# NTSB CEN15TA019: BAE Systems Hawk MK 67, N509XX, Oklahoma City, OK, October 18, 2014 - Type: NTSB accident investigation - Classification: Accident · No injuries · Final report - Date: October 18, 2014, 12:15 local (17:15 UTC) - Place: Oklahoma City, OK - Coordinates: 35.416667, -97.392776 - Nearby events: https://openairdocs.org/map.md?lat=35.4167&lon=-97.3928&mi=10 - Phase of flight: [Takeoff](https://openairdocs.org/ntsb-phases/300) (OpenAirDocs' grouping) - Defining event: [Takeoff: Runway excursion](https://openairdocs.org/ntsb-events/300) - Highest injury: No injuries - Injuries: 1 uninjured - Status: Completed, report November 30, 2015 - Report: Approved by Office Director - NTSB office: Central Region - Parties: FAA FSDO - NTSB case key (mKey): 90277 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CEN15TA019 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/90277/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=90277 - Page: https://openairdocs.org/ntsb/CEN15TA019 ## Probable cause The loss of directional control during the takeoff roll for reasons that could not be determined during postaccident examinations and testing. ## Findings NTSB's coded findings; those marked are part of the probable cause. - [Not determined](https://openairdocs.org/ntsb-findings/05000000): Not determined › Not determined · Unknown/Not determined (probable cause); cases with it: [BAE Systems HAWK MK 67, 1 case](https://openairdocs.org/ntsb-findings/05000000/cases.md?model=1500868), [All aircraft, 2,247 cases](https://openairdocs.org/ntsb-findings/05000000/cases.md) ## Sequence of events The events NTSB coded, in order, by phase of flight. The defining event best describes what happened. - [Unknown: Unknown or undetermined](https://openairdocs.org/ntsb-events/000); cases with it: [BAE Systems HAWK MK 67, 1 case](https://openairdocs.org/ntsb-events/000/sequence.md?model=1500868), [All aircraft, 1,703 cases](https://openairdocs.org/ntsb-events/000/sequence.md) - [Takeoff: Runway excursion](https://openairdocs.org/ntsb-events/300) (defining event); cases with it: [BAE Systems HAWK MK 67, 1 case](https://openairdocs.org/ntsb-events/300/sequence.md?model=1500868), [All aircraft, 3,643 cases](https://openairdocs.org/ntsb-events/300/sequence.md) ## Analysis The pilot was on a cross-country flight in a single-engine jet trainer and had stopped en route for refueling. The pilot reported that, during the takeoff roll, as the airspeed reached about 90 knots, the airplane made a hard left turn. He applied the right rudder and brake to stop the left turn; however, the airplane continued left off the runway surface and then came to rest upright. Examinations of the tires, wheel brakes, and rudder did not reveal any abnormalities. The nosewheel steering control unit was bench tested. During the test, the unit's power supply module failed; however, it was determined that a supply failure would cause a castering nosewheel rather than an uncommanded steering input. The reason for the uncommanded turn could not be determined. ## Factual narrative On October 18, 2014, about 1215 central daylight time, a BAE Hawk Mk 67 airplane, N509XX, departed off the side of the runway at the Tinker Air Force Base (KTIK), Oklahoma City, Oklahoma. The airline transport rated pilot was not injured, and the airplane sustained substantial damage. The airplane was registered to and operated by Air USA, Inc., Henderson, Nevada, under the provisions of 14 Code of Federal Regulations Part 91 as a public airplane flight. Visual meteorological conditions prevailed, and an instrument flight plan had been filed. The flight was originating at the time of the accident and was en route to Cherry Point Marine Corps Air Station, (KNKT) Cherry Point, North Carolina. The pilot landed at KTIK for a refueling stop, and the airplane was fueled to a full load of 747 gallons. The pilot reported that during the takeoff roll, as he reached about 90 knots, the airplane made a hard left turn. He applied right rudder and brake to stop the left turn; however, the airplane continued left, off the runway surface. The airplane came to rest in the grass in an upright position. Examination of the airplane revealed the airplane landing gear had collapsed, with the left landing gear strut penetrating the wing. The airplane was configured with two external fuel tanks and two CBLS-200 bomb racks. The airplane and landing gear was inspected by engineers from BAE Systems. The airplane tires, wheel brakes, and anti-skid systems were visually inspected and then disassembled. The airplane rudder system was also inspected; the inspections did not identify any abnormalities that would have accounted for the airplane's departure from the runway. The Nose Wheel Steering Digital Control Unit (DCU) was sent to the manufacturer, SAFRAN Electronics, facility in Canada for further investigation. The DCU showed no faults when run through the automated test program. During environmental testing, the unit failed 2 hours into the test at minus 40 deg C. The unit was disassembled and the fault was identified as a short in the power supply module. It was determined that the power supply failure would cause a system shut down, resulting in a castering nose wheel, rather than un-commanded steering input. Examination of the airplane did not find any abnormalities that would account for the un-commanded turn ## Aircraft - Registration: [N509XX](https://openairdocs.org/deregistered/N509XX-2022-12-31), registration cancelled 2022-12-31, S/N 67-509, built 1993 (OpenAirDocs) - Reported make and model: BAE SYSTEMS HAWK MK 67 - Registry model: [BAE Systems HAWK MK 67](https://openairdocs.org/model/bae-systems-hawk-mk-67) (registry code 1500868) (OpenAirDocs) - Registry engine: [Rolls-Turb ADOUR MK 861](https://openairdocs.org/engine/rolls-turb-adour-mk-861) (registry code 54595, turbo-fan) (OpenAirDocs) - Category: Airplane - Serial number: 67-509 - Year built: 1993 - Engines: Rolls Royce turbo fan - Damage: Substantial damage - Flight: Public aircraft - federal, Public use - Operator: Air USA Inc - Registered owner: Air USA Inc - Airworthiness certificate: Special, Experimental (Special) - Departed: KTIK, Oklahoma City, OK - Destination: Cherry Point, NC - Flight plan: IFR - Airport: KTIK, Tinker AFB, runway 36, 11,101 × 200 ft, concrete ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 73; injuries: none; airline transport; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 3, with waivers/limitations; seat: front; restraint: 4-point; flight hours: 27,100 total, 17.5 in this make and model, 19,100 as pilot in command, 22.3 in the last 90 days, 7.3 in the last 30 days ## Weather - Conditions: Visual (VMC), Day - Wind: 60° at 10 knots - Visibility: 10 statute miles - Temperature: 66 °F, dew point 46 °F - Altimeter: 30.20 inHg - Observed at: KTIK ## 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 20141018018469A](https://openairdocs.org/incident/20141018018469A), Oct 18, 2014: Bae Systems HAWK MK 67, Oklahoma City, OK, Substantial damage. Pilot was operating aircraft under contract with navairsyscom enroute from yuma AZ (nyl) to cherry point NC (nkt) with refueling stop at Tinker Afb (tik).… ## Docket (2 files) The files NTSB released with the investigation on October 30, 2015, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=90277. 2.1 MB in all. - Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1 (item 1, .PDF, 1.8 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40433344&FileExtension=.PDF&FileName=Pilot%2FOperator%20Aircraft%20Accident%20Report,%20NTSB%20Form%206120.1-Master.PDF - Photo (item 2, .PDF, 253 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40433345&FileExtension=.PDF&FileName=Photo-Master.PDF 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.