Tuesday, July 23, 2019

Loss of Control in Flight: Just JA30 Superstol, N45FT; accident occurred July 24, 2018 at Wittman Regional Airport (KOSH), Oshkosh, Winnebago County, Wisconsin

Additional Participating Entity:
Federal Aviation Administration / Flight Standards District Office; Milwaukee, Wisconsin

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

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

Aviation Accident Data Summary - National Transportation Safety Board:  https://app.ntsb.gov/pdf


Location: Oshkosh, WI
Accident Number: CEN18CA293
Date & Time: 07/24/2018, 1003 CDT
Registration: N45FT
Aircraft: Just JA30 SUPERSTOL
Aircraft Damage: Substantial
Defining Event: Loss of control in flight
Injuries: 2 Minor
Flight Conducted Under: Part 91: General Aviation - Personal


The private pilot stated that, during the initial climb after takeoff, the flight controls got mushy, and the airplane began to sink. The pilot added flaps and verified engine throttle position; however, the airplane continued to sink, and the flight controls continued to feel mushy. The pilot pushed the airplane's nose forward and retracted the flaps. The airplane descended and hit a ditch and gravel road before coming to rest adjacent to a chain-link fence.

Examination of the airplane and related systems revealed no preimpact mechanical anomalies that would have precluded normal operation. The pilot's statement, along with the video of the accident, revealed that the ;ilot did not maintain an adequate airspeed during the initial climb and should have climbed more shallowly. Due to the low airspeed and his exceedance of the airplane's critical angle of attack, the airplane aerodynamically stalled.

Probable Cause and Findings

The National Transportation Safety Board determines the probable cause(s) of this accident to be:
The pilot's failure to maintain adequate airspeed during the initial climb and his exceedance of the airplane's critical angle of attack, which resulted in an aerodynamic stall.


Airspeed - Not attained/maintained (Cause)
Angle of attack - Not attained/maintained (Cause)

Personnel issues
Aircraft control - Pilot (Cause)

Environmental issues
Fence/fence post - Contributed to outcome
Sloped/uneven terrain - Contributed to outcome

Factual Information

History of Flight

Loss of control in flight (Defining event)
Attempted remediation/recovery

Uncontrolled descent
Collision with terr/obj (non-CFIT)

Pilot Information

Certificate: Private
Age: 42, Male
Airplane Rating(s): Single-engine Land
Seat Occupied: Left
Other Aircraft Rating(s): None
Restraint Used: 4-point
Instrument Rating(s): None
Second Pilot Present: No
Instructor Rating(s): None
Toxicology Performed: No
Medical Certification: Class 3 Without Waivers/Limitations
Last FAA Medical Exam: 09/01/2017
Occupational Pilot: No
Last Flight Review or Equivalent: 06/25/2018
Flight Time:  319 hours (Total, all aircraft), 113.2 hours (Total, this make and model), 253.3 hours (Pilot In Command, all aircraft), 15.4 hours (Last 90 days, all aircraft), 6.9 hours (Last 30 days, all aircraft), 0.4 hours (Last 24 hours, all aircraft)

Aircraft and Owner/Operator Information

Aircraft Make: Just
Registration: N45FT
Model/Series: JA30 SUPERSTOL
Aircraft Category: Airplane
Year of Manufacture: 2015
Amateur Built: Yes
Airworthiness Certificate: Experimental
Serial Number: JA263-03-12
Landing Gear Type: Tailwheel
Seats: 2
Date/Type of Last Inspection: 02/02/2018, Condition
Certified Max Gross Wt.: 1320 lbs
Time Since Last Inspection:
Engines: 1 Reciprocating
Airframe Total Time: 103 Hours at time of accident
Engine Manufacturer: Rotax
ELT: C126 installed, not activated
Engine Model/Series: 912UL
Registered Owner: On file
Rated Power: 100 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: 1453 UTC
Direction from Accident Site: 180°
Lowest Cloud Condition: Clear
Visibility: 7 Miles
Lowest Ceiling: None
Visibility (RVR):
Wind Speed/Gusts: Light and Variable /
Turbulence Type Forecast/Actual: None / None
Wind Direction: Variable
Turbulence Severity Forecast/Actual: N/A / N/A
Altimeter Setting: 30.01 inches Hg
Temperature/Dew Point: 23°C / 20°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: 1003 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: N/A
IFR Approach: None
Runway Length/Width:
VFR Approach/Landing: None

Wreckage and Impact Information

Crew Injuries: 1 Minor
Aircraft Damage: Substantial
Passenger Injuries: 1 Minor
Aircraft Fire: None
Ground Injuries: N/A
Aircraft Explosion: None
Total Injuries: 2 Minor
Latitude, Longitude: 43.969722, -88.562778 (est)

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