# NTSB WPR12CA112: Rockwell International S-2R, N8433V, Yellow Pine, ID, February 14, 2012 - Type: NTSB accident investigation - Classification: Accident · No injuries · Data collection · Final report - Date: February 14, 2012, 12:30 local (19:30 UTC) - Place: Yellow Pine, ID - Coordinates: 44.899723, -115.332778 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=44.8997&lon=-115.3328&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: 1 uninjured - Status: Completed, report April 24, 2012 - Report: Approved by Office Director - NTSB office: Western Pacific Region - Parties: Federal Aviation Administration - NTSB case key (mKey): 82947 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=WPR12CA112 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/82947/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=82947 - Page: https://openairdocs.org/ntsb/WPR12CA112 ## Probable cause The pilot did not maintain directional control while landing on a snow-contaminated runway. ## 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: [Rockwell International S-2R, 6 cases](https://openairdocs.org/ntsb-findings/01062020/cases.md?model=7630202), [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: [Rockwell International S-2R, 7 cases](https://openairdocs.org/ntsb-findings/02063040/cases.md?model=7630202), [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 · Effect on operation; cases with it: [Rockwell International S-2R, 1 case](https://openairdocs.org/ntsb-findings/03023015/cases.md?model=7630202), [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: [Rockwell International S-2R, 8 cases](https://openairdocs.org/ntsb-events/230/sequence.md?model=7630202), [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: [Rockwell International S-2R, 2 cases](https://openairdocs.org/ntsb-events/094/sequence.md?model=7630202), [All aircraft, 1,787 cases](https://openairdocs.org/ntsb-events/094/sequence.md) - [Landing-landing roll: Collision with terr/obj (non-CFIT) ](https://openairdocs.org/ntsb-events/470); cases with it: [Rockwell International S-2R, 20 cases](https://openairdocs.org/ntsb-events/470/sequence.md?model=7630202), [All aircraft, 10,189 cases](https://openairdocs.org/ntsb-events/470/sequence.md) ## Analysis The pilot reported that he made a normal touchdown in the tailwheel-equipped airplane onto the centerline of the snow packed runway. He said that about halfway down the runway, he applied reverse thrust in an effort to slow the airplane. Shortly after entering reverse, the airplane veered about 5 degrees to the right. The pilot applied left brake and rudder to correct the turn; however, the airplane continued to the right due to the limited braking action on the runway surface. About three-quarters of the way down the runway, the airplane struck an ice chunk and the right main landing gear collapsed. The airplane’s right wing was substantially damaged. The pilot reported no mechanical failures or malfunctions that would have precluded normal operations. ## Factual narrative The pilot reported that he made a normal touchdown in the tailwheel equipped airplane onto the centerline of the snow packed runway. Approximately halfway down the runway, the pilot reversed thrust in an effort to slow the airplane down. Shortly after entering reverse, the airplane veered approximately 5 degrees to the right. The pilot applied left brake and rudder to correct the turn; however, there was limited braking action on the runway surface and the airplane continued to the right. About three quarters down the runway, the airplane struck an ice chunk and the right main landing gear collapsed. The airplane’s right wing was substantially damaged. The pilot reported no mechanical failures or malfunctions that would have precluded normal operations. ## Aircraft - Registration: [N8433V](https://openairdocs.org/aircraft/N8433V), registered now, S/N 2193R (OpenAirDocs) - Reported make and model: ROCKWELL INTERNATIONAL S-2R - Registry model: [Rockwell International S-2R](https://openairdocs.org/model/rockwell-international-s-2r) (registry code 7630202) (OpenAirDocs) - Registry engine: [Amateur-built UNKNOWN ENG](https://openairdocs.org/engine/amateur-built-unknown-eng) (registry code 99999) (OpenAirDocs) - Category: Airplane - Serial number: 2193R - Airframe hours: 13075 - Engines: HONEYWELL TPE 331-10 900 horsepower turbo prop - Damage: Substantial damage - Flight: Other work use, Part 137 - Operator: Valley Air LLC - Registered owner: Valley Air Service Inc - Airworthiness certificate: Special, Restricted (Special) - Last inspection: Annual, May 11, 2011 - Departed: ID41, Yellow Pine, ID - Destination: ID41, Yellow Pine, ID - Airport: ID41, Stibnite Airport, runway 24, 2,450 × 175 ft, snow ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 36; injuries: none; commercial; airplane ratings: single-engine land; instrument ratings: airplane; medical: class 2, without waivers/limitations; last flight review November 5, 2011; seat: center; flight hours: 4,736 total, 1,525 in this make and model, 4,680 as pilot in command, 24 in the last 90 days, 24 in the last 30 days, 18 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: calm - Visibility: 10 statute miles - Lowest ceiling: 4,200 ft broken - Temperature: 30 °F, dew point 12 °F - Altimeter: 29.79 inHg - Observed at: MYL, 32 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). - [Incident 20120214002029I](https://openairdocs.org/incident/20120214002029I), Feb 14, 2012: Rockwell International S-2R, Yellow Pine, ID, Minor damage. The pilot touched down normally and was lined up with the center line of the runway. The pilot put the engine in reverse to slow the aircraft down, the… ## Docket (1 files) The files NTSB released with the investigation on March 23, 2012, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=82947. 1.3 MB in all. - Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1 (item 1, .PDF, 1.3 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40364526&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.