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CEN23FA320 · Heath V-Strut

25 Jul 2023 · Oshkosh, WI, United States

Heath V-Strut · Accident: loss of control in flight during initial climb

From Wittman Regional Airport (KOSH) to an unrecorded destination

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Event

NTSB case
CEN23FA320
Event typeAccident: someone killed or seriously injured, or the aircraft substantially damaged (NTSB definition). Incident: an occurrence that affected or could have affected safety, short of that. Glossary
Accident
InvestigationHow far the investigation had got when the record was published: preliminary, ongoing, final or completed. Unknown where the source does not say. Glossary
Completed
API-reported fatalities
0 · all aircraft and ground
Ground fatalities
0
OperationWhat kind of flying it was, grouped by the rules it flew under: airline (US Part 121), air taxi and commuter (Part 135), general aviation (Part 91 and similar), military or government. Glossary
General aviation
WeatherVisual meteorological conditions (VMC): good enough to fly by looking outside. Instrument conditions (IMC): cloud or low visibility, flying by instruments. Glossary
Visual Meteorological Cond

Heath V-Strut

Aircraft type
Heath V-STRUT
Category
Airplane
RegistrationThe aircraft's tail number, such as N12345 or G-ABCD. Registrations are reissued, so the same one years apart can be a different aircraft. Glossary
N9549
Operator
Unknown
Onboard fatalities
Unknown
Route
From Wittman Regional Airport (KOSH), Oshkosh, WITo not recorded
Aircraft age
About 21 years (built 2002)
Flight rulesThe regulations the flight operated under: in the US, Part 91 (general aviation), Part 121 (airlines), Part 135 (air taxi and commuter) and others; for flights abroad, the NTSB's coarser commercial or non-commercial code. Glossary
Part 91: General Aviation
Phase of flightThe stage of the flight when things started to go wrong: standing, taxi, takeoff, initial climb, en route, maneuvering, approach or landing. Glossary
Initial climb
Defining eventThe single coded event the NTSB judges best describes what happened (records from 2008 on). Older records name the first occurrence in the sequence instead. Glossary
Loss of control in flight
DamageDestroyed: beyond practical repair. Substantial: damage that affects the structure, performance or handling and normally needs major repair. Minor: less than that. Glossary
Substantial

Cause areas

  • Aircraft › Aircraft oper/perf/capability
  • Personnel issues › Task performance

Approximate · Coordinates as recorded by the NTSB; no uncertainty radius is established.

NTSB narrative

Shortly after takeoff the pilot turned the airplane to avoid flying over the perpendicular runway. He reported that during the turn the airplane stopped climbing. The pilot aimed the airplane toward a field and attempted a forced landing. During the landing the airplane came to rest inverted, which resulted in substantial damage to the fuselage, empennage, and both wings. One witness stated that the airplane “looked sluggish,” with the nose of the airplane high. Several witnesses observed the left wing dip before the airplane descended below the tree line. Security video showed the left wing dropped and the airplane impacted the ground in a left-wing-low attitude. A postaccident examination of the engine, flight controls, and related systems revealed no mechanical failures or malfunctions that would have precluded normal operations. The splintered damage to the propeller blade was consistent with power and rotation at the time of impact. The pilot also reported that there was nothing mechanically wrong with the airplane at the time of the accident. Weather conditions at the time of the accident were conducive for serious icing at glide power. However, investigators were not able to determine if a partial loss of engine power due to the accumulation of carburetor icing during the ground taxi may have resulted in the loss of climb performance after takeoff. Given the witness description and the footage captured by the security camera, it is likely that the pilot failed to maintain adequate airspeed during the initial climb and turn, which resulted in the exceedance of the airplane’s critical angle of attack and an aerodynamic stall and a subsequent loss of control.

Probable cause

The pilot’s failure to maintain adequate airspeed and his exceedance of the airplane’s critical angle of attack, which resulted in an aerodynamic stall.

Verbatim NTSB analysis and probable cause from the NTSB dataset

Sources

NTSB record CEN23FA320
Event ID
20230725192700
Case number
CEN23FA320
Dataset
full-current
Source SHA-256
5cf380f0061817c0331a6b2d8cc7e0ee3a79bea469a1001dc5c10e56f35f5ab3
Source notes (4)
  • Unreviewed is an editorial label, not an investigation status. API-sourced is not report-checked or human-reviewed. Explicit event totals are used without summing aircraft injury tables; onboard allocation is withheld. Unknown values remain unknown. The operation category is mapped from the NTSB-reported FAR part and has not been reviewed.
  • Filled from the NTSB case API where the bulk record had no value: investigation status, cause areas. Values present in the bulk record are kept.
  • The date is the local date, which is the same as the UTC date the NTSB stores.
  • API snapshot SHA-256: 0e855d4428fbf70ff2f263031ccd04b9926096d3f01623b0e3e3929f0d3cebc3; retrieved 2026-09-16T17:54:00.319Z.