CEN18CA293

NTSB accident investigation · Just JA30 Superstol · Oshkosh, WI · July 24, 2018

Accident · Minor injuriesData collectionFinal report
Date
July 24, 2018, 10:03 local (15:03 UTC)
Place
Oshkosh, WI
Injuries
2 minor
Damage
Substantial damage
Phase of flight
Takeoff
Aircraft
N45FTJust JA30 Superstol
Defining event
Takeoff: Loss of control in flight
Weather
Visual (VMC) · Day
Status
Completed · report March 18, 2019
Report
Approved by Office Director
NTSB office
Central Region
Parties
Federal Aviation Administration
FAA report
20180724017839A
Case key
97871

From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.

On this page

Probable cause

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.

Findings · 5

NTSB’s coded findings. Those marked are part of the probable cause; the rest are factors or other findings. Under each, the cases with the same finding.

Performance/control parameters: airspeedAircraft › Aircraft oper/perf/capability · Not attained/maintainedBenjamin R Schneider JA30 SUPERSTOL: 1 caseAll aircraft: 1,681 casesProbable cause
Performance/control parameters: angle of attackAircraft › Aircraft oper/perf/capability · Not attained/maintainedBenjamin R Schneider JA30 SUPERSTOL: 1 caseAll aircraft: 990 casesProbable cause
Terrain: sloped/uneven terrainEnvironmental issues › Physical environment · Contributed to outcomeBenjamin R Schneider JA30 SUPERSTOL: 1 caseAll aircraft: 270 cases

Sequence of events

The events NTSB coded, in order, by phase of flight. The defining event is the one that best describes the accident. Under each, the cases with the same event anywhere in their sequence.

Analysis

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.

Factual narrative

The private pilot stated that, during the initial climb after takeoff, after "leveling out" and seeing an increase in airspeed, "the [flight] control got mushy, and the airplane began to sink slightly." 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 nose forward and retracted the flaps. The airplane descended and hit a ditch and gravel road before coming to rest adjacent a chain-linked-fence. Both wings were bent down and partially separated, both main landing gear collapsed, and the fuselage was impact damaged. The pilot stated that there were no mechanical failures or malfunctions of the airplane. A video of the accident corroborated the pilot's statement. An examination of the airplane, conducted by the National Transportation Safety Board investigator in charge and Federal Aviation Administration inspectors, revealed no mechanical anomalies that would have precluded normal operations.

Aircraft

Registration
N45FT
Reported as
Just JA30 Superstol
Category
Airplane, amateur-built
Serial number
JA263-03-12
Built
2015
Airframe hours
103
Engine
Rotax 912UL, 100 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Airworthiness certificate
Special, Experimental (Special)
Last inspection
Condition · February 2, 2018
Departed
OSH · Oshkosh, WI
Destination
OSH · Oshkosh, WI
Airport
OSH · Wittman Rgnl
Equipment
Electronic primary flight display, Handheld GPS

Matched to the registry by N-number and the event date; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.

Flight crew

As NTSB recorded them. NTSB leaves out names.

Role
Pilot
Age
42
Injuries
Minor
Certificate
Private
Airplane ratings
Single-engine land
Medical
Class 3, Without waivers/limitations
Last flight review
June 25, 2018
Seat
Left
Restraint
4-point
Flight hours
319 total · 113.1 in this make and model · 253.3 as pilot in command · 15.3 in the last 90 days · 6.9 in the last 30 days · 0.4 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Visibility
7 statute miles
Lowest ceiling
None
Temperature
73 °F, dew point 68 °F
Altimeter
30.01 inHg
Observed at
KOSH, 1 nm away

Docket · 2

The files NTSB released with the investigation on August 23, 2018, on NTSB’s docket system: statements, records, photos and specialists’ reports. 1.1 MB in all.

FAA reports on this event · 1

The FAA’s own accident and incident reports, matched to the aircraft by N-number and date.