# NTSB DEN03IA032: Hawker Siddeley HS-125-700A, N270KA, Telluride, CO, January 4, 2003 - Type: NTSB incident investigation - Classification: Incident · No injuries · Incident investigation · Final report - Date: January 4, 2003, 09:00 local (16:00 UTC) - Place: Telluride, CO - Coordinates: 37.953887, -107.908607 - Nearby events: https://openairdocs.org/map.md?lat=37.9539&lon=-107.9086&mi=10 - Phase of flight: [Standing](https://openairdocs.org/ntsb-phases/150) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 6 uninjured - Status: Completed, report August 26, 2003 - Report: Approved by Office Director - Parties: Federal Aviation Administration - NTSB case key (mKey): 56340 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN03IA032 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/56340/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=56340 - Page: https://openairdocs.org/ntsb/DEN03IA032 ## Probable cause the overheated and burned venturi fan motor. ## Analysis The crew had started the auxiliary power unit (APU) approximately 30 minutes prior to starting engines. The crew and 4 passengers were on board the airplane, when the crew started the number 2 engine and smelled smoke. The crew turned around to observe smoke in the cabin. The crew shut down the number 2 engine, the APU, and all electrical switches. The crew and passengers got off the airplane through the main cabin door. An inspection of the airplane revealed a venturi fan unit motor located aft of the rear cabin bulkhead had overheated and failed. Components and wiring in the vicinity of the venturi were charred. No other anomalies were found. The venturi was an older model identified in 1994 as being subject to fan motor overheating. A 1994 AD required that the older units be inspected every 4 years. The unit on the incident airplane was installed in 1999. ## Factual narrative On January 4, 2003, approximately 0900 mountain standard time, a Hawker Siddeley HS-125-700A, N270KA, operated by Key Air, Incorporated, and piloted by an airline transport pilot, encountered smoke in the cockpit during engine start in preparation for takeoff at the Telluride Regional Airport, Telluride, Colorado. The airplane was shut down and an emergency evacuation was accomplished. Airport fire department units responded to the airplane. The captain, first officer, and four passengers on board were not injured. Visual meteorological conditions prevailed at the time of the incident. The unscheduled, domestic business flight from Telluride, Colorado, to Oxford, Connecticut, was being conducted on an instrument flight rules plan under the provisions of Title 14 CFR Part 135. The cross-country flight was originating at the time of the incident. According to the company, the crew had started the auxiliary power unit (APU) approximately 30 minutes prior to starting engines. The crew and 4 passengers were on board the airplane. The crew started the number 2 engine and smelled smoke. They turned around to observe smoke in the cabin. The crew shut down the number 2 engine, the APU, and all electrical switches. The crew and passengers got off the airplane through the main cabin door. An inspection of the airplane revealed a venturi fan unit, located aft of the rear cabin bulkhead, was charred. Insulation, wires, and air ducts in the immediate vicinity of the unit were also charred. No other anomalies were found. An examination of the venturi fan unit showed the motor had overheated and subsequently failed. According to the company, the venturi unit was installed in 1999. The unit, part number 207640-10, serial number 53-3671, was an older model identified by Hawker, in 1994, as being subject to in-service failure due to the fan motor overheating and resulting in smoke generation in the cabin. On February 22, 1994, Hawker Aircraft issued an Alert Service Bulletin requiring the inspection of all existing units at that time. A few months later, an Airworthiness Directive was issued requiring a minimum inspection period of 4 years on the unit. The company's Chief Pilot stated that a new thermal fuse unit was produced in 1994 or 1995, which senses heat earlier and shuts the unit down before tripping the circuit breaker. Following the incident, the company replaced the venturi units in its other two Hawker airplanes with the thermal fuse type unit. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Airframe/component/system failure/malfunction, standing - engine(s) operating - electrical system,electric motor - overtemperature (cause) - electrical system,electric motor - burned (cause) - maintenance,modification - delayed, company/operator management ## Aircraft - Registration: N270KA (not matched to a registry record) - Reported make and model: Hawker Siddeley HS-125-700A - Category: Airplane - Serial number: NA0307 - Airframe hours: 12051.8 - Engines: Garrett-AiResearch TFE731-3R-1H 3700 lbs thrust turbo fan; Garrett-AiResearch TFE731-3R-1H 3700 lbs thrust turbo fan - Damage: Minor damage - Fire: On-Ground - Flight: Part 135 - Operator: Key Air Incorporated, doing business as Key Air Incorporated - Registered owner: Crusader Aviation, Inc. - Airworthiness certificate: Standard, Normal - Last inspection: Annual, September 24, 2002, 155.5 hours before - Departed: TEX, Telluride, CO - Destination: Oxford, CT - Flight plan: IFR - Airport: TEX, Telluride Regional Airport, runway 27, 6,870 × 100 ft, asphalt ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 61; injuries: none; airline transport; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane, helicopter; medical: class 1; last flight review December 4, 2002; seat: front; flight hours: 10,663 total, 3,060 in this make and model, 6,518 as pilot in command - Co-pilot; age 32; injuries: none; airline transport; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane; medical: class 1; last flight review August 30, 2002; seat: rear; flight hours: 4,650 total, 350 in this make and model, 1,600 as pilot in command, 150 in the last 90 days, 35 in the last 30 days ## Weather - Conditions: Visual (VMC), Day - Wind: 150° at 5 knots - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 48 °F, dew point 18 °F - Altimeter: 30.42 inHg - Observed at: TEX, 25 nm away ## FAA reports on this event (1) The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs). - [Accident 20030104000179A](https://openairdocs.org/incident/20030104000179A), Jan 4, 2003: Braero HS125700A, Telluride, CO, No damage. (.19) On January 4, 2003, approximately 0900 mountain standard time, a Hawker siddeley hs. 125 series 700A, N270KA, piloted by an airline transport pilot,… ## Docket (5 files) The files NTSB released with the investigation on June 4, 2003, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=56340. 762 KB in all. - Supplement S (item 1, .PDF, 34 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40181011&FileExtension=.PDF&FileName=Supplement%20S-Master.PDF - Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1 (item 2, .PDF, 272 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40391326&FileExtension=.PDF&FileName=Pilot%2FOperator%20Aircraft%20Accident%20Report,%20NTSB%20Form%206120.1-Redacted.PDF - Information from the Operator (item 3, .PDF, 51 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40181036&FileExtension=.PDF&FileName=Information%20from%20the%20Operator-Master.PDF - Miscellaneous - Alert Service Bulletin (item 4, .PDF, 309 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40438230&FileExtension=.PDF&FileName=Miscellaneous%20-%20Alert%20Service%20Bulletin-Redacted.PDF - Miscellaneous - Airworthiness Directive (item 5, .PDF, 97 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40181038&FileExtension=.PDF&FileName=Miscellaneous%20-%20Airworthiness%20Directive-Master.PDF From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date; 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.