# NTSB CHI90FA212: Boeing A75N1, N25400, Oshkosh, WI, August 2, 1990

- Type: NTSB accident investigation
- Classification: Accident · Fatal · Field investigation · Final report
- Date: August 2, 1990, 16:42 local (21:42 UTC)
- Place: Oshkosh, WI
- Location: 43.9844° N, 88.5570° W: Placed by OpenAirDocs at WITTMAN RGNL (OSH), within about a mile (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=43.9844&lon=-88.5570&mi=10
- Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping)
- Highest injury: Fatal
- Injuries: 1 fatal
- Status: Completed, report November 9, 1992
- Report: Approved by Office Director
- NTSB case key (mKey): 14544
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI90FA212
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/14544/pdf
- Page: https://openairdocs.org/ntsb/CHI90FA212

## Probable cause

THE PILOT-IN-COMMAND'S FAILURE TO MAINTAIN AIRSPEED SUFFICIENT TO AVOID A STALL/SPIN AT AN ALTITUDE INSUFFICIENT TO EFFECT A FULL RECOVERY.

## Sequence of events

In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf).

- Loss of control - in flight, maneuvering
  - aerobatics - intentional, pilot in command (contributing factor)
  - airspeed - not maintained, pilot in command (cause)
  - stall - inattentive, pilot in command (cause)
- In flight collision with terrain/water, descent - uncontrolled
  - terrain condition - grass

## Analysis

THE AIRCRAFT WAS ENGAGED IN PERFORMING AEROBATIC MANEUVERS IN CONNECTION WITH THE EXPERIMENTAL AIRCRAFT ASSOCIATIONS CONVENTION. THE AIRCRAFT ENTERED A SLOW ROLL TO THE LEFT. AT APPROXIMATELY THE INVERTED POSITION, THE AIRCRAFT DEPARTED CONTROLLED FLIGHT, ENTERED AN UNCOMMANDED SNAP ROLL (STALL/SPIN), TO THE LEFT. THE AIRCRAFT COMPLETED THREE-QUARTERS OF THE ROLL, STOPPED IN KNIFE-EDGE FLIGHT AND DESCENDED APPROXIMATELY 200 TO 300 FEET INTO THE TERRAIN.

## Aircraft

- Registration: [N25400](https://openairdocs.org/deregistered/N25400-2012-09-12), registration cancelled 2012-09-12, S/N 75-2901 (OpenAirDocs)
- Reported make and model: BOEING A75N1
- Registry model: [Boeing A75N1(PT17)](https://openairdocs.org/model/boeing-a75n1-pt17) (registry code 1380134) (OpenAirDocs)
- Registry engine: [Continental R670-SERIES series](https://openairdocs.org/engine/continental-r670-series-series) (registry code 17016, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 75-2901
- Engines: CONTINENTAL W-670-16 220 horsepower reciprocating
- Damage: Destroyed
- Flight: Part 91
- Operator: Lewkowicz, John D.
- Registered owner: Lewkowicz, John D
- Airport: OSH, Wittman Field

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 47; commercial; airplane ratings: single-engine sea, multi-engine land, multi-engine sea, single-engine land; instrument ratings: airplane; medical: class 2, valid medical--w/ waivers/lim; toxicology performed; flight hours: 2,000 total

## Weather

- Conditions: Visual (VMC), Day
- Wind: 210° at 10 knots
- Visibility: 15 statute miles
- Lowest ceiling: none
- Temperature: -0 °F, dew point -0 °F
- Observed at: OSH, 1 nm away

## FAA reports on this event (1)

The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs).

- [Accident 19900802029519A](https://openairdocs.org/incident/19900802029519A), Aug 2, 1990: Boeing A75N1, Oshkosh, WI, Destroyed, 1 fatal. Lost control during a low level roll and crashed. Was per forming acrobatics for the Oshkosh eaa fly in.

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

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