# NTSB WPR12CA145: Rockwell International 690C, N840JC, Conrad, MT, March 23, 2012 - Type: NTSB accident investigation - Classification: Accident · No injuries · Data collection · Final report - Date: March 23, 2012, 08:10 local (14:10 UTC) - Place: Conrad, MT - Coordinates: 48.168056, -111.976387 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=48.1681&lon=-111.9764&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: 5 uninjured - Status: Completed, report May 15, 2012 - Report: Approved by Office Director - NTSB office: Western Pacific Region - Parties: Helena FSDO - NTSB case key (mKey): 83205 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=WPR12CA145 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/83205/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=83205 - Page: https://openairdocs.org/ntsb/WPR12CA145 ## Probable cause The pilot did not maintain directional control of the airplane due to ice and slushy snow on the runway during the landing roll. ## Findings NTSB's coded findings; those marked are part of the probable cause. - [Performance/control parameters: directional control](https://openairdocs.org/ntsb-findings/01062020): Aircraft › Aircraft oper/perf/capability · Not attained/maintained (probable cause); cases with it: [Gulfstream AM Corp Comm Div 690C, 1 case](https://openairdocs.org/ntsb-findings/01062020/cases.md?model=3970404), [All aircraft, 3,958 cases](https://openairdocs.org/ntsb-findings/01062020/cases.md) - [Use of equip/info: aircraft control](https://openairdocs.org/ntsb-findings/02063040): Personnel issues › Task performance · Pilot (probable cause); cases with it: [Gulfstream AM Corp Comm Div 690C, 4 cases](https://openairdocs.org/ntsb-findings/02063040/cases.md?model=3970404), [All aircraft, 9,295 cases](https://openairdocs.org/ntsb-findings/02063040/cases.md) - [Runway/land/takeoff/taxi surface: snow/slush/ice covered surface](https://openairdocs.org/ntsb-findings/03023015): Environmental issues › Physical environment · Contributed to outcome; cases with it: [Gulfstream AM Corp Comm Div 690C, 1 case](https://openairdocs.org/ntsb-findings/03023015/cases.md?model=3970404), [All aircraft, 219 cases](https://openairdocs.org/ntsb-findings/03023015/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: [Gulfstream AM Corp Comm Div 690C, 1 case](https://openairdocs.org/ntsb-events/230/sequence.md?model=3970404), [All aircraft, 4,585 cases](https://openairdocs.org/ntsb-events/230/sequence.md) - [Landing-landing roll: Runway excursion](https://openairdocs.org/ntsb-events/300); cases with it: [Gulfstream AM Corp Comm Div 690C, 1 case](https://openairdocs.org/ntsb-events/300/sequence.md?model=3970404), [All aircraft, 3,643 cases](https://openairdocs.org/ntsb-events/300/sequence.md) - [Landing-landing roll: Collision with terr/obj (non-CFIT) ](https://openairdocs.org/ntsb-events/470); cases with it: [Gulfstream AM Corp Comm Div 690C, 3 cases](https://openairdocs.org/ntsb-events/470/sequence.md?model=3970404), [All aircraft, 10,189 cases](https://openairdocs.org/ntsb-events/470/sequence.md) ## Analysis The pilot, who was executing a global positioning system approach to a non-controlled airport, saw a snowplow clearing snow from the runway as he broke out of the overcast in a light snow shower. Soon after the pilot spotted the snowplow, it exited the runway, and the pilot continued his approach/landing sequence. After touchdown, the airplane encountered an area of ice and slush on the runway and began to slide. The pilot stated that he should have initiated a go-around, but the airplane was never sufficiently realigned with the runway so he could safely apply go-around power. As the pilot continued his efforts to realign the airplane with the runway, the airplane departed the side of the runway and impacted a natural gas line warning sign. The impact with the sign resulted in a tear in the stressed skin of the fuselage that exceeded eight inches in length. The pilot did not report any mechanical malfunction during the accident sequence. ## Factual narrative The pilot, who was executing a Global Positioning System approach to a non-controlled airport with an unmonitored Common Traffic Advisory Frequency, saw a snowplow clearing snow from the runway as he broke out of the overcast in a light snow shower. Soon after the pilot spotted the snowplow, it exited the runway, and he continued his approach/landing sequence. After touchdown, the airplane began to slide when it encountered an area of ice and slush that still remained on the runway surface. Although the pilot decided he should initiate a go-around, he was never sufficiently realigned with the runway to feel that he could safely apply go-around power. As the pilot continued his efforts to realign the airplane, it departed the side of the runway, and prior to coming to a stop it impacted a natural gas line warning sign. The impact with the sign resulted in a tear in the stressed skin of the fuselage that exceeded eight inches in length. The pilot did not report any mechanical malfunction associated with the accident sequence. ## Aircraft - Registration: [N840JC](https://openairdocs.org/deregistered/N840JC-2019-03-26), registration cancelled 2019-03-26, S/N 11676, built 1981 (OpenAirDocs) - Reported make and model: ROCKWELL INTERNATIONAL 690C - Registry model: [Gulfstream AM Corp Comm Div 690C](https://openairdocs.org/model/gulfstream-am-corp-comm-div-690c) (registry code 3970404) (OpenAirDocs) - Registry engine: [AiResearch TPE331-5-252M](https://openairdocs.org/engine/airesearch-tpe331-5-252m) (registry code 01522, turbo-prop) (OpenAirDocs) - Category: Airplane - Serial number: 11643 - Airframe hours: 8830 - Engines: turbo prop; Garret TPE 331-10T 715 horsepower turbo prop - Damage: Substantial damage - Flight: Other work use, Part 91 - Operator: Kalispell Regiional Medical Center - Registered owner: Eagle II LLC - Airworthiness certificate: Standard, Normal - Last inspection: January 20, 2012 - Departed: KGPI, Kalispell, MT - Destination: S01, Conrad, MT - Flight plan: IFR - Airport: S01, Conrad Airport, runway 24, 4,601 × 75 ft, asphalt ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 54; injuries: none; airline transport; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane; medical: class 2, with waivers/limitations; seat: left; flight hours: 4,900 total, 400 in this make and model ## Weather - Conditions: Instrument (IMC), Day - Wind: 350° at 4 knots - Visibility: 2 statute miles - Lowest ceiling: 1,500 ft broken ## 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 20120323004189A](https://openairdocs.org/incident/20120323004189A), Mar 23, 2012: Rockwell International 690C, Conrad, MT, Substantial damage. March 23, 2012SYNOPSIS of landing incident with N840JC by [privacy data omitted]on the morning of March 23, 2012 I prepared for a flight from kalispell,… ## Other investigations on N840JC (1) 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. - [NTSB ERA19LA043](https://openairdocs.org/ntsb/ERA19LA043), Nov 12, 2018: Aero Commander 690 (N840JC), Myrtle Beach, SC, substantial damage. Probable cause: An encounter with low-level windshear and turbulence during the landing approach, which resulted in a loss of airplane control. ## Docket (1 files) The files NTSB released with the investigation on April 13, 2012, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=83205. 674 KB in all. - Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1 (item 1, .PDF, 674 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40365885&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.