# NTSB CHI75FEP11: Thorpe T-18, N193N, Oshkosh, WI, August 6, 1974

- Type: NTSB accident investigation
- Classification: Accident · Fatal · Closed
- Date: August 6, 1974
- Place: Oshkosh, WI · OSHKOSH, WI
- Location: 44.0232° N, 88.5623° W: Placed by OpenAirDocs: center of Oshkosh, WI, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=44.0232&lon=-88.5623&mi=10
- Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping)
- Highest injury: Fatal
- Injuries: 2 fatal
- Status: Completed, report December 9, 1974
- Report: Brief approved by the director
- NTSB case key (mKey): 138743
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI75FEP11
- Page: https://openairdocs.org/ntsb/CHI75FEP11

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-3470   74/8/6    OSHKOSH,WIS         THORPE T-18         CR-  1  0  0  NONCOMMERCIAL             PRIVATE, AGE 42, 4000
        TIME - 1025                    N193N               PX-  1  0  0  PLEASURE/PERSONAL TRANSP  TOTAL HOURS, 320 IN TYPE,
                                       DAMAGE-DESTROYED    OT-  0  0  0                            NOT INSTRUMENT RATED.
        NAME OF AIRPORT - WITTMAN
        DEPARTURE POINT             INTENDED DESTINATION
          OSHKOSH,WIS                 LOCAL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           AIRFRAME FAILURE: IN FLIGHT                              IN FLIGHT: LOW PASS
        PROBABLE CAUSE(S)
           PERSONNEL - PRODUCTION-DESIGN-PERSONNEL: OTHER
           AIRFRAME - WINGS: WING ATTACHMENT FITTINGS,BOLTS
           MISCELLANEOUS ACTS,CONDITIONS - WRONG PART
           MISCELLANEOUS ACTS,CONDITIONS - MATERIAL FAILURE
        FACTOR(S)
           MISCELLANEOUS ACTS,CONDITIONS - SEPARATION IN FLIGHT
         FIRE AFTER IMPACT
        REMARKS- WRONG SIZE RIVETS INSTALLED.WING PANEL SEPARATED.
```

## Aircraft

- Registration: [N193N](https://openairdocs.org/deregistered/N193N-1974-11-08), registration cancelled 1974-11-08, S/N 115 (OpenAirDocs)
- Reported make and model: THORPE T-18
- Registry model: [Albert Neunteufel THORP T-18](https://openairdocs.org/model/albert-neunteufel-thorp-t-18) (registry code 89510MA) (OpenAirDocs)
- Category: Airplane, amateur-built
- Engines: reciprocating
- Damage: Destroyed
- Airport: Wittman

## 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 19740806032009A](https://openairdocs.org/incident/19740806032009A), Aug 6, 1974: Amtr 8951041, Oshkosh, WI, Destroyed, 1 fatal. Wrong size rivets installed. Wing panel separated.

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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