DEN85FTM04 · Kokes SCORPION 133 SCORPION 1
Kokes SCORPION 133 SCORPION 1 · Accident while taxiing
From Grand Junction Regional Airport (GJT) to Grand Junction Regional Airport (GJT)
Event
- NTSB case
- DEN85FTM04
- 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
Kokes SCORPION 133 SCORPION 1
- Aircraft type
- Kokes SCORPION 133
- 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
- N45877
- Operator
- Unknown
- Onboard fatalities
- Unknown
- Route
- From Grand Junction Regional Airport (GJT)To Grand Junction Regional Airport (GJT)
- 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
- Taxi · aerial
- 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
- Miscellaneous/other
- 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
- Pilot in command › Aircraft handling, not maintained
Approximate · Coordinates as recorded by the NTSB; no uncertainty radius is established.
NTSB narrative
A GROUP OF PLTS WERE PREPARING FOR AN AIRSHOW FLYBY. AS A FORMATION OF AIRPLANES WERE BEING TAXIED TO RWY 29, THE PLT OF A HOME BUILT SCORPION 133 HELICOPTER, N45877, WAS CLEARED TO AIR TAXI ACROSS RWY 29 & PROCEED TO RWY 22. AS THE HELICOPTER PLT WAS APPROACHING RWY 22 & WAS IN A DESCENDING LEFT TURN, A HOME BUILT AIRPLANE WAS TAKING OFF ON THE SAME RWY (22). TO AVOID A POSSIBLE COLLISION, THE HELICOPTER PLT MADE A HARD LEFT TURN & 'PUSHED IT TO THE GROUND' BETWEEN RWY 22 & THE PARALLEL TAXIWAY. DURING TOUCHDOWN, THE HELICOPTER ROLLED OVER. THE PLT STATED THAT THE LANDING WAS NOT HARD. HE BELIEVED THAT GYROSCOPIC PRECESSION CAUSED THE HELICOPTER TO ROLL OVER.
Verbatim NTSB analysis from the NTSB dataset
Sources
NTSB record DEN85FTM04
- Event ID
- 20001214X36740
- Case number
- DEN85FTM04
- 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: 838dcdcf9f1bddea48826a3b0d042cace6ccb51d8784911a838469957244e0b5; retrieved 2026-09-23T17:05:02.075Z.