# NTSB CEN13LA414: Ayres S2R-T41, N2239B, Coy, AR, July 10, 2013 - Type: NTSB accident investigation - Classification: Accident · Minor injuries · Limited investigation · Final report - Date: July 10, 2013, 14:30 local (19:30 UTC) - Place: Coy, AR - Coordinates: 34.526943, -91.872497 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=34.5269&lon=-91.8725&mi=10 - Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping) - Defining event: [Landing-flare/touchdown: Hard landing](https://openairdocs.org/ntsb-events/092) - Highest injury: Minor injuries - Injuries: 1 minor - Status: Completed, report March 13, 2014 - Report: Approved by Office Director - NTSB office: Central Region - Parties: FAA Flight Standards District Office - NTSB case key (mKey): 87486 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CEN13LA414 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/87486/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=87486 - Page: https://openairdocs.org/ntsb/CEN13LA414 ## Probable cause The propeller’s uncommanded reverse thrust during the landing flare due to improper rigging of the propeller’s governor linkage. ## Findings NTSB's coded findings; those marked are part of the probable cause. - [Propeller system: propeller governor](https://openairdocs.org/ntsb-findings/01046122): Aircraft › Aircraft propeller/rotor · Incorrect service/maintenance (probable cause); cases with it: [Ayres S2R-T34, 1 case](https://openairdocs.org/ntsb-findings/01046122/cases.md?model=0970106), [All aircraft, 16 cases](https://openairdocs.org/ntsb-findings/01046122/cases.md) - [Aircraft](https://openairdocs.org/ntsb-findings/01060000): Aircraft › Aircraft oper/perf/capability · Attain/maintain not possible; cases with it: [Ayres S2R-T34, 1 case](https://openairdocs.org/ntsb-findings/01060000/cases.md?model=0970106), [All aircraft, 63 cases](https://openairdocs.org/ntsb-findings/01060000/cases.md) ## Sequence of events The events NTSB coded, in order, by phase of flight. The defining event best describes what happened. - [Landing-flare/touchdown: Loss of engine power (partial)](https://openairdocs.org/ntsb-events/342); cases with it: [Ayres S2R-T34, 1 case](https://openairdocs.org/ntsb-events/342/sequence.md?model=0970106), [All aircraft, 1,858 cases](https://openairdocs.org/ntsb-events/342/sequence.md) - [Landing-flare/touchdown: Hard landing](https://openairdocs.org/ntsb-events/092) (defining event); cases with it: [Ayres S2R-T34, 1 case](https://openairdocs.org/ntsb-events/092/sequence.md?model=0970106), [All aircraft, 2,102 cases](https://openairdocs.org/ntsb-events/092/sequence.md) - [Landing-landing roll: Loss of control on ground](https://openairdocs.org/ntsb-events/230); 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) ## Analysis The pilot was conducting a maintenance flight to troubleshoot the airplane's spray system in preparation for the coming agricultural season. During the landing flare, the airplane's propeller went into reverse thrust and the airplane settled to the grass runway and landed hard. The airplane bounced during the landing, departed the runway, and the left wing hit a stationary tank. The airplane continued across two ditches and came to rest on its nose. A postaccident examination of the airplane revealed that the left wing spar was bent. An examination of the engine, propeller, and related systems revealed that the linkage to the propeller governor had not been rigged properly; the investigation found no anomalies with the remaining engine and airplane systems. ## Factual narrative On July 10, 2013, about 1430 central daylight time, an Ayres Corporation S2R-T41 airplane, N2239B, was substantially damaged while landing near Coy, Arkansas. The commercial pilot was not injured. The airplane was registered to and operated by Bells Ag Service Inc., under the provisions of 14 Code of Federal Regulations Part 91 as maintenance flight. Visual meteorological conditions prevailed for the flight, which operated without a flight plan. The local flight originated approximately 1420. During the maintenance flight, the pilot was troubleshooting the spray system on the airplane in order to prepare the airplane for the coming agricultural season. During the landing flare, the airplane's propeller went into reverse thrust and the airplane settled to the grass runway and landed hard. The airplane bounced during the landing, departed the runway environment, and hit a stationary tank with the left wing. The airplane continued across two ditches and came to rest on its nose. A postaccident examination of the airplane revealed that the left wing spar was bent. An examination of the engine, propeller, and related systems revealed that the linkage to the propeller governor had not been rigged properly. An examination of the remaining engine and airplane systems revealed no anomalies. ## Aircraft - Registration: [N2239B](https://openairdocs.org/aircraft/N2239B), registered now, S/N T41-217 (OpenAirDocs) - Reported make and model: AYRES CORPORATION S2R-T41 - Registry model: [Ayres S2R-T34](https://openairdocs.org/model/ayres-s2r-t34) (registry code 0970106) (OpenAirDocs) - Registry engine: [Pratt & Whitney PT6A series](https://openairdocs.org/engine/pratt-whitney-pt6a-series) (registry code 52032, turbo-prop) (OpenAirDocs) - Category: Airplane - Serial number: T41-217 - Airframe hours: 6000 - Engines: P&W PT6A SER 750 horsepower turbo prop - Damage: Substantial damage - Flight: Flight test, Part 91 - Operator: Bells Ag Service Inc - Registered owner: Bells Ag Service Inc - Airworthiness certificate: Special, Restricted (Special) - Departed: NA, Coy, AR - Destination: NA, Coy, AR - Airport: NA, Private, runway 30, 3,000 × 50 ft, grass/turf ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 58; injuries: minor; commercial; airplane ratings: single-engine land; medical: class 2, with waivers/limitations; seat: single; restraint: 4-point; flight hours: 3,100 total, 342 in this make and model, 3,100 as pilot in command, 180 in the last 90 days ## Weather - Conditions: Visual (VMC), Day - Wind: 240° at 8 knots - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 99 °F, dew point 73 °F - Altimeter: 29.98 inHg - Observed at: KSGT, 15 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 20130710012459A](https://openairdocs.org/incident/20130710012459A), Jul 10, 2013: Ayres Corporation S2R-T34, Coy, AR, Substantial damage. On July 10, 2013 at approximately 2:30PM a 1996 Ayres Corporation, model S2R-T34 was performing a post maintenance test flight in conjunction with a nozzle… ## Docket (2 files) The files NTSB released with the investigation on December 12, 2013, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=87486. 402 KB in all. - Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1 (item 1, .PDF, 351 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40406143&FileExtension=.PDF&FileName=Pilot%2FOperator%20Aircraft%20Accident%20Report,%20NTSB%20Form%206120.1-Redacted.PDF - FAA Inspector Statement (item 2, .PDF, 51 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40406157&FileExtension=.PDF&FileName=FAA%20Inspector%20Statement-Master.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.