# NTSB CEN12CA409: Wilkinson Lorin L Hatz XB-II, N500L, Oshkosh, WI, July 1, 2012 - Type: NTSB accident investigation - Classification: Accident · No injuries · Data collection · Final report - Date: July 1, 2012, 11:36 local (16:36 UTC) - Place: Oshkosh, WI - Coordinates: 43.984443, -88.556945 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=43.9844&lon=-88.5569&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: 3 uninjured - Status: Completed, report October 9, 2012 - Report: Approved by Office Director - NTSB office: Central Region - Parties: FAA FSDO - NTSB case key (mKey): 84145 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CEN12CA409 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/84145/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=84145 - Page: https://openairdocs.org/ntsb/CEN12CA409 ## Probable cause The pilot's loss of directional control while landing with a 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: [Wilkinson Lorin L HATZ XB-II, 1 case](https://openairdocs.org/ntsb-findings/01062020/cases.md?model=05606ES), [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: [Wilkinson Lorin L HATZ XB-II, 1 case](https://openairdocs.org/ntsb-findings/02063040/cases.md?model=05606ES), [All aircraft, 9,295 cases](https://openairdocs.org/ntsb-findings/02063040/cases.md) - [Wind: crosswind](https://openairdocs.org/ntsb-findings/03034040): Environmental issues › Conditions/weather/phenomena · Response/compensation; cases with it: [Wilkinson Lorin L HATZ XB-II, 1 case](https://openairdocs.org/ntsb-findings/03034040/cases.md?model=05606ES), [All aircraft, 1,008 cases](https://openairdocs.org/ntsb-findings/03034040/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: [Wilkinson Lorin L HATZ XB-II, 1 case](https://openairdocs.org/ntsb-events/230/sequence.md?model=05606ES), [All aircraft, 4,585 cases](https://openairdocs.org/ntsb-events/230/sequence.md) - [Landing: Dragged wing/rotor/float/other](https://openairdocs.org/ntsb-events/093); cases with it: [Wilkinson Lorin L HATZ XB-II, 1 case](https://openairdocs.org/ntsb-events/093/sequence.md?model=05606ES), [All aircraft, 319 cases](https://openairdocs.org/ntsb-events/093/sequence.md) ## Analysis During the landing roll with about 5 knots of crosswind, the airplane turned to the left, and the pilot tried to correct the turn by adding control inputs. However, the airplane ground looped to the left and came to rest on the side of the runway. The airplane sustained substantial damage to its wings and fuselage. The pilot reported that he had landed the airplane in the past with much stronger crosswinds and felt comfortable with the conditions at the time. ## Factual narrative The pilot and two passengers returned to the airport after a short sight-seeing flight. On landing, the airplane had about 5 knots of crosswind. The airplane turned to the left and the pilot tried to correct the turn by adding control inputs. However, the airplane continued to turn left into a ground loop. The airplane came to rest on the side of the runway, with substantial damage to its wings and fuselage. The pilot reported that he had landed the airplane in the past with much stronger crosswinds and felt comfortable with the conditions at the time. ## Aircraft - Registration: [N500L](https://openairdocs.org/aircraft/N500L), registered now, S/N 500, built 1999 (OpenAirDocs) - Reported make and model: WILKINSON LORIN L HATZ XB-II - Registry model: [Wilkinson Lorin L HATZ XB-II](https://openairdocs.org/model/wilkinson-lorin-l-hatz-xb-ii) (registry code 05606ES) (OpenAirDocs) - Registry engine: [Amateur-built UNKNOWN ENG](https://openairdocs.org/engine/amateur-built-unknown-eng) (registry code 99999) (OpenAirDocs) - Category: Airplane, amateur-built - Serial number: 500 - Airframe hours: 231 - Engines: LOM Praha M332B 140 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Airworthiness certificate: Special, Experimental (Special) - Last inspection: Condition, November 1, 2011 - Departed: OSH, Oshkosh, WI - Destination: OSH, Oshkosh, WI - Flight plan: Unknown - Airport: OSH, Wittman Regional, runway 18, 8,002 × 150 ft, concrete ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 44; injuries: none; airline transport; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 1, with waivers/limitations; last flight review April 19, 2012; seat: rear; flight hours: 11,800 total, 131 in this make and model, 8,736 as pilot in command, 96 in the last 90 days, 35 in the last 30 days ## Weather - Conditions: Visual (VMC), Day - Wind: 90° at 5 knots - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 84 °F, dew point 55 °F - Altimeter: 30.00 inHg - Observed at: KOSH ## 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 20120701014129A](https://openairdocs.org/incident/20120701014129A), Jul 1, 2012: Wilkinson Lorin L HATZ XB-II, Oshkosh, WI, Substantial damage. The pilot stated that he had made a three point landing on runway 18 at Oshkosh, WI (kosh). After landing the pilot reported the aircraft pulled sharply left,… ## Docket (3 files) The files NTSB released with the investigation on August 13, 2012, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=84145. 3.3 MB in all. - Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1 (item 1, .PDF, 2.6 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40374458&FileExtension=.PDF&FileName=Pilot%2FOperator%20Aircraft%20Accident%20Report,%20NTSB%20Form%206120.1-Redacted.PDF - Weather Reports and Records (item 2, .PDF, 62 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40373200&FileExtension=.PDF&FileName=Weather%20Reports%20and%20Records-Master.PDF - Photo: Accident airplane (non NTSB photo) (item 3, .PDF, 684 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40373204&FileExtension=.PDF&FileName=Photo%3A%20Accident%20airplane%20%20%20%20%20%20%20%20%20%20(non%20NTSB%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.