# NTSB GAA17CA451: Mark Goldberg Bearhawk Patrol, N410BP, Oshkosh, WI, July 28, 2017 - Type: NTSB accident investigation - Classification: Accident · No injuries · Data collection · Final report - Date: July 28, 2017, 10:30 local (15:30 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-landing roll: Loss of control on ground](https://openairdocs.org/ntsb-events/230) - Highest injury: No injuries - Injuries: 2 uninjured - Status: Completed, report November 14, 2017 - Report: Approved by Office Director - NTSB office: General Aviation Accidents - Parties: FAA/ FSDO - NTSB case key (mKey): 95706 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=GAA17CA451 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/95706/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=95706 - Page: https://openairdocs.org/ntsb/GAA17CA451 ## Probable cause The pilot's failure to maintain directional control during the landing roll in crosswind conditions, which resulted in a ground loop. ## Findings NTSB's coded findings; those marked are part of the probable cause. - [Use of equip/info: aircraft control](https://openairdocs.org/ntsb-findings/02063040): Personnel issues › Task performance · Pilot (probable cause); cases with it: [Mark Goldberg BEARHAWK PATROL, 1 case](https://openairdocs.org/ntsb-findings/02063040/cases.md?model=056308U), [All aircraft, 9,295 cases](https://openairdocs.org/ntsb-findings/02063040/cases.md) - [Performance/control parameters: directional control](https://openairdocs.org/ntsb-findings/01062020): Aircraft › Aircraft oper/perf/capability · Not attained/maintained (probable cause); cases with it: [Mark Goldberg BEARHAWK PATROL, 1 case](https://openairdocs.org/ntsb-findings/01062020/cases.md?model=056308U), [All aircraft, 3,958 cases](https://openairdocs.org/ntsb-findings/01062020/cases.md) - [Wind: crosswind](https://openairdocs.org/ntsb-findings/03034040): Environmental issues › Conditions/weather/phenomena · Effect on operation; cases with it: [Mark Goldberg BEARHAWK PATROL, 1 case](https://openairdocs.org/ntsb-findings/03034040/cases.md?model=056308U), [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-landing roll: Other weather encounter](https://openairdocs.org/ntsb-events/400); cases with it: [Mark Goldberg BEARHAWK PATROL, 1 case](https://openairdocs.org/ntsb-events/400/sequence.md?model=056308U), [All aircraft, 1,127 cases](https://openairdocs.org/ntsb-events/400/sequence.md) - [Landing-landing roll: Loss of control on ground](https://openairdocs.org/ntsb-events/230) (defining event); cases with it: [Mark Goldberg BEARHAWK PATROL, 1 case](https://openairdocs.org/ntsb-events/230/sequence.md?model=056308U), [All aircraft, 4,585 cases](https://openairdocs.org/ntsb-events/230/sequence.md) - [Landing-landing roll: Landing gear collapse](https://openairdocs.org/ntsb-events/094); cases with it: [Mark Goldberg BEARHAWK PATROL, 1 case](https://openairdocs.org/ntsb-events/094/sequence.md?model=056308U), [All aircraft, 1,787 cases](https://openairdocs.org/ntsb-events/094/sequence.md) - [Landing-landing roll: Abnormal runway contact](https://openairdocs.org/ntsb-events/090); cases with it: [Mark Goldberg BEARHAWK PATROL, 1 case](https://openairdocs.org/ntsb-events/090/sequence.md?model=056308U), [All aircraft, 1,506 cases](https://openairdocs.org/ntsb-events/090/sequence.md) ## Analysis The pilot of the tailwheel-equipped airplane reported that, during the landing roll in crosswind conditions, when "transitioning from rudder to braking, the tail started rapidly swinging to the left due to wind." He added that "rudder correction was ineffective," and he applied wheel brakes, but the airplane continued in the ground loop clockwise, the left main landing gear collapsed, and the left wing impacted the runway. The left wing sustained substantial damage. The pilot reported that there were no preaccident mechanical malfunctions or failures with the airplane that would have precluded normal operation. An automated weather observation station at the accident airport reported, about the time of the accident, wind from 040° at 8 knots. The pilot reported that, while on short final, the air traffic tower controller announced, "wind 050 at 12." The pilot added that the landing was on runway 36. ## Factual narrative The pilot of the tailwheel-equipped airplane reported that, during the landing roll in crosswind conditions, when "transitioning from rudder to braking the tail started rapidly swinging to the left due to wind." He added that "rudder correction was ineffective" and he applied wheel brakes, but the airplane continued in the ground loop clockwise, the left main landing gear collapsed, and the left wing impacted the runway. The left wing sustained substantial damage. The pilot reported that there were no preaccident mechanical malfunctions or failures with the airplane that would have precluded normal operation. An automated weather observation station, about the time of the accident, at the accident airport, reported wind from 040° at 8 knots. The pilot reported that while on short final the air traffic tower controller announced, "wind 050 at 12." The pilot added that the landing was on runway 36. ## Aircraft - Registration: [N410BP](https://openairdocs.org/aircraft/N410BP), registered now, S/N P01-P001/P002-P121, built 2012 (OpenAirDocs) - Reported make and model: MARK GOLDBERG BEARHAWK PATROL (NO SERIES) - Registry model: [Mark Goldberg BEARHAWK PATROL](https://openairdocs.org/model/mark-goldberg-bearhawk-patrol) (registry code 056308U) (OpenAirDocs) - Registry engine: [Lycoming O-360 series](https://openairdocs.org/engine/lycoming-o-360-series) (registry code 41575, reciprocating) (OpenAirDocs) - Category: Airplane, amateur-built - Serial number: P01-P001/P002-P - Year built: 2012 - Engines: Lycoming O-360 reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Airworthiness certificate: Special, Experimental (Special) - Departed: OSH, Oshkosh, WI - Destination: OSH, Oshkosh, WI - Airport: OSH, Wittman Rgnl, runway 36, 8,002 × 150 ft, concrete ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 61; injuries: none; private; airplane ratings: single-engine land; instrument ratings: airplane; medical: basicmed, with waivers/limitations; seat: front; restraint: 4-point; flight hours: 742 total, 43 in this make and model, 692 as pilot in command, 20 in the last 90 days, 19 in the last 30 days, 5 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 40° at 8 knots - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 72 °F, dew point 57 °F - Altimeter: 30.07 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 20170728012659A](https://openairdocs.org/incident/20170728012659A), Jul 28, 2017: Mark Goldberg BEARHAWK PATROL, Oshkosh, WI, Substantial damage. Aircraft landing Oshkosh runway 36 ground looped after touchdown. Winds 050@12 knots. ## Docket (2 files) The files NTSB released with the investigation on October 20, 2017, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=95706. 1.3 MB in all. - Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1 (item 1, .PDF, 1.2 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40457259&FileExtension=.PDF&FileName=Pilot%2FOperator%20Aircraft%20Accident%20Report,%20NTSB%20Form%206120.1-Master.PDF - Accident Photo (Courtesy of FAA) (item 2, .PDF, 1 photo, 141 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40457260&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.