# NTSB ERA10LA474: Ayres S2R-G10, N2312Y, Doerun, GA, September 10, 2010 - Type: NTSB accident investigation - Classification: Accident · No injuries · Limited investigation · Final report - Date: September 10, 2010, 11:15 local (15:15 UTC) - Place: Doerun, GA - Coordinates: 31.316667, -83.900001 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=31.3167&lon=-83.9000&mi=10 - Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping) - Defining event: [Maneuvering: Loss of engine power (partial)](https://openairdocs.org/ntsb-events/342) - Highest injury: No injuries - Injuries: 1 uninjured - Status: Completed, report January 17, 2012 - Report: Approved by Office Director - NTSB office: Eastern Region Aviation - Parties: Honeywell Aerospace, FAA/FSDO - NTSB case key (mKey): 77256 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ERA10LA474 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/77256/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=77256 - Page: https://openairdocs.org/ntsb/ERA10LA474 ## Probable cause A partial loss of engine power for undetermined reasons. Contributing to the accident was the pilot's failure to select an adequate forced landing site and his excess speed during the landing. ## Findings NTSB's coded findings; those marked are part of the probable cause. - [Not determined](https://openairdocs.org/ntsb-findings/05000000): Not determined › Not determined · Unknown/Not determined (probable cause); cases with it: [All aircraft, 2,247 cases](https://openairdocs.org/ntsb-findings/05000000/cases.md) - [Info processing/decision: decision making/judgment](https://openairdocs.org/ntsb-findings/02041520): Personnel issues › Action/decision · Pilot (probable cause); cases with it: [All aircraft, 3,098 cases](https://openairdocs.org/ntsb-findings/02041520/cases.md) - [Aircraft](https://openairdocs.org/ntsb-findings/01050000): Aircraft › Aircraft power plant · Not specified; cases with it: [All aircraft, 151 cases](https://openairdocs.org/ntsb-findings/01050000/cases.md) ## Sequence of events The events NTSB coded, in order, by phase of flight. The defining event best describes what happened. - [Maneuvering: Loss of engine power (partial)](https://openairdocs.org/ntsb-events/342) (defining event); cases with it: [All aircraft, 1,858 cases](https://openairdocs.org/ntsb-events/342/sequence.md) - [Emergency descent: Off-field or emergency landing](https://openairdocs.org/ntsb-events/440); cases with it: [All aircraft, 3,365 cases](https://openairdocs.org/ntsb-events/440/sequence.md) - [Landing-landing roll: Collision with terr/obj (non-CFIT) ](https://openairdocs.org/ntsb-events/470); cases with it: [All aircraft, 10,189 cases](https://openairdocs.org/ntsb-events/470/sequence.md) ## Analysis During an aerial application flight, the pilot felt a vibration and heard a loud whine. He observed that the exhaust gas temperature was above the temperature limit and was rising. Almost simultaneously, he observed that the indication on the torque meter was dropping. He then decided to make a precautionary landing in a pasture that adjoined the field that he was spraying. He landed the airplane in the pasture, but the airplane struck several large anthills, bouncing up and becoming airborne each time. The airplane then overran the pasture and struck trees. Examination of the airplane and engine did not reveal any evidence of preimpact failure or malfunction which would have caused or contributed to the loss of power reported by the pilot. The pilot advised that, when he decided to make a precautionary landing, he had a rush to judgment. He was fast on the approach and landed with a tailwind, and he could not get the airplane to stop before it hit the trees. ## Factual narrative HISTORY OF FLIGHT On September 10, 2010, about 1115 eastern daylight time, an Ayres Corporation S2R-G10, N2312Y, was substantially damaged when it impacted trees during a forced landing, following a loss of engine power near Doerun, Georgia. The certificated commercial pilot was not injured. Visual meteorological conditions prevailed, and no flight plan was filed for the local flight, which originated from a private airstrip in Doerun, Georgia. The aerial application flight was conducted under the provisions of Title 14 Code of Federal Regulations Part 137. According to the pilot, he was "finishing up" spraying a field and "doing clean up passes," when a vibration started and he heard a loud "whine." He observed that the exhaust gas temperature was above the temperature limit and was rising and almost simultaneously he observed that the indication on the torque meter was dropping. He then made a decision to make a precautionary landing in a pasture that adjoined the field that he was spraying. He landed in the pasture and struck several "large anthills" which caused the airplane to bounce up and become airborne each time. The airplane then overran the pasture and struck trees. PERSONNEL INFORMATION According to Federal Aviation Administration (FAA) records, the pilot held commercial pilot certificate with a rating for airplane single-engine land. He reported 17,247.6 total hours of flight experience. His most recent application for an FAA second-class medical certificate was on February 16, 2010. AIRCRAFT INFORMATION According to FAA and maintenance records, the airplane was manufactured in 1999. The airplane's most recent 100 hour inspection was completed on August 11, 2010. At the time of the accident, the airplane had accrued 4,481.6 total hours of operation. METEOROLOGICAL INFORMATION The recorded weather at Southwest Georgia Regional Airport (ABY) Albany, Georgia, approximately 22 nautical miles northwest of the accident site, at 1053, included: wind 300 degrees at 4 knots, visibility 10 miles, sky clear, temperature 31 degrees C, dew point 21 degrees C, and an altimeter setting of 30.03 inches of mercury. WRECKAGE AND IMPACT INFORMATION Examination of the accident site and airplane by an FAA inspector revealed that the airplane had come to rest after striking the trees. The wings were separated from their mounting locations, the fuselage was broken open at the firewall, and the engine had separated from its mounting location. TESTS AND RESEARCH Examination of the engine revealed that the type and degree of damage was indicative of the engine's internal components being operational and in motion (rotating) during the impact with the ground. No preexisting failures or malfunctions were discovered during the examination. The propeller reduction output assembly was found to be decoupled from the engine power group which was indicative of a propeller strike. Continuity was confirmed from the compressor to the aft turbine. All of the planetarygears were intact and the gearbox contained approximately 8 fluid ounces of oil which appeared clean. Aluminum spatter was also discovered on the second and third stage stator blades, which was indicative of ignition in the combustor being present during impact, and the torsion shaft was fractured from torsional overload at its forward end. Additionally, the fuel control unit was functional, the propeller governor was functional, and the inlet sensor was functional. ADDITIONAL INFORMATION On September 14, 2010, during an interview with the NTSB, the pilot advised that when he decided to make a precautionary landing he "had a rush to judgment". He was "a little hot" (fast) on the approach, and he landed with a tailwind and could not get the airplane to stop before he hit the trees. Requests for a follow up interview with the pilot went unanswered. ## Aircraft - Registration: N2312Y (not matched to a registry record) - Reported make and model: AYRES S2R-G10 - Category: Airplane - Serial number: G10-157 - Airframe hours: 4482 - Engines: Garett TPE-331-10 900 horsepower turbo prop - Damage: Substantial damage - Flight: Aerial application, Part 137 - Operator: Thaggard Aviation LLC - Registered owner: 4S Aviation - Airworthiness certificate: Special, Restricted (Special) - Last inspection: 100 hour, August 11, 2010 - Departed: Doerun, GA - Destination: Doerun, GA ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 49; injuries: none; commercial; airplane ratings: single-engine land; medical: class 2, with waivers/limitations; last flight review January 15, 2009; seat: single; flight hours: 17,248 total, 1,225 in this make and model ## Weather - Conditions: Visual (VMC), Day - Wind: 300° at 4 knots - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 88 °F, dew point 70 °F - Altimeter: 30.03 inHg - Observed at: ABY, 22 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 20100910048049A](https://openairdocs.org/incident/20100910048049A), Sep 10, 2010: Ayres Corpo S2R-G10, Doerun, GA, Destroyed. Aircraft N2312Y had loss of power while spraying a peanut field approx. 3.5 miles south of Doerun, GA. The pilot attempted to make an emergency landing in a… ## Docket (8 files) The files NTSB released with the investigation on December 8, 2011, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=77256. 5.4 MB in all. - Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1 (item 1, .PDF, 573 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40359462&FileExtension=.PDF&FileName=Pilot%2FOperator%20Aircraft%20Accident%20Report,%20NTSB%20Form%206120.1-Redacted.PDF - Witness Statements and Interview Summaries (item 2, .PDF, 81 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40359463&FileExtension=.PDF&FileName=Witness%20Statements%20and%20Interview%20Summaries-Redacted.PDF - Weather Reports and Records (item 3, .PDF, 209 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40359465&FileExtension=.PDF&FileName=Weather%20Reports%20and%20Records-Master.PDF - Statement of Party Representatives to NTSB Investigation (item 4, .PDF, 338 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40359475&FileExtension=.PDF&FileName=Statement%20of%20Party%20Representatives%20to%20NTSB%20Investigation-Redacted.PDF - Photograph of Accident Site (FAA) (item 5, .PDF, 1.1 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40359514&FileExtension=.PDF&FileName=Photograph%20of%20Accident%20Site%20(FAA)-Master.PDF - Photograph of Tire Marks (FAA) (item 6, .PDF, 1.3 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40359515&FileExtension=.PDF&FileName=Photograph%20of%20Tire%20Marks%20(FAA)-Master.PDF - Photograph of Main Wreckage (FAA) (item 7, .PDF, 1.2 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40359516&FileExtension=.PDF&FileName=Photograph%20of%20Main%20Wreckage%20(FAA)-Master.PDF - Photograph of Propeller (FAA) (item 8, .PDF, 466 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40359517&FileExtension=.PDF&FileName=Photograph%20of%20Propeller%20(FAA)-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.