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June 23, 2021 · Vining SD1 Minisport · N72DX

Butler, OH

Overview

Report Status
Final with probable cause
Event Type
Accident
Date
June 23, 2021
Injury Outcomes
No injuries (1 uninjured)
Location
Butler, OH
Aircraft
Vining SD1 Minisport (2017)
Tail Number
N72DX
Injuries
None
Aircraft Damage
Substantial
NTSB Number
CEN21LA288

A line of trees paralleled the runway on the southwest side, and a cornfield was on the northeast side. As the pilot taxied to the end of runway 13, he noted a significant crosswind from over the tree line. After a normal runup, he increased to full power. Immediately after the airplane lifted off the ground, it drifted to the right over the cornfield. The airplane “seemed to have too little power to climb” and the airplane stalled, touching down in the field. The left main landing gear separated, and the airplane spun to a stop. A postaccident examination of the engine revealed a crack in the pressure vacuum line; however, it could not be determined whether the crack could have caused a reduction in engine power. The circumstances of the accident are consistent with the pilot’s failure to maintain adequate airspeed following a partial loss of engine power during takeoff, which resulted in an aerodynamic stall.

NTSB Probable Cause

The pilot’s failure to maintain adequate airspeed following a partial loss of engine power, which resulted in an aerodynamic stall and impact with terrain. The reason for the partial loss of engine power could not be determined based on available information.

Full Narrative

On June 23, 2021, at 1015 eastern daylight time, an experimental amateur-built SD-1 Minisport airplane, N72DX, was substantially damaged when it was involved in an accident at Freeman Swank Farms Airport (0OH5), Butler, Ohio. The pilot was not injured. The airplane was operated as a Title 14 Code of Federal Regulations Part 91 personal flight. A line of trees paralleled the runway on the southwest side of the runway, and a cornfield was on the northeast side. As the pilot taxied to the end of runway 13, he noted a significant crosswind from over the tree line. After a normal runup, he increased the engine to full power. Immediately after the airplane lifted off the ground it drifted to the right over the cornfield. The airplane “seemed to have too little power to climb” and it stalled, touching down in the field. The left main landing gear separated, and the airplane spun to a stop. The airplane’s left-wing spar was substantially damaged. The fuel tank remained intact and about 7-8 gallons remained inside. The spark plugs were removed from the engine and were consistent with normal operations. The engine rotated without binding, and thumb compression was established on all cylinders. A boroscope was used to examine the inside of the cylinders; the piston heads and cylinder walls exhibited normal operating wear signatures. The pressure vacuum line exhibited a crack near where it connects to the engine. The crack was not visible until the protective sleeve was removed from the line. The nearest weather reporting facility was located about 14 miles north of the accident airport. At 0952, wind was reported from 220° at 6 knots. At 1100, the National Weather Service Surface Analysis Chart depicted southwest winds at 5 to 10 knots.

Flight

Event TypeAccident
Event Time10:15 EDT
Nearest AirportFreeman Swank Farms Airport (1nm)
Runway13
Runway Length3002 ft
Runway Width100 ft
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo

Aircraft

AircraftVining SD1 Minisport
Tail NumberN72DX
Aircraft CategoryAir
DamageSubstantial
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsHirth · F23 · Reciprocating · 50
Seats1

People & Injuries

Injury SummaryNo injuries (1 uninjured)
Fatal0
Serious0
Minor0
Uninjured1
Total1
Crew 1Age 67 · Sprt · None

Conditions

ConditionsVMC
LightDaylight
Wind220° @ 6 kt
Visibility10 sm
CeilingNone
Temperature / Dew Point68 F / 45 C
Altimeter30.20 inHg
Observation Time09:52
Weather SourceWFAC

Appendix: Source Data