United Express Beech 1900D incident
Beech 1900D and Beech C90A · Incident: on ground/water collision with object while taxiing
Event
- NTSB case
- DEN99IA136
- 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
- Incident
- 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
- Airline
- WeatherVisual meteorological conditions (VMC): good enough to fly by looking outside. Instrument conditions (IMC): cloud or low visibility, flying by instruments. Glossary
- Instrument Meteorological Cond
Aircraft 1 · Beech 1900D
- Aircraft type
- Beechcraft 1900
- 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
- N101UX
- Operator
- United Express
- Onboard fatalities
- Unknown
- Route
- From Central Wyoming Regional Airport (RIW), Riverton, WYTo Denver International Airport (DEN)
- 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 121: Air Carrier
- 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 · from runway
- 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
- On ground/water collision with object
- DamageDestroyed: beyond practical repair. Substantial: damage that affects the structure, performance or handling and normally needs major repair. Minor: less than that. Glossary
- Minor
Aircraft 2 · Beech C90A
- Aircraft type
- Beechcraft 90
- 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
- N91KA
- Operator
- Unknown
- Onboard fatalities
- Unknown
- Route
- From Denver International Airport (DEN)To E15 · Graham, TX
- 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 · to runway
- 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
- On ground/water collision with object
- DamageDestroyed: beyond practical repair. Substantial: damage that affects the structure, performance or handling and normally needs major repair. Minor: less than that. Glossary
- Minor
Cause areas
- Flightcrew › Atc clearance, exceeded
- Flightcrew › Visual lookout, inadequate
- Pilot in command › Visual lookout, inadequate
- Pilot of other aircraft › Visual lookout, inadequate
Approximate · Coordinates as recorded by the NTSB; no uncertainty radius is established.
NTSB narrative
During the approach and landing, neither the first officer nor the captain observed any traffic on taxiway M[ike]. After landing of runway 35L[eft], the local controller instructed the crew to 'exit [on] either high speed taxiway,' and to contact ground control. Because of the long landing roll and low exit speed, the first officer elected to exit the runway on high speed turnoff M6. After crossing the 'Hold Short' lines, the captain contacted ground control and was given instructions to 'taxi via Mike, enter the ramp, Bravo November, and give way to the King Air.' The captain then sighted the approaching Beech C90A, and maximum brakes were applied. The pilot of N91KA had been cleared to taxi from the general aviation ramp to runway 8 via taxiway M. As he passed a high speed exit, he saw the Beech 1900D out the right cockpit window and heard the ground controller tell the pilot to yield.
Probable cause
The flight crew exceeding the limits of their ATC clearance, and the failure of both flight crews to maintain adequate visual lookouts. A factor was the other aircraft taxiing on the ground.
Verbatim NTSB analysis and probable cause from the NTSB dataset
Sources
NTSB record DEN99IA136
- Event ID
- 20001212X19480
- Case number
- DEN99IA136
- Dataset
- historical-pre2008
- Source SHA-256
- 89e2df6d848e7ab3b42e7d7c7a03ff403303057a26ca04c95b3ea67201c3ce74
Source notes (5)
- 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: e61fa31af8ed2f41a928308ab2e0d4e98ac32f1711b3b87061810e575f6a58cf; retrieved 2026-09-18T16:54:45.712Z.
- The NTSB's operator name is blank for N101UX; the operator shown is the name the NTSB records it doing business as.