Tuesday, May 28, 2019

Landing Gear Collapse: Fisher Dakota Hawk, N677TS; accident occurred July 26, 2018 at Wittman Regional Airport (KOSH), Oshkosh, Winnebago County, Wisconsin

The National Transportation Safety Board did not travel to the scene of this accident.

Additional Participating Entity:

Federal Aviation Administration / Flight Standards District Office; Milwaukee, Wisconsin

Aviation Accident Factual Report - National Transportation Safety Board: https://app.ntsb.gov/pdf

Investigation Docket - National Transportation Safety Board: https://dms.ntsb.gov/pubdms


Location: Oshkosh, WI
Accident Number: CEN18TA296
Date & Time: 07/26/2018, 1855 CDT
Registration: N677TS
Aircraft: Fisher DAKATO HAWK
Aircraft Damage: Substantial
Defining Event: Landing gear collapse
Injuries: 2 None
Flight Conducted Under: Part 91: General Aviation - Personal 

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.

Pilot Information

Certificate: Private
Age: 71, Male
Airplane Rating(s): Single-engine Land
Seat Occupied: Left
Other Aircraft Rating(s): None
Restraint Used: 3-point
Instrument Rating(s): None
Second Pilot Present: No
Instructor Rating(s): None
Toxicology Performed: No
Medical Certification: BasicMed Without Waivers/Limitations
Last FAA Medical Exam: 06/28/2018
Occupational Pilot: No
Last Flight Review or Equivalent: 06/26/2018
Flight Time:  1097.1 hours (Total, all aircraft), 10 hours (Total, this make and model), 10 hours (Last 90 days, all aircraft), 10 hours (Last 30 days, all aircraft), 3.5 hours (Last 24 hours, all aircraft)

Aircraft and Owner/Operator Information

Aircraft Make: Fisher
Registration: N677TS
Model/Series: DAKATO HAWK
Aircraft Category: Airplane
Year of Manufacture: 2016
Amateur Built: Yes
Airworthiness Certificate: Experimental
Serial Number: 021
Landing Gear Type: Tailwheel
Seats: 2
Date/Type of Last Inspection: 08/11/2017, Condition
Certified Max Gross Wt.: 1272 lbs
Time Since Last Inspection: 78 Hours
Engines: 1 Reciprocating
Airframe Total Time:  at time of accident
Engine Manufacturer: Rotax
ELT: Installed, not activated
Engine Model/Series: 912 UL
Registered Owner: On file
Rated Power: 80 hp
Operator: On file
Operating Certificate(s) Held: None

Meteorological Information and Flight Plan

Conditions at Accident Site: Visual Conditions
Condition of Light: Day
Observation Facility, Elevation: KOSH, 808 ft msl
Distance from Accident Site: 1 Nautical Miles
Observation Time: 2353 UTC
Direction from Accident Site: 180°
Lowest Cloud Condition: Few / 6500 ft agl
Visibility:  10 Miles
Lowest Ceiling: None
Visibility (RVR):
Wind Speed/Gusts: 8 knots /
Turbulence Type Forecast/Actual: None / None
Wind Direction: 270°
Turbulence Severity Forecast/Actual: N/A / N/A
Altimeter Setting: 29.91 inches Hg
Temperature/Dew Point: 21°C / 14°C
Precipitation and Obscuration: No Obscuration; No Precipitation
Departure Point: Oshkosh, WI (OSH)
Type of Flight Plan Filed: None
Destination: Oshkosh, WI (OSH)
Type of Clearance: None
Departure Time: 1845 CDT
Type of Airspace: Class D

Airport Information

Airport: Wittman Rgnl (OSH)
Runway Surface Type: Grass/turf
Airport Elevation: 808 ft
Runway Surface Condition: Dry; Vegetation
Runway Used: 33
IFR Approach: None
Runway Length/Width: 1200 ft / 25 ft
VFR Approach/Landing: Full Stop

Wreckage and Impact Information

Crew Injuries: 1 None
Aircraft Damage: Substantial
Passenger Injuries: 1 None
Aircraft Fire: None
Ground Injuries: N/A
Aircraft Explosion: None
Total Injuries: 2 None
Latitude, Longitude:  43.969722, -88.567778 (est)

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