# NTSB GAA18CA555: Himmeroeder Hansgeorg Bearhawk, N152GH, Williams, CA, September 9, 2018 - Type: NTSB accident investigation - Classification: Accident · No injuries · Data collection · Final report - Date: September 9, 2018, 11:30 local (18:30 UTC) - Place: Williams, CA - Coordinates: 39.164443, -122.131668 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=39.1644&lon=-122.1317&mi=10 - Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping) - Defining event: [Landing-landing roll: Loss of control on ground](https://openairdocs.org/ntsb-events/230) - Highest injury: No injuries - Injuries: 1 uninjured - Status: Completed, report March 18, 2019 - Report: Approved by Office Director - NTSB office: General Aviation Accidents - Parties: FAA - NTSB case key (mKey): 98297 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=GAA18CA555 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/98297/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=98297 - Page: https://openairdocs.org/ntsb/GAA18CA555 ## Probable cause The pilot’s failure to maintain directional control during the landing roll. ## 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: [Himmeroeder Hansgeorg BEARHAWK, 1 case](https://openairdocs.org/ntsb-findings/01062020/cases.md?model=05631UE), [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: [Himmeroeder Hansgeorg BEARHAWK, 1 case](https://openairdocs.org/ntsb-findings/02063040/cases.md?model=05631UE), [All aircraft, 9,295 cases](https://openairdocs.org/ntsb-findings/02063040/cases.md) ## Sequence of events The events NTSB coded, in order, by phase of flight. The defining event best describes what happened. - [Landing-landing roll: Loss of control on ground](https://openairdocs.org/ntsb-events/230) (defining event); cases with it: [Himmeroeder Hansgeorg BEARHAWK, 1 case](https://openairdocs.org/ntsb-events/230/sequence.md?model=05631UE), [All aircraft, 4,585 cases](https://openairdocs.org/ntsb-events/230/sequence.md) - [Landing-landing roll: Attempted remediation/recovery](https://openairdocs.org/ntsb-events/060); cases with it: [Himmeroeder Hansgeorg BEARHAWK, 1 case](https://openairdocs.org/ntsb-events/060/sequence.md?model=05631UE), [All aircraft, 1,422 cases](https://openairdocs.org/ntsb-events/060/sequence.md) - [Landing-landing roll: Landing gear collapse](https://openairdocs.org/ntsb-events/094); cases with it: [Himmeroeder Hansgeorg BEARHAWK, 1 case](https://openairdocs.org/ntsb-events/094/sequence.md?model=05631UE), [All aircraft, 1,787 cases](https://openairdocs.org/ntsb-events/094/sequence.md) - [Landing-landing roll: Collision with terr/obj (non-CFIT) ](https://openairdocs.org/ntsb-events/470); cases with it: [Himmeroeder Hansgeorg BEARHAWK, 1 case](https://openairdocs.org/ntsb-events/470/sequence.md?model=05631UE), [All aircraft, 10,189 cases](https://openairdocs.org/ntsb-events/470/sequence.md) ## Analysis The pilot of the tailwheel-equipped airplane reported that, during the landing roll in the grass left of an asphalt runway with light wind conditions, the airplane veered left. He attempted to recover, but his flight control input was ineffective. The airplane ground looped to the left, the right landing gear collapsed, and the right wing impacted a ditch. The airplane sustained substantial damage to the right wing. The pilot reported that there were no preaccident mechanical failures or malfunctions with the airplane that would have precluded normal operation. ## Factual narrative The pilot of the tailwheel-equipped airplane reported that, during the landing roll in the grass to the left of an asphalt runway with light wind conditions, the airplane veered left. He attempted to recover, but his flight control input was ineffective. The airplane ground looped to the left, the right landing gear collapsed, and the right wing impacted a ditch. The airplane sustained substantial damage to the right wing. The pilot reported that there were no preaccident mechanical failures or malfunctions with the airplane that would have precluded normal operation. ## Aircraft - Registration: [N152GH](https://openairdocs.org/aircraft/N152GH), registered now, S/N 052-99/100-867, built 2012 (OpenAirDocs) - Reported make and model: HIMMEROEDER HANSGEORG BEARHAWK - Registry model: [Himmeroeder Hansgeorg BEARHAWK](https://openairdocs.org/model/himmeroeder-hansgeorg-bearhawk) (registry code 05631UE) (OpenAirDocs) - Registry engine: [Lycoming IO-540-D4A5](https://openairdocs.org/engine/lycoming-io-540-d4a5) (registry code 41798, reciprocating) (OpenAirDocs) - Category: Airplane, amateur-built - Serial number: 052-99/100-867 - Year built: 2012 - Airframe hours: 450.5 - Engines: Lycoming YIO-540-D4A5 260 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Airworthiness certificate: Special, Experimental (Special) - Last inspection: Annual, November 29, 2017 - Departed: CN12, Williams, CA - Destination: CN12, Williams, CA - Airport: CN12, Williams, runway 16, 2,500 × 40 ft, grass/turf - Equipment: Stall warning system, Electronic primary flight display ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 65; injuries: none; commercial, airline transport, flight instructor; airplane ratings: single-engine sea, single-engine land, multi-engine land; instrument ratings: airplane; medical: class 2, with waivers/limitations; last flight review March 13, 2018; seat: left; restraint: 4-point; flight hours: 22,600 total, 13 in this make and model, 20,000 as pilot in command, 30 in the last 90 days, 10 in the last 30 days ## Weather - Conditions: Visual (VMC), Day - Wind: variable at 4 knots - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 84 °F, dew point 52 °F - Altimeter: 29.87 inHg - Observed at: KMYV, 27 nm away ## Docket (2 files) The files NTSB released with the investigation on December 12, 2018, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=98297. 3.7 MB in all. - Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1 (item 1, .PDF, 3.4 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40469299&FileExtension=.PDF&FileName=Pilot%2FOperator%20Aircraft%20Accident%20Report,%20NTSB%20Form%206120.1-Master.PDF - Accident Photo (item 2, .PDF, 1 photo, 305 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40469300&FileExtension=.PDF&FileName=Accident%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.