# NTSB WPR10CA225: Ayres S2R-T34, N6018T, Yuba City, CA, May 3, 2010 - Type: NTSB accident investigation - Classification: Accident · No injuries · Data collection · Final report - Date: May 3, 2010, 16:00 local (23:00 UTC) - Place: Yuba City, CA - Coordinates: 39.095554, -121.716392 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=39.0956&lon=-121.7164&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 July 22, 2010 - Report: Approved by Office Director - NTSB office: Western Pacific Region - Parties: FAA Sacramento FSDO - NTSB case key (mKey): 75930 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=WPR10CA225 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/75930/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=75930 - Page: https://openairdocs.org/ntsb/WPR10CA225 ## Probable cause The pilot's failure to maintain directional control 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: [Ayres S2R-T34, 1 case](https://openairdocs.org/ntsb-findings/01062020/cases.md?model=0970106), [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: [Ayres S2R-T34, 5 cases](https://openairdocs.org/ntsb-findings/02063040/cases.md?model=0970106), [All aircraft, 9,295 cases](https://openairdocs.org/ntsb-findings/02063040/cases.md) - [Wind: tailwind](https://openairdocs.org/ntsb-findings/03034015): Environmental issues › Conditions/weather/phenomena · Effect on operation; cases with it: [Ayres S2R-T34, 1 case](https://openairdocs.org/ntsb-findings/03034015/cases.md?model=0970106), [All aircraft, 594 cases](https://openairdocs.org/ntsb-findings/03034015/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: [Ayres S2R-T34, 3 cases](https://openairdocs.org/ntsb-events/230/sequence.md?model=0970106), [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: [Ayres S2R-T34, 2 cases](https://openairdocs.org/ntsb-events/300/sequence.md?model=0970106), [All aircraft, 3,643 cases](https://openairdocs.org/ntsb-events/300/sequence.md) ## Analysis The pilot stated that during departure for an aerial application flight the gearbox chip detector light illuminated approximately five miles from the runway. The pilot elected to reverse course and return to the airport. The airplane landed with a reported tailwind on runway 34. According to the pilot, during the landing roll the nose of the airplane made a sharp left turn as beta and braking were initiated. The airplane skidded and exited the left side of the runway into a field and impacted a berm. The airplane sustained substantial damage to the wings. Shortly after the accident the operator stated that the pilot landed with a tailwind. The pilot subsequently reported winds of 300 degrees at 12 knots. The closest weather reporting station is located 7 miles east at Marysville. The reported winds at Marysville at the time of the accident were 140 degrees at 14 knots gusting to 17 knots. The operator also stated that there were no known mechanical failures and that there were parallel and equal skid marks left on the runway by the airplane as it decelerated. ## Factual narrative The pilot stated that during departure for an agricultural application flight the gearbox chip detector light illuminated approximately five miles from the runway. The pilot elected to reverse course and return to the airport. The airplane landed with a reported tailwind on runway 34. According to the pilot, during the landing roll the nose of the airplane made a sharp left turn as beta and braking were initiated. The airplane skidded and exited the left side of the runway into a field and impacted a berm. The airplane sustained substantial damage to the wings. Shortly after the accident the operator stated that the pilot landed with a tailwind. The pilot subsequently reported winds of 300 degrees at 12 knots. The closest weather reporting station is located 7 miles east at Marysville. The reported winds at Marysville at the time of the accident were 140 degrees at 14 knots gusting to 17 knots. The operator also stated that there were no known mechanical failures and that there were parallel and equal skid marks left on the runway by the airplane as it decelerated. ## Aircraft - Registration: [N6018T](https://openairdocs.org/aircraft/N6018T), registered now, S/N T41-192 (OpenAirDocs) - Reported make and model: AYRES CORPORATION S2R-T34 - Registry model: [Ayres S2R-T34](https://openairdocs.org/model/ayres-s2r-t34) (registry code 0970106) (OpenAirDocs) - Category: Airplane - Serial number: T41-192 - Airframe hours: 6734 - Engines: Pratt & Whitney Canada PT6 850 horsepower turbo prop - Damage: Substantial damage - Flight: Aerial application, Part 137 - Operator: South Delta Aviation Inc - Registered owner: South Delta Aviation Inc - Airworthiness certificate: Special, Restricted (Special) - Last inspection: 100 hour, April 23, 2010 - Departed: CA73, Yuba City, CA - Destination: CA73, Yuba City, CA - Flight plan: Company VFR - Airport: CA73, Vanderford Ranch CO Airport, runway 34, 3,220 × 48 ft, asphalt ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 65; injuries: none; commercial; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 2, with waivers/limitations; last flight review April 1, 2009; seat: single; flight hours: 33,500 total, 9,200 in this make and model, 30 in the last 90 days, 20 in the last 30 days, 10 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 300° at 12 knots, gusting 15 - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 84 °F, dew point 50 °F - Altimeter: 30.05 inHg - Observed at: KMYV, 7 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). - [Accident 20100503033859A](https://openairdocs.org/incident/20100503033859A), May 3, 2010: Ayres Corpo S2R-T34, Yuba City, CA, Substantial damage. 10 Minutes after pilot took off on his way to spray a field, he had a chip light. Pilot hurried back to airport and and landed. During roll out aircraft made a… ## Docket (2 files) The files NTSB released with the investigation on June 7, 2010, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=75930. 348 KB in all. - Record of Telephone Call (item 1, .PDF, 27 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40330299&FileExtension=.PDF&FileName=Record%20of%20Telephone%20Call-Redacted.PDF - Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1 (item 2, .PDF, 322 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40330922&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.