# NTSB GAA16CA176: North American AT6, N107FG, Yukon, OK, April 2, 2016 - Type: NTSB accident investigation - Classification: Accident · No injuries · Data collection · Final report - Date: April 2, 2016, 15:00 local (20:00 UTC) - Place: Yukon, OK - Coordinates: 35.600276, -97.706108 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=35.6003&lon=-97.7061&mi=10 - Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping) - Defining event: [Landing: Loss of control on ground](https://openairdocs.org/ntsb-events/230) - Highest injury: No injuries - Injuries: 2 uninjured - Status: Completed, report June 1, 2016 - Report: Approved by Office Director - NTSB office: General Aviation Accidents - Parties: FAA - NTSB case key (mKey): 92959 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=GAA16CA176 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/92959/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=92959 - Page: https://openairdocs.org/ntsb/GAA16CA176 ## Probable cause The pilot's failure to maintain directional control during the landing roll in gusty wind conditions, which resulted in runway excursion and impact with terrain. ## 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: [North American AT-6D, 5 cases](https://openairdocs.org/ntsb-findings/01062020/cases.md?model=6400416), [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: [North American AT-6D, 7 cases](https://openairdocs.org/ntsb-findings/02063040/cases.md?model=6400416), [All aircraft, 9,295 cases](https://openairdocs.org/ntsb-findings/02063040/cases.md) - [Wind: gusts](https://openairdocs.org/ntsb-findings/03034045): Environmental issues › Conditions/weather/phenomena · Ability to respond/compensate; cases with it: [North American AT-6D, 2 cases](https://openairdocs.org/ntsb-findings/03034045/cases.md?model=6400416), [All aircraft, 1,199 cases](https://openairdocs.org/ntsb-findings/03034045/cases.md) ## Sequence of events The events NTSB coded, in order, by phase of flight. The defining event best describes what happened. - [Landing: Loss of control on ground](https://openairdocs.org/ntsb-events/230) (defining event); cases with it: [North American AT-6D, 6 cases](https://openairdocs.org/ntsb-events/230/sequence.md?model=6400416), [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: [North American AT-6D, 4 cases](https://openairdocs.org/ntsb-events/300/sequence.md?model=6400416), [All aircraft, 3,643 cases](https://openairdocs.org/ntsb-events/300/sequence.md) - [Landing-landing roll: Collision with terr/obj (non-CFIT) ](https://openairdocs.org/ntsb-events/470); cases with it: [North American AT-6D, 7 cases](https://openairdocs.org/ntsb-events/470/sequence.md?model=6400416), [All aircraft, 10,189 cases](https://openairdocs.org/ntsb-events/470/sequence.md) ## Analysis The pilot of the tailwheel-equipped airplane reported that as the tail came down during the landing roll in gusty wind conditions, a wind gust lifted the airplane about 10 feet into the air, with the left wing high. The pilot further reported that the airplane drifted off the runway to the right and impacted the ground right wing first. The airplane sustained substantial damage to the fuselage, both wings, and the empennage. According to the pilot there were no preimpact mechanical failures or malfunctions with the airframe or engine that would have precluded normal operation. A review of recorded data from the automated weather observation station located about 5 miles to the southeast, revealed that, about 7 minutes before the accident occurred, conditions were wind 300 degrees true at 13 knots, wind gust 18 knots. ## Factual narrative The pilot of the tailwheel-equipped airplane reported that as the tail came down during the landing roll in gusty wind conditions, a wind gust lifted the airplane about 10 feet into the air, with the left wing high. The pilot further reported that the airplane drifted off the runway to the right and impacted the ground right wing first. The airplane sustained substantial damage to the fuselage, both wings, and the empennage. According to the pilot there were no preimpact mechanical failures or malfunctions with the airframe or engine that would have precluded normal operation. A review of recorded data from the automated weather observation station located about 5 miles to the southeast, revealed that, about 7 minutes before the accident occurred, conditions were wind 300 degrees true at 13 knots, wind gust 18 knots. ## Aircraft - Registration: [N107FG](https://openairdocs.org/aircraft/N107FG), registered now, S/N 44-80858, built 1944 (OpenAirDocs) - Reported make and model: NORTH AMERICAN AT6 (D) - Registry model: [North American AT-6D](https://openairdocs.org/model/north-american-at-6d) (registry code 6400416) (OpenAirDocs) - Registry engine: [Pratt & Whitney R1340 series](https://openairdocs.org/engine/pratt-whitney-r1340-series) (registry code 52016, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 44-80858 - Year built: 1944 - Airframe hours: 9101.5 - Engines: P&W R1340 600 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Operator: Twin Lakes Aviation, LLC. - Registered owner: Twin Lakes Aviation, LLC. - Airworthiness certificate: Standard, Normal - Last inspection: Annual, July 7, 2015 - Departed: SWO, STILLWATER, OK - Destination: HSD, Yukon, OK - Airport: HSD, Sundance, runway 35, 5,001 × 100 ft, concrete - Equipment: Handheld GPS ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 45; injuries: none; commercial; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 2, without waivers/limitations; last flight review March 11, 2016; seat: front; restraint: 4-point; flight hours: 580 total, 108 in this make and model, 434 as pilot in command, 45 in the last 90 days, 14 in the last 30 days, 1 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 300° at 13 knots, gusting 18 - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 70 °F, dew point 30 °F - Altimeter: 30.17 inHg - Observed at: KPWA, 5 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 20160402002899A](https://openairdocs.org/incident/20160402002899A), Apr 2, 2016: North American AT-6D, Okc, OK, Substantial damage. During landing on the touchdown roll the aircraft departed the runway and cartwheeled. The engine was torn from the aircraft and the LH main gear strut broke… ## Docket (2 files) The files NTSB released with the investigation on May 23, 2016, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=92959. 2.1 MB in all. - Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1 (item 1, .PDF, 1.9 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40440316&FileExtension=.PDF&FileName=Pilot%2FOperator%20Aircraft%20Accident%20Report,%20NTSB%20Form%206120.1-Master.PDF - Accident Photo (Courtesy of FAA) (item 2, .PDF, 1 photo, 238 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40440317&FileExtension=.PDF&FileName=Accident%20Photo%20(Courtesy%20of%20FAA)-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.