# NTSB CEN11LA323: Air Tractor AT-402A, N5192F, Arriba, CO, May 5, 2011 - Type: NTSB accident investigation - Classification: Accident · Serious injuries · Limited investigation · Final report - Date: May 5, 2011, 17:30 local (23:30 UTC) - Place: Arriba, CO - Coordinates: 39.279323, -103.270805 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=39.2793&lon=-103.2708&mi=10 - Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping) - Defining event: [Enroute: Controlled flight into terr/obj (CFIT)](https://openairdocs.org/ntsb-events/120) - Highest injury: Serious injuries - Injuries: 1 serious - Status: Completed, report May 3, 2012 - Report: Approved by Office Director - NTSB office: Central Region - Parties: FAA FSDO - NTSB case key (mKey): 79049 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CEN11LA323 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/79049/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=79049 - Page: https://openairdocs.org/ntsb/CEN11LA323 ## Probable cause The pilot’s controlled flight into terrain for undetermined reasons. ## Findings NTSB's coded findings; those marked are part of the probable cause. - [Performance/control parameters: altitude](https://openairdocs.org/ntsb-findings/01062012): Aircraft › Aircraft oper/perf/capability · Not attained/maintained (probable cause); cases with it: [Air Tractor AT-402A, 2 cases](https://openairdocs.org/ntsb-findings/01062012/cases.md?model=0390206), [All aircraft, 1,310 cases](https://openairdocs.org/ntsb-findings/01062012/cases.md) - [Not determined](https://openairdocs.org/ntsb-findings/05000000): Not determined › Not determined · Unknown/Not determined (probable cause); cases with it: [Air Tractor AT-402A, 1 case](https://openairdocs.org/ntsb-findings/05000000/cases.md?model=0390206), [All aircraft, 2,247 cases](https://openairdocs.org/ntsb-findings/05000000/cases.md) ## Sequence of events The events NTSB coded, in order, by phase of flight. The defining event best describes what happened. - [Enroute: Controlled flight into terr/obj (CFIT)](https://openairdocs.org/ntsb-events/120) (defining event); cases with it: [Air Tractor AT-402A, 2 cases](https://openairdocs.org/ntsb-events/120/sequence.md?model=0390206), [All aircraft, 1,074 cases](https://openairdocs.org/ntsb-events/120/sequence.md) ## Analysis The pilot completed an aerial application portion of his flight and departed from the work area. The airplane collided with the ground at a high speed in a flat, open field about 7 miles from the work area. The pilot sustained serious injuries and was unable to recall any of the events preceding the accident. Postaccident examination of the airplane did not identify any preimpact abnormalities with the airframe or engine. The airplane’s three-bladed propeller displayed signatures that were consistent with the engine producing power at the time of impact. Data recovered from an on-board GPS unit tracked the airplane from departure to the accident site. The data showed that, during the final minute of the flight, the airplane’s airspeed increased and its altitude decreased. The flight profile is consistent with a controlled flight into terrain (CFIT) for undetermined reasons. ## Factual narrative On May 5, 2011, about 1730 mountain daylight time an Air Tractor AT-402A airplane, N5192F, impacted terrain after descending from cruise flight near Arriba, Colorado. The commercial pilot received serious injuries. The airplane sustained substantial damage. The aircraft was registered to and operated by a private individual under the provisions of 14 Code of Federal Regulations Part 137 agricultural flight. Visual meteorological conditions prevailed for the flight, which was not operating on a flight plan. The airplane departed a private airfield about 1630. A witness observed the airplane at a low altitude heading in a southeasterly direction. Shortly after that, the airplane impacted the ground at a high rate of speed. The witness also noted that the airplane was not performing aerial application at the time. The first responders were able to assist the pilot from the airplane. The pilot was hospitalized and could not remember the details of the flight. A Federal Aviation Administration Inspector responded to the accident site, which was a wide open flat field used for farm crops and no trees or obstacles in the vicinity. The airplane had extensive damage to the airframe and no postcrash fire. All components of the airplane were accounted for at the accident site. The wreckage was recovered and a follow-up exam conducted at a salvage yard. Examination of the wreckage at the salvage yard revealed control continuity and no pre-impact abnormalities with the airframe. A visual examination of the propeller revealed that all three blades had similar bends and marks. One propeller blade had about 6-inches of the blade tip torn off. Two blades were curled towards the non-cambered side with polishing of the blades. The third blade had multiple bends. The signatures and marks on the three-bladed propeller are consistent with engine power at the time of the accident. A SOTLOC global positioning system (GPS) data card was removed from the airplane and forwarded to the NTSB Vehicle Recorders Laboratory for data extraction. Review of the SATLOC data for the accident date started near Arriba, Colorado, at 1536:40 mountain standard time [the time has not been corrected for daylight savings]. The data tracked the airplane in a northwest direction, before the airplane appeared to work an area with multiple back-n-forth tracks. An individual track was then identified as the airplane headed in an easterly direction. The data revealed the airplane was at an altitude of about 5,300 (mean sea level) and an airspeed of 140 knots. The altitude remained about the same until approximately one minute before the data ends at 1626:27. About 1625:00, the airplane started a descent from 5,300 feet and ended at an altitude of about 5,033 feet. According to Google Earth, the elevation of the ground in the general vicinity of the accident site was about 5,080 feet. In the last two minutes of data, the airplane increased its speed from about 140 knots to 158 knots, when the dataends. ## Aircraft - Registration: [N5192F](https://openairdocs.org/aircraft/N5192F), registered now, S/N 402A-1093, built 1999 (OpenAirDocs) - Reported make and model: AIR TRACTOR INC AT-402A - Registry model: [Air Tractor AT-402A](https://openairdocs.org/model/air-tractor-at-402a) (registry code 0390206) (OpenAirDocs) - Registry engine: [Pratt & Whitney PT6A series](https://openairdocs.org/engine/pratt-whitney-pt6a-series) (registry code 52034, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 402A-1093 - Airframe hours: 2249 - Engines: P&W PT6A SERIES 500 horsepower turbo prop - Damage: Substantial damage - Flight: Aerial application, Part 137 - Airworthiness certificate: Special, Restricted (Special) - Last inspection: Annual, October 10, 2010 - Departed: Arriba, CO - Destination: Arriba, CO ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 54; injuries: serious; commercial, flight instructor; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 2, unknown; last flight review November 6, 2010; seat: single; flight hours: 8,209 total, 1,812 in this make and model, 8,029 as pilot in command, 35 in the last 90 days, 24 in the last 30 days, 4 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 160° at 10 knots - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 64 °F, dew point 27 °F - Altimeter: 30.09 inHg - Observed at: KLIC, 25 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 20110505008369A](https://openairdocs.org/incident/20110505008369A), May 5, 2011: Air Tractor Inc AT-402A, Arriba, CO, Destroyed. On may 5, 2011, at 13:30 MST, Air tractor 402, N5192F, registered to [privacy data omitted]. The pilot of the aircraft crashed while return from an aerial… ## Docket (10 files) The files NTSB released with the investigation on March 27, 2012, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=79049. 1.5 MB in all. - Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1 (item 1, .PDF, 620 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40363721&FileExtension=.PDF&FileName=Pilot%2FOperator%20Aircraft%20Accident%20Report,%20NTSB%20Form%206120.1-Redacted.PDF - Release of Aircraft Wreckage, NTSB Form 6120.15 (item 2, .PDF, 93 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40363723&FileExtension=.PDF&FileName=Release%20of%20Aircraft%20Wreckage,%20NTSB%20Form%206120.15-Redacted.PDF - Weather Reports and Records (item 3, .PDF, 56 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40363731&FileExtension=.PDF&FileName=Weather%20Reports%20and%20Records-Master.PDF - Global Positioning System Device - Specialist's Factual Report (item 4, .PDF, 328 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40361383&FileExtension=.PDF&FileName=Global%20Positioning%20System%20Device%20-%20Specialist%27s%20Factual%20Report-Master.PDF - Global Positioning System Device - Specialist's Factual Report - Attachment 1 (item 5, .CSV, 138 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40361384&FileExtension=.csv&FileName=Global%20Positioning%20System%20Device%20-%20Specialist%27s%20Factual%20Report%20-%20Attachment%201-Master.csv - Photo 1: Airplane in open field (FAA photo) (item 6, .PDF, 49 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40363750&FileExtension=.PDF&FileName=Photo%201%3A%20Airplane%20in%20open%20field%20%20(FAA%20photo)-Master.PDF - Photo 2: Airplane wreckage (FAA photo) (item 7, .PDF, 49 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40363751&FileExtension=.PDF&FileName=Photo%202%3A%20Airplane%20wreckage%20%20%20%20%20(FAA%20photo)-Master.PDF - Photo 3: Airplane wreckage (FAA photo) (item 8, .PDF, 48 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40363755&FileExtension=.PDF&FileName=Photo%203%3A%20%20Airplane%20wreckage%20%20%20(FAA%20photo)-Master.PDF - Photo 4: Airplane wreckage (FAA photo) (item 9, .PDF, 48 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40363759&FileExtension=.PDF&FileName=Photo%204%3A%20Airplane%20wreckage%20(FAA%20photo)-Master.PDF - Photo 5: Airplane wreckage (FAA photo) (item 10, .PDF, 48 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40363762&FileExtension=.PDF&FileName=Photo%205%3A%20Airplane%20wreckage%20(FAA%20photo)-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.