- 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 369D
- 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
- N58424
- Operator
- Patrol Helicopters
- Onboard fatalities
- Unknown
- Route
- From Villa Grove, COTo not recorded
- Aircraft age
- About 38 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 133: Rotorcraft Ext. Load
- 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
- Pole
- 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 › Psychological
Approximate · Coordinates as recorded by the NTSB; no uncertainty radius is established.
NTSB narrative
The commercial pilot was conducting external load operations in the helicopter to assist power line construction. While maneuvering the helicopter away from a tower at low altitude, the pilot flew the helicopter to the right while planning on backing up at the same time. The helicopter's speed to the right was faster than he had planned. Subsequently, the helicopter's main rotor hit a tower before it came into the pilot's view, and the helicopter then impacted terrain.
The pilot reported that the helicopter did not have any mechanical malfunctions or failures that would have precluded normal operation. Given the pilot's statement, it is likely that he was not adequately monitoring the environment during low-level maneuvering among power line towers and failed to see a tower before the main rotors hit it.
Probable cause
The pilot’s failure to maintain main rotor clearance from a power line tower during low-level maneuvering.
Verbatim NTSB analysis and probable cause from the NTSB dataset
Sources
NTSB record CEN17LA314
- Event ID
- 20170811X45816
- Case number
- CEN17LA314
- 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. 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: d7e8704333fac14e471a52733492c68f60c3f91a8c6e1b11c5fecda07497a92f; retrieved 2026-09-16T05:41:46.397Z.