# NTSB WPR12CA101: Learjet 31A, N382AL, Wheatland, WY, February 11, 2012 - Type: NTSB accident investigation - Classification: Accident · No injuries · Data collection · Final report - Date: February 11, 2012, 12:00 local (19:00 UTC) - Place: Wheatland, WY - Coordinates: 42.050834, -104.918609 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=42.0508&lon=-104.9186&mi=10 - Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping) - Defining event: [Landing-landing roll: Loss of control on ground](https://openairdocs.org/ntsb-events/230) - Highest injury: No injuries - Injuries: 4 uninjured - Status: Completed, report April 2, 2012 - Report: Approved by Office Director - NTSB office: Western Pacific Region - Parties: Federal Aviation Administration - NTSB case key (mKey): 82868 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=WPR12CA101 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/82868/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=82868 - Page: https://openairdocs.org/ntsb/WPR12CA101 ## Probable cause The flight crew’s loss of directional control during landing on an ice- and water-contaminated runway, which resulted in a runway excursion. ## Findings NTSB's coded findings; those marked are part of the probable cause. - [Use of equip/info: aircraft control](https://openairdocs.org/ntsb-findings/02063040): Personnel issues › Task performance · Pilot (probable cause); cases with it: [All aircraft, 9,295 cases](https://openairdocs.org/ntsb-findings/02063040/cases.md) - [Performance/control parameters: directional control](https://openairdocs.org/ntsb-findings/01062020): Aircraft › Aircraft oper/perf/capability · Not attained/maintained (probable cause); cases with it: [All aircraft, 3,958 cases](https://openairdocs.org/ntsb-findings/01062020/cases.md) - [Runway/land/takeoff/taxi surface: snow/slush/ice covered surface](https://openairdocs.org/ntsb-findings/03023015): Environmental issues › Physical environment · Effect on operation (probable cause); cases with it: [All aircraft, 219 cases](https://openairdocs.org/ntsb-findings/03023015/cases.md) - [Runway/land/takeoff/taxi surface: wet surface](https://openairdocs.org/ntsb-findings/03023010): Environmental issues › Physical environment · Effect on operation (probable cause); cases with it: [All aircraft, 141 cases](https://openairdocs.org/ntsb-findings/03023010/cases.md) ## Sequence of events The events NTSB coded, in order, by phase of flight. The defining event best describes what happened. - [Landing-landing roll: Loss of control on ground](https://openairdocs.org/ntsb-events/230) (defining event); cases with it: [All aircraft, 4,585 cases](https://openairdocs.org/ntsb-events/230/sequence.md) - [Landing-landing roll: Landing gear collapse](https://openairdocs.org/ntsb-events/094); cases with it: [All aircraft, 1,787 cases](https://openairdocs.org/ntsb-events/094/sequence.md) ## Analysis The operator reported that, as the airplane neared the destination airport, the flight crew prepared for landing. The runway appeared to have been plowed earlier in the day and was wet with a few patches of snow and ice. After a normal touchdown, the flight crew deployed the thrust reversers and applied brakes in an effort to gradually decelerate. The airplane began to veer to the right side of the runway and would not respond to the pilots' control inputs. The airplane continued off the runway surface traveling about 70 knots. The main landing gear collapsed and punctured the wings. The airplane incurred substantial damage to the right wing. The operator reported that there were no mechanical malfunctions or failures with the airplane that would have precluded normal operation. ## Factual narrative The operator reported that as the airplane entered the vicinity of the destination airport, the pilots prepared for landing. The runway appeared to have been plowed earlier in the day and was wet with a few patches of snow and ice. After a normal touchdown, the pilots deployed the thrust reversers and applied brakes in an effort to gradually decelerate. The airplane began to veer to the right side of the runway and would not respond to the pilots' control inputs. The airplane continued off the runway surface traveling about 70 knots. The main landing gear collapsed and punctured the wings. The airplane incurred major damage to the right wing. The operator reported there were no mechanical malfunctions or failures with the airplane that would have precluded normal operation. ## Aircraft - Registration: N382AL (not matched to a registry record) - Reported make and model: LEARJET INC 31A - Category: Airplane - Serial number: 192 - Engines: Garrett TFE731-2-3B 3500 lbs thrust turbo fan; turbo fan - Damage: Substantial damage - Flight: Part 135 - Operator: International Jet Services, Inc. - Registered owner: Mm Air Inc - Airworthiness certificate: Standard, Transport - Departed: APA, Centennial, CO - Destination: EAN, Wheatland, WY - Flight plan: IFR - Airport: EAN, Phifer Airfield, runway 08, 5,900 × 75 ft, asphalt ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 65; injuries: none; airline transport; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane; medical: class 1, with waivers/limitations; flight hours: 12,541 total, 384 in this make and model - Co-pilot; age 45; airline transport; airplane ratings: multi-engine land, single-engine land, single-engine sea; medical: class 1, without waivers/limitations; flight hours: 5,501 total, 6 in this make and model ## Weather - Conditions: Visual (VMC), Day - Wind: 110° at 11 knots - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 12 °F, dew point 9 °F - Altimeter: 30.55 inHg ## 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 20120211002109A](https://openairdocs.org/incident/20120211002109A), Feb 11, 2012: Learjet Inc 31A, Wheatland, WY, Substantial damage. On 02/11/2012 at approximately 1200 MST, N382AL, a Learjet model 31A aircraft sustained substantial damage during rollout on runway 8 at Wheatland, (kean)… ## Docket (1 files) The files NTSB released with the investigation on March 2, 2012, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=82868. 1.2 MB in all. - Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1 (item 1, .PDF, 1.2 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40363946&FileExtension=.PDF&FileName=Pilot%2FOperator%20Aircraft%20Accident%20Report,%20NTSB%20Form%206120.1-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.