# NTSB WPR10IA256: Bombardier CL-600-2B19, N925SW, Ontario, CA, May 23, 2010 - Type: NTSB incident investigation - Classification: Incident · No injuries · Incident investigation · Final report - Date: May 23, 2010, 10:20 local (17:20 UTC) - Place: Ontario, CA - Coordinates: 34.055831, -117.601112 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=34.0558&lon=-117.6011&mi=10 - Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping) - Defining event: [Landing: Sys/Comp malf/fail (non-power)](https://openairdocs.org/ntsb-events/330) - Highest injury: No injuries - Injuries: 27 uninjured - Status: Completed, report August 7, 2012 - Report: Approved by Office Director - NTSB office: Western Pacific Region - Parties: Federal Aviation Administration, FAA- SkyWest CMO, SkyWest Airlines, Transportation Safety Board of Canada (TSB) - NTSB case key (mKey): 76081 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=WPR10IA256 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/76081/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=76081 - Page: https://openairdocs.org/ntsb/WPR10IA256 ## Probable cause Failure of the airplane’s nose landing gear to extend for undetermined reasons. ## Findings NTSB's coded findings; those marked are part of the probable cause. - [Landing gear system: nose/tail landing gear](https://openairdocs.org/ntsb-findings/01023220): Aircraft › Aircraft systems · Malfunction (probable cause); cases with it: [Bombardier CL-600-2B19, 1 case](https://openairdocs.org/ntsb-findings/01023220/cases.md?model=1390008), [All aircraft, 185 cases](https://openairdocs.org/ntsb-findings/01023220/cases.md) - [Not determined](https://openairdocs.org/ntsb-findings/05000000): Not determined › Not determined · Unknown/Not determined (probable cause); cases with it: [Bombardier CL-600-2B19, 1 case](https://openairdocs.org/ntsb-findings/05000000/cases.md?model=1390008), [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. - [Landing: Sys/Comp malf/fail (non-power)](https://openairdocs.org/ntsb-events/330) (defining event); cases with it: [Bombardier CL-600-2B19, 4 cases](https://openairdocs.org/ntsb-events/330/sequence.md?model=1390008), [All aircraft, 994 cases](https://openairdocs.org/ntsb-events/330/sequence.md) - [Landing: Landing gear not configured](https://openairdocs.org/ntsb-events/095); cases with it: [Bombardier CL-600-2B19, 4 cases](https://openairdocs.org/ntsb-events/095/sequence.md?model=1390008), [All aircraft, 584 cases](https://openairdocs.org/ntsb-events/095/sequence.md) ## Analysis After the pilots extended the airplane’s landing gear in preparation for landing, they observed an unsafe nose landing gear indication and performed a go-around to try to correct the situation. The pilots followed the emergency procedures in the operator’s Quick Reference Handbook but were unable to lower the nose landing gear. The pilots then performed a low-level flyby so air traffic control tower (ATCT) and ground personnel could evaluate the condition of the nose landing gear. When ATCT and ground personnel confirmed that the landing gear doors were open and the nose landing gear remained retracted, the pilots decided to make an emergency landing with the nose landing gear retracted. After the main landing gear touched down, the captain held the nose off the ground as long as possible, in accordance with company procedures. The airplane slid about 2,000 feet after the nose settled to the runway before coming to a stop. During the recovery process, the nose landing gear was extended. Postaccident examination revealed no abnormalities that would have precluded normal operation of the nose landing gear system. ## Factual narrative On May 23, 2010, about 1020 Pacific daylight time (PDT), Skywest Airlines flight 6467, a Bombardier CRJ, CL-600-2B19, N925SW, made an emergency landing with the nose gear in the retracted position at Ontario International Airport (ONT), Ontario, California. Skywest Airlines, Inc., was operating the airplane as a scheduled domestic passenger flight under the provisions of 14 Code of Federal Regulations (CFR) Part 121. The certificated airline transport pilot captain, commercial pilot first officer, flight attendant, and 24 passengers were not injured. The flight departed San Francisco International Airport (SFO), San Francisco, California, about 0815 as a non-stop to Ontario. Visual meteorological (VMC) conditions prevailed, and an instrument flight rules (IFR) flight plan had been filed. The crew reported that the flight was uneventful until they were on final approach for landing at ONT. The landing gear selector was moved to the down position. The main landing gear extended and locked into place; however, the nose landing gear remained retracted. The crew observed an unsafe nose landing gear indication. The crew aborted the landing approach, and advised air traffic control (ATC) of the emergency. The crew attempted to correct the landing gear malfunction by following the emergency procedures utilizing the Quick Reference Handbook (QRH), but was unsuccessful. The crew conducted a low-level flyby to have tower and ground personnel evaluate the condition of the nose landing gear. The landing gear doors were open, but the nose landing gear was still retracted in the landing gear compartment. Due to the unsuccessful attempt to lower the nose landing gear, the crew decided to make an emergency landing. After the main landing gear touched down, the captain held the nose off the ground as long as possible. The nose landing gear doors touched down on the runway centerline, and the airplane slid about 2,000 feet. The passengers and crew exited the airplane using the main cabin door. The airplane's Cockpit Voice Recorder (CVR), and the Flight Data Recorder (FDR) were removed and shipped to the NTSB CVR/FDR lab in Washington, DC, for download and read out. A factual report for the CVR and the FDR are attached to the docket. After the airplane was jacked up using airbags and the nose gear extended, an examination of the damage to the belly of the airplane was determined to be minor. The airplane was towed to a fixed base operator-(FBO) to prepare the airplane for a ferry flight to one of the operator’s maintenance facilities. On May 26, 2010, the airplane was flown from ONT to Fresno, California, on a ferry permit. On May 27 and 28, 2010, investigators examined the airplane's landing gear systems. The nose landing gear was removed from the airframe and shipped to the manufacturer for further examination. A copy of the inspection with the observations and findings are attached to the docket. Investigators convened at the Messier-Dowty, the manufacturer ofthe nose landing gear on August 1, 2010. An examination of the landing gear was accomplished and a copy of the report is attached to the docket. Hydraulic samples were taken from the (3) nose gear landing servos and submitted for analysis. All results appeared normal, except for the sample from the Uplock Actuator servo, which revealed “PARTICLES APPEAR ABNORMAL AT NAS CLASS 12, NAS CLASS 9 OR BETTER IS RECOMMENDED” All other tests appear normal. After all examinations, the investigation found no abnormalities that would have precluded normal operations of the landing gear system. ## Aircraft - Registration: [N925SW](https://openairdocs.org/aircraft/N925SW), registered now, S/N 7682, built 2002 (OpenAirDocs) - Reported make and model: BOMBARDIER INC CL-600-2B19 - Registry model: [Bombardier CL-600-2B19](https://openairdocs.org/model/bombardier-cl-600-2b19) (registry code 1390008) (OpenAirDocs) - Registry engine: [GE CF34 series](https://openairdocs.org/engine/ge-cf34-series) (registry code 30015, turbo-fan) (OpenAirDocs) - Category: Airplane - Serial number: 7682 - Airframe hours: 20292 - Engines: GE CF34 SERIES 9140 lbs thrust turbo fan; GE CF34 SERIES 9140 lbs thrust turbo fan - Damage: Minor damage - Flight: Part 121 - Operator: Skywest Airlines Inc - Registered owner: Wells Fargo Bank Northwest Na Trustee - Airworthiness certificate: Standard, Transport - Last inspection: Continuous airworthiness, May 20, 2010 - Departed: SFO, San Francisco, CA - Destination: ONT, Ontario, CA - Flight plan: IFR - Airport: ONT, Ontario International Airport, runway 26L, 10,200 × 150 ft, concrete ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 52; injuries: none; airline transport, flight instructor; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 1, with waivers/limitations; seat: left; flight hours: 13,891 total, 6,502 in this make and model, 11,970 as pilot in command, 144 in the last 90 days, 57 in the last 30 days, 3 in the last 24 hours - Co-pilot; injuries: none; commercial; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane; medical: class 1, without waivers/limitations; seat: right; flight hours: 4,800 total, 2,030 in this make and model, 1,200 as pilot in command, 211 in the last 90 days, 58 in the last 30 days, 3 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 250° at 9 knots, gusting 15 - Visibility: 10 statute miles - Lowest ceiling: 3,900 ft broken - Temperature: 57 °F, dew point 39 °F - Altimeter: 29.82 inHg - Observed at: ONT ## 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 20100523034759I](https://openairdocs.org/incident/20100523034759I), May 23, 2010: Bombardier CL-600-2B19, Ontario, CA, Minor damage. On approach to Ontario International Airport (ont) skywest airlines flight 6467 was unable to extend the nose landing gear, subsequently making a successful… ## Docket (11 files) The files NTSB released with the investigation on June 15, 2012, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=76081. 5.3 MB in all. - Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1 (item 1, .PDF, 887 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40369089&FileExtension=.PDF&FileName=Pilot%2FOperator%20Aircraft%20Accident%20Report,%20NTSB%20Form%206120.1-Redacted.PDF - Addendum to 6120 Pilot & FO Flight Times (item 2, .PDF, 184 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40369095&FileExtension=.PDF&FileName=Addendum%20to%206120%20Pilot%20%26%20FO%20Flight%20Times-Master.PDF - Flight Data Recorder 10 - Specialist's Factual Report (item 3, .PDF, 2.2 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40335853&FileExtension=.PDF&FileName=Flight%20Data%20Recorder%2010%20-%20Specialist%27s%20Factual%20Report-Master.PDF - Flight Data Recorder 10 - Attachment 1 - Tabular Data - Flight - (CSV Format - Compressed File (Zip)) (item 4, ZIP, 1.4 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40335854&FileExtension=zip&FileName=Flight%20Data%20Recorder%2010%20-%20Attachment%201%20-%20Tabular%20Data%20-%20Flight%20-%20(CSV%20Format%20-%20Compressed%20File%20(Zip))-Master - Cockpit Voice Recorder 12 - Specialist's Factual Report (item 5, .PDF, 91 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40369502&FileExtension=.PDF&FileName=Cockpit%20Voice%20Recorder%2012%20-%20Specialist%27s%20Factual%20Report-Master.PDF - Crew Statements (item 6, .PDF, 78 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40369090&FileExtension=.PDF&FileName=Crew%20Statements-Master.PDF - Bombardier Examination Report (item 7, .PDF, 31 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40369091&FileExtension=.PDF&FileName=Bombardier%20Examination%20Report-Master.PDF - Hydraulic Fuild Test Results (item 8, .PDF, 145 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40369094&FileExtension=.PDF&FileName=Hydraulic%20Fuild%20Test%20Results-Redacted.PDF - TSB Canada Accredited Representative (item 9, .PDF, 120 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40370466&FileExtension=.PDF&FileName=TSB%20Canada%20Accredited%20Representative-Redacted.PDF - Statement of Party Representatives to NTSB Investigation (item 10, .PDF, 68 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40369098&FileExtension=.PDF&FileName=Statement%20of%20Party%20Representatives%20to%20NTSB%20Investigation-Redacted.PDF - Release of Aircraft Wreckage, NTSB Form 6120.15 (item 11, .PDF, 148 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40369099&FileExtension=.PDF&FileName=Release%20of%20Aircraft%20Wreckage,%20NTSB%20Form%206120.15-Redacted.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.