# NTSB CHI66A0011: Boeing IB75A, N53234, Valparaiso, IN, July 23, 1966

- Type: NTSB accident investigation
- Classification: Accident · Fatal · Closed
- Date: July 23, 1966
- Place: Valparaiso, IN · VALPARAISO, IN
- Location: 41.4798° N, 87.0523° W: Placed by OpenAirDocs: center of Valparaiso, IN, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=41.4798&lon=-87.0523&mi=10
- Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping)
- Highest injury: Fatal
- Injuries: 1 fatal
- Status: Completed, report February 28, 1967
- Report: Brief approved by the director
- NTSB case key (mKey): 122378
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI66A0011
- Page: https://openairdocs.org/ntsb/CHI66A0011-122378

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
2-0629  66/7/23    VALPARAISO IND      BOEING IB75A        CR-  1  0  0  MISCELLANEOUS             COMMERCIAL, AGE 40, 6000
        TIME - 1510                    N53234              PX-  0  0  0  AIR SHOW/RACING           TOTAL HOURS, UNK/NR IN
                                       DAMAGE-DESTROYED    OT-  0  0  0                            TYPE, NOT INSTRUMENT
                                                                                                   RATED.
        NAME OF AIRPORT - PORTER COUNTY
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           ENGINE FAILURE OR MALFUNCTION                            IN FLIGHT: ACROBATICS
           COLLISION WITH GROUND/WATER: UNCONTROLLED                IN FLIGHT: UNCONTROLLED DESCENT
        PROBABLE CAUSE(S)
           POWERPLANT - ENGINE STRUCTURE: CRANKSHAFT
           MISCELLANEOUS ACTS,CONDITIONS - FATIGUE FRACTURE
           POWERPLANT - PROPELLER AND ACCESSORIES: OTHER
           AIRFRAME - WINGS: BRACING WIRES,STRUTS
           AIRFRAME - FLIGHT CONTROL SURFACES: AILERON SURFACES,ATTACHMENTS
        FACTOR(S)
           MISCELLANEOUS ACTS,CONDITIONS - SEPARATION IN FLIGHT
        COMPLETE POWER LOSS - COMPLETE ENGINE FAILURE/FLAMEOUT-1 ENGINE
         FIRE AFTER IMPACT
        REMARKS- PROP SHAFT SEPARATED AT THRUST NUT THREADS.PROP. HIT L WG BRACE,L WGS FOLDED.AD57-5-4 NOT INCORP.
```

## Aircraft

- Registration: [N53234](https://openairdocs.org/deregistered/N53234-1971-11-02), registration cancelled 1971-11-02, S/N 753761 (OpenAirDocs)
- Reported make and model: BOEING IB75A
- Registry model: [Boeing IB75A](https://openairdocs.org/model/boeing-ib75a) (registry code 1380152) (OpenAirDocs)
- Category: Airplane
- Engines: reciprocating
- Damage: Destroyed
- Airport: Porter County

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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