# NTSB CEN23LA157: Acro Sport II, N39GC, Skiatook, OK, April 11, 2023 - Type: NTSB accident investigation - Classification: Accident · Minor injuries · Class 4 · Limited · Final report - Date: April 11, 2023, 21:00 UTC - Place: Skiatook, OK - Coordinates: 36.356134, -96.010997 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=36.3561&lon=-96.0110&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: Minor injuries - Injuries: 1 minor - Status: Completed - Report: Approved by Office Director - Investigation class: Class 4 - Basic report with no Prelim publish - NTSB office: Central Region - Parties: Federal Aviation Administration - NTSB case key (mKey): 107055 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CEN23LA157 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/107055/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=107055 - Page: https://openairdocs.org/ntsb/CEN23LA157 ## Probable cause The pilot's failure to maintain directional control during landing in a gusting crosswind. ## 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: [Jones George C ACRO SPORT II, 1 case](https://openairdocs.org/ntsb-findings/01062020/cases.md?model=05646AL), [All aircraft, 3,958 cases](https://openairdocs.org/ntsb-findings/01062020/cases.md) - [Experience/qualifications: total experience w/ equipment](https://openairdocs.org/ntsb-findings/02031025): Personnel issues › Experience/knowledge · Pilot; cases with it: [Jones George C ACRO SPORT II, 1 case](https://openairdocs.org/ntsb-findings/02031025/cases.md?model=05646AL), [All aircraft, 269 cases](https://openairdocs.org/ntsb-findings/02031025/cases.md) - [Use of equip/info: aircraft control](https://openairdocs.org/ntsb-findings/02063040): Personnel issues › Task performance · Pilot; cases with it: [Jones George C ACRO SPORT II, 1 case](https://openairdocs.org/ntsb-findings/02063040/cases.md?model=05646AL), [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 · Contributed to outcome (probable cause); cases with it: [Jones George C ACRO SPORT II, 1 case](https://openairdocs.org/ntsb-findings/03034045/cases.md?model=05646AL), [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: [Jones George C ACRO SPORT II, 1 case](https://openairdocs.org/ntsb-events/230/sequence.md?model=05646AL), [All aircraft, 4,585 cases](https://openairdocs.org/ntsb-events/230/sequence.md) - [Landing: Runway excursion](https://openairdocs.org/ntsb-events/300); cases with it: [Jones George C ACRO SPORT II, 1 case](https://openairdocs.org/ntsb-events/300/sequence.md?model=05646AL), [All aircraft, 3,643 cases](https://openairdocs.org/ntsb-events/300/sequence.md) - [Landing: Collision with terr/obj (non-CFIT) ](https://openairdocs.org/ntsb-events/470); cases with it: [Jones George C ACRO SPORT II, 1 case](https://openairdocs.org/ntsb-events/470/sequence.md?model=05646AL), [All aircraft, 10,189 cases](https://openairdocs.org/ntsb-events/470/sequence.md) ## Analysis The pilot reported that he had just purchased the airplane and the accident flight was his first flight in it. While performing a touch-and-go-landing with a left gusting crosswind, the airplane veered right, departed the runway, and struck a runway light. The left main landing gear separated, and the airplane came to rest in the grass next to the taxiway. The airplane sustained substantial damage to the fuselage and lower wings. The pilot reported that there were no preaccident mechanical malfunctions or failures with the airplane that would have precluded normal operations. At the time of the accident, the airplane was landing on runway 18 with wind variable at 12 knots with gusts to 21 knots. The pilot reported that he did not look at the windsock before the landing. ## Aircraft - Registration: [N39GC](https://openairdocs.org/aircraft/N39GC), registered now, S/N AS123, built 1980 (OpenAirDocs) - Reported make and model: Acro Sport II - Registry model: [Jones George C ACRO SPORT II](https://openairdocs.org/model/jones-george-c-acro-sport-ii) (registry code 05646AL) (OpenAirDocs) - Registry engine: [Lycoming O&VO-360 series](https://openairdocs.org/engine/lycoming-o-vo-360-series) (registry code 41514, reciprocating) (OpenAirDocs) - Category: Airplane, amateur-built - Serial number: AS123 - Year built: 1980 - Airframe hours: 571 - Engines: Lycoming O-360 180 horsepower reciprocating - Damage: Substantial damage - Flight: Ferry, Part 91 - Airworthiness certificate: Special, Experimental (Special) - Last inspection: Condition, October 22, 2022, 6 hours before - Departed: 37T, Calico Rock, AL - Destination: kbgd, Borger, TX - Airport: 2F6, Skiatook Muni, runway 18, 3,002 × 60 ft, asphalt - Equipment: Electronic flight bag or handheld device ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 30; injuries: minor; private; airplane ratings: single-engine land; medical: class 2, with waivers/limitations; last flight review September 22, 2022; seat: rear; restraint: 5-point; flight hours: 130.6 total, 5.5 in this make and model, 81.7 as pilot in command, 11.8 in the last 90 days, 7 in the last 30 days, 0 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 150° at 12 knots, gusting 21 - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 77 °F, dew point 46 °F - Altimeter: 30.19 inHg - Observed at: KTUL, 11 nm away - METAR: KTUL 112053Z 15012G21KT 10SM FEW070 25/08 A3019 RMK AO2 PK WND 18027/2006 SLP216 T02500083 56024 ## 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 20230411004009A](https://openairdocs.org/incident/20230411004009A), Apr 11, 2023: Jones George C ACRO SPORT II, Skiatook, OK, Substantial damage. Pilot was practicing touch and go landings at Skiatook Municipal Airport (2F6), Oklahoma before stopping to get fuel on a leg of a trip from Alabama to Texas… ## Docket (2 files) The files NTSB released with the investigation on June 7, 2023, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=107055. 3.7 MB in all. - Pilot/operator aircraft accident report, NTSB form 6120.1 (item 1, PDF, 11 pages, 2.1 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=15433079&FileExtension=pdf&FileName=CEN23LA157%206120_Redacted-Rel.pdf - Photos (item 2, PDF, 4 pages, 4 photos, 1.6 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=15432840&FileExtension=pdf&FileName=Photo%20Array%20CEN23LA157-Rel.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.