# NTSB DEN99IA136: Beech 1900D, N101UX, Denver, CO, August 5, 1999 - Type: NTSB incident investigation - Classification: Incident · No injuries · Incident investigation · Final report - Date: August 5, 1999, 10:55 local (16:55 UTC) - Place: Denver, CO - Coordinates: 39.849628, -104.700759 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=39.8496&lon=-104.7008&mi=10 - Phase of flight: [Taxi](https://openairdocs.org/ntsb-phases/250) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 22 uninjured - Status: Completed, report November 30, 2000 - Report: Approved by Office Director - NTSB case key (mKey): 46914 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN99IA136 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/46914/pdf - Page: https://openairdocs.org/ntsb/DEN99IA136 ## Probable cause (aircraft 2) See cause/factor narrative for DEN 99-I-A136A. ## Probable cause (aircraft 1) 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. ## Analysis (aircraft 2) See narrative for DEN 99-I-A136A. ## Analysis (aircraft 1) 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. ## Factual narrative (aircraft 2) See Narrative for DEN 99-I-A136A. ## Factual narrative (aircraft 1) On August 5, 1999, at 1059 mountain daylight time, a Beech 1900D, N101UX, operated by Great Lakes Aviation and doing business as United Express, and a Beech C90A, N91KA, owned and operated by its pilot, made contact with each other as both airplanes were taxiing at Denver International Airport, Denver, Colorado. Both airplanes sustained minor damage. There were no injuries to the airline transport rated captain, commercial rated first officer, and 19 passengers aboard N101UX, or to the private pilot aboard N91KA. Instrument meteorological conditions prevailed, and the pilots of both airplanes had filed IFR flight plans. N101UX was being operated as flight 6326, scheduled domestic passenger service between Riverton, Wyoming, and Denver, Colorado, under Title 14 CFR Part 121. N91KA was being operated as a business flight under Title 14 CFR Part 91. The flight of N101UX originated approximately 0900. The flight of N91KA had not yet originated. An incident report was submitted by the company and signed jointly by the captain and first officer. The report indicated that the first officer was flying the airplane. During the approach and landing, neither she 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. The statement indicates that 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. According to the statement, it was then that they were told to yield to the approaching traffic. According to the incident report submitted by the pilot of N91KA, he had been cleared to taxi from Signature Aviation (a fixed base operator at the airport) 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. He heard a noise from the rear of the airplane and suspected he had been struck by the Beech 1900D. Postincident inspection disclosed the winglet on N101UX was cracked. The outboard elevator cap on N91KA was bent, and there was a dent in a fairing. Although instrument meteorological conditions prevailed at the time of the incident, surface visibility was 3 statute miles in mist. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - On ground/water collision with object, taxi - from landing - object - aircraft moving on ground (contributing factor) - atc clearance - exceeded, flightcrew (cause) - visual lookout - inadequate, flightcrew (cause) - visual lookout - inadequate, pilot of other aircraft (cause) - On ground/water collision with object, taxi - to takeoff - object - aircraft moving on ground (contributing factor) - visual lookout - inadequate, pilot in command (cause) - atc clearance - exceeded, flightcrew (cause) - visual lookout - inadequate, flightcrew (cause) ## Aircraft 1 - Registration: [N101UX](https://openairdocs.org/deregistered/N101UX-2004-08-25), registration cancelled 2004-08-25, S/N UE-101, built 1994 (OpenAirDocs) - Reported make and model: Beech 1900D - Registry model: [Beech 1900D](https://openairdocs.org/model/beech-1900d) (registry code 1154162) (OpenAirDocs) - Registry engine: [Pratt & Whitney Canada PT6A-6 series](https://openairdocs.org/engine/pratt-whitney-canada-pt6a-6-series) (registry code 52150, turbo-prop) (OpenAirDocs) - Category: Airplane - Serial number: UE-101 - Airframe hours: 13674 - Engines: P&W PT6A-67D 1279 horsepower turbo prop - Damage: Minor damage - Flight: Part 121 - Registered owner: Great Lakes Aviation - Airworthiness certificate: Standard, Normal - Last inspection: Continuous airworthiness, July 29, 1999, 99 hours before - Departed: RIW, RIVERTON, WY - Destination: DEN - Flight plan: IFR - Airport: DEN, Denver International, runway 35L, 12,000 × 150 ft, concrete ## Aircraft 2 - Registration: [N91KA](https://openairdocs.org/aircraft/N91KA), registered now, S/N LJ-1232 (OpenAirDocs) - Reported make and model: Beech C90A - Registry model: [Beech C90](https://openairdocs.org/model/beech-c90) (registry code 1152913) (OpenAirDocs) - Category: Airplane - Serial number: LJ-1232 - Engines: P&W PT6A-21 550 horsepower turbo prop - Damage: Minor damage - Flight: Business, Part 91 - Registered owner: Sun Desert Enterprises - Airworthiness certificate: Standard, Normal - Departed: DEN - Destination: E15, GRAHAM, TX - Flight plan: IFR - Airport: DEN, Denver International ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot, aircraft N101UX; age 36; airline transport, commercial; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane; medical: class 1, valid medical--no waivers/lim.; seat: left; flight hours: 2,700 total, 1,200 in this make and model, 1,900 as pilot in command - Pilot, aircraft N91KA; age 54; private; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 3, valid medical--w/ waivers/lim; seat: left; flight hours: 3,190 total, 100 in this make and model, 3,026 as pilot in command, 50 in the last 90 days, 20 in the last 30 days, 2 in the last 24 hours ## Weather - Conditions: Instrument (IMC), Day - Wind: 290° at 6 knots - Visibility: 1.5 statute miles - Lowest ceiling: 600 ft broken - Temperature: 61 °F, dew point 59 °F - Altimeter: 30.00 inHg - Observed at: DEN ## FAA reports on this event (1) The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs). - [Incident 19990805025949I](https://openairdocs.org/incident/19990805025949I), Aug 5, 1999: Beech 1900D, Denver, CO, Minor damage. (-23) Pilot landed Beech 1900D, N101UX, flight number GLA6326, on runway 35L. Tower approved turnoff of either high speed turnoff and to contact ground. The… From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.