# NTSB CEN18TA296: Fisher Dakato Hawk, N677TS, Oshkosh, WI, July 26, 2018 - Type: NTSB accident investigation - Classification: Accident · No injuries · Final report - Date: July 26, 2018, 18:55 local (23:55 UTC) - Place: Oshkosh, WI - Coordinates: 43.969722, -88.567779 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=43.9697&lon=-88.5678&mi=10 - Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping) - Defining event: [Landing-landing roll: Landing gear collapse](https://openairdocs.org/ntsb-events/094) - Highest injury: No injuries - Injuries: 2 uninjured - Status: Completed, report November 6, 2019 - Report: Approved by Office Director - NTSB office: Central Region - Parties: Federal Aviation Administration - NTSB case key (mKey): 97897 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CEN18TA296 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/97897/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=97897 - Page: https://openairdocs.org/ntsb/CEN18TA296 ## Probable cause The failure of the left main landing gear for reasons that could not be determined, which resulted in a loss of directional control during the ground roll. ## Findings NTSB's coded findings; those marked are part of the probable cause. - [Not determined](https://openairdocs.org/ntsb-findings/05000000): Not determined › Not determined · Unknown/Not determined (probable cause); cases with it: [Makepeace Mike DAKATO HAWK, 1 case](https://openairdocs.org/ntsb-findings/05000000/cases.md?model=05634ZF), [All aircraft, 2,247 cases](https://openairdocs.org/ntsb-findings/05000000/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: Landing gear collapse](https://openairdocs.org/ntsb-events/094) (defining event); cases with it: [Makepeace Mike DAKATO HAWK, 1 case](https://openairdocs.org/ntsb-events/094/sequence.md?model=05634ZF), [All aircraft, 1,787 cases](https://openairdocs.org/ntsb-events/094/sequence.md) - [Landing-landing roll: Loss of control on ground](https://openairdocs.org/ntsb-events/230); cases with it: [Makepeace Mike DAKATO HAWK, 1 case](https://openairdocs.org/ntsb-events/230/sequence.md?model=05634ZF), [All aircraft, 4,585 cases](https://openairdocs.org/ntsb-events/230/sequence.md) - [Landing-landing roll: Collision with terr/obj (non-CFIT) ](https://openairdocs.org/ntsb-events/470); cases with it: [Makepeace Mike DAKATO HAWK, 1 case](https://openairdocs.org/ntsb-events/470/sequence.md?model=05634ZF), [All aircraft, 10,189 cases](https://openairdocs.org/ntsb-events/470/sequence.md) ## Analysis The private pilot was landing the airplane on the runway at an ultralight airfield. After the airplane touched down, the left main landing gear (MLG) collapsed at the bottom end of the strut. The airplane ground looped, and the right wingtip struck the ground. The pilot stated that the landing was smooth and gentle, not hard, and that there was no side load on the landing gear at touchdown. He added that he suspected that a previous landing may have been hard, which resulted in a crack in the landing gear. An examination of the left MLG revealed that the upper/outer strut tubing was broken, and the lower/inner strut tubing was bent. There was no evidence of fatigue. It could not be determined if the crack occurred as a result of the accident or was preexisting. ## Factual narrative On July 26, 2018, about 1855 central daylight time, an amateur-built Fisher Dakato Hawk airplane, N677TS, was substantially damaged while landing at Wittman Regional Airport (KOSH), Oshkosh, Wisconsin. The private pilot and passenger were not injured. The personal flight was conducted under the provisions of Title 14 Code of Federal Regulations Part 91. Visual meteorological conditions prevailed and no Federal Aviation Administration (FAA) flight plan had been filed for the flight. The local flight originated about 1845. According to the pilot, he was landing on runway 33, at the ultralight airfield. After the airplane touched down the left main landing gear collapsed at the bottom end of the strut. The airplane ground looped, and the right wingtip struck the ground resulting in substantial damage to the wing rib. The pilot stated that the landing was smooth and gentle, not hard, and there was no side load on the landing gear at touchdown. He suspected that a previous landing may have been hard resulting in a crack in the landing gear. An examination of the left main landing gear revealed that the upper/outer strut tubing was broken, and the lower/inner strut tubing was bent. There was no evidence of fatigue. An examination of the airplane and related systems, conducted by a National Transportation Safety Board Investigator and FAA inspectors, revealed no anomalies that would have precluded normal operation. ## Aircraft - Registration: [N677TS](https://openairdocs.org/aircraft/N677TS), registered now, S/N 021, built 2016 (OpenAirDocs) - Reported make and model: Fisher DAKATO HAWK - Registry model: [Makepeace Mike DAKATO HAWK](https://openairdocs.org/model/makepeace-mike-dakato-hawk) (registry code 05634ZF) (OpenAirDocs) - Registry engine: [Rotax 912 series](https://openairdocs.org/engine/rotax-912-series) (registry code 55569, 4 cycle) (OpenAirDocs) - Category: Airplane, amateur-built - Serial number: 021 - Year built: 2016 - Engines: Rotax 912 UL 80 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Airworthiness certificate: Special, Experimental (Special) - Last inspection: Condition, August 11, 2017, 78 hours before - Departed: OSH, Oshkosh, WI - Destination: OSH, Oshkosh, WI - Airport: OSH, Wittman Rgnl, runway 33, 1,200 × 25 ft, grass/turf - Equipment: None ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 71; injuries: none; private; airplane ratings: single-engine land; medical: basicmed, without waivers/limitations; last flight review June 26, 2018; seat: left; restraint: 3-point; flight hours: 1,097 total, 10 in this make and model, 10 in the last 90 days, 10 in the last 30 days, 3.5 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 270° at 8 knots - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 70 °F, dew point 57 °F - Altimeter: 29.90 inHg - Observed at: KOSH, 1 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 20180726018019A](https://openairdocs.org/incident/20180726018019A), Jul 26, 2018: Makepeace Mike DAKATO HAWK, Oshkosh, WI, Substantial damage. On July 26th at approximately 1855 local time during eaa airventure 2018, N677TS was approaching to land runway 33 at the ultralight landing strip on the south… ## Docket (2 files) The files NTSB released with the investigation on August 29, 2018, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=97897. 3.8 MB in all. - Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1 (item 1, .PDF, 3.5 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40466194&FileExtension=.PDF&FileName=Pilot%2FOperator%20Aircraft%20Accident%20Report,%20NTSB%20Form%206120.1-Master.PDF - Accident Report Photographs (item 2, .PDF, 3 photos, 311 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40466195&FileExtension=.PDF&FileName=Accident%20Report%20Photographs-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.