DEN01LA067 · Robinson R22 BETA
Robinson R22 BETA · Accident: rotor failure/malfunction en route
From Northeast Wyoming Regional Airport (GCC) to Bozeman Yellowstone International Airport (BZN)
Event
- NTSB case
- DEN01LA067
- 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
Robinson R22 BETA
- Aircraft type
- Robinson R22
- 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
- N144MB
- Operator
- Unknown
- Onboard fatalities
- Unknown
- Route
- From Northeast Wyoming Regional Airport (GCC), Gillette, WYTo Bozeman Yellowstone International Airport (BZN), Bozeman, MT
- 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
- En route · cruise
- 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
- Rotor failure/malfunction
- 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
- Rotor drive system, clutch assembly › Failure, total
Approximate · Coordinates as recorded by the NTSB; no uncertainty radius is established.
NTSB narrative
Approximately 20 minutes after takeoff on a cross-country flight, the pilot noticed the clutch light was on and he smelled burning rubber. The pilot conducted a power on autorotation and at approximately 50 feet above the ground, he heard a loud "pop" and the aircraft "dropped" to the ground, skidded about 15 feet, and rolled over on its side when a skid collapsed. Inspection revealed that the upper clutch actuator bearing had failed. All required inspections regarding the bearing assembly had been performed. Procedures used by the manufacturer require both the pilot and mechanic to listen for unusual bearing noise at specific intervals.
Probable cause
failure of the rotor drive system clutch assembly which rendered the aircraft uncontrollable.
Verbatim NTSB analysis and probable cause from the NTSB dataset
Sources
NTSB record DEN01LA067
- Event ID
- 20010319X00606
- Case number
- DEN01LA067
- 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: 475b66785ae5f4e7f5c5c7be404331f313078accc4ca8599c04b6b8b20065028; retrieved 2026-09-22T12:06:16.901Z.