# NTSB CHI93LA293: Aeronca 7AC, N81598, Oshkosh, WI, July 28, 1993

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: July 28, 1993, 10:30 local (15:30 UTC)
- Place: Oshkosh, WI
- Coordinates: 44.059158, -88.540702 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=44.0592&lon=-88.5407&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report December 3, 1993
- Report: Approved by Office Director
- NTSB case key (mKey): 15765
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI93LA293
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/15765/pdf
- Page: https://openairdocs.org/ntsb/CHI93LA293

## Probable cause

THE PILOT-IN-COMMAND'S NOT MAINTAINING DIRECTIONAL CONTROL.  FACTORS INCLUDE A CROSSWIND, THE PILOT-IN-COMMAND'S NOT ATTAINING COMPENSATION FOR WIND CONDITIONS, AND HIS LACK OF EXPERIENCE IN THIS TYPE OF AIRPLANE.

## Sequence of events

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

- Loss of control - on ground/water, landing - roll
  - weather condition - crosswind (contributing factor)
  - directional control - not maintained, pilot in command (cause)
  - lack of total experience in type of aircraft, pilot in command (contributing factor)
  - compensation for wind conditions - not attained, pilot in command (contributing factor)
  - ground loop/swerve - inadvertent, pilot in command
- On ground/water encounter with terrain/water, landing - roll

## Analysis

THE PRIVATE PILOT HAD ACCUMULATED FOURTEEN HOURS IN THIS TYPE OF AIRPLANE, WITH SEVEN HOURS AS PILOT-IN-COMMAND AND FOUR HOURS ON THE DAY OF THE ACCIDENT.  HE ATTEMPTED TO LAND THE TAILWHEEL AIRPLANE ON RUNWAY 18. PREVAILING WINDS WERE REPORTED AS 270 DEGREES AT 12 KNOTS.  THE AIRPLANE GROUND LOOPED AND EXITED THE RUNWAY.

## Aircraft

- Registration: [N81598](https://openairdocs.org/aircraft/N81598), registered now, S/N 7AC-217, built 1945 (OpenAirDocs)
- Reported make and model: AERONCA 7AC
- Registry model: [Aeronca 7AC](https://openairdocs.org/model/aeronca-7ac) (registry code 2110102) (OpenAirDocs)
- Registry engine: [Continental A&C65 series](https://openairdocs.org/engine/continental-a-c65-series) (registry code 17003, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 7AC-217
- Engines: CONTINENTAL A-65-8 65 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Operator: Seifert, Robert
- Registered owner: Seifert, Robert
- Airworthiness certificate: Standard, Normal
- Last inspection: Annual, January 2, 2000
- Departed: Y50, WAUTOMA, WI
- Airport: OSH, Wittman Airport, runway 18, 8,001 × 150 ft, concrete

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 18; private; airplane ratings: single-engine land; medical: class 3, valid medical--w/ waivers/lim; seat: front; flight hours: 83 total, 14 in this make and model, 27 as pilot in command, 27 in the last 90 days, 13 in the last 30 days, 4 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 270° at 12 knots
- Visibility: 15 statute miles
- Lowest ceiling: none
- Altimeter: 29.00 inHg
- 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 19930728025959A](https://openairdocs.org/incident/19930728025959A), Jul 28, 1993: Bbavia 7AC, Oshkosh, WI, Substantial damage. Lost control landing in crosswind. Ran off runway and ground looped.

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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