# NTSB CHI72FEE29: Knight OW-1, N1013Z, Maple Park, IL, October 4, 1971

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: October 4, 1971
- Place: Maple Park, IL · MAPLE PARK, IL
- Location: 41.9108° N, 88.6061° W: Placed by OpenAirDocs: center of Maple Park, IL, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=41.9108&lon=-88.6061&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report February 4, 1972
- Report: Brief approved by the director
- NTSB case key (mKey): 163529
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI72FEE29
- Page: https://openairdocs.org/ntsb/CHI72FEE29

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-1948   71/10/4   MAPLE PARK,ILL      KNIGHT OW-1         CR-  0  0  1  NONCOMMERCIAL             PRIVATE, AGE 33, 279
        TIME - 1630                    N1013Z              PX-  0  0  0  PLEASURE/PERSONAL TRANSP  TOTAL HOURS, 45 IN TYPE,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            NOT INSTRUMENT RATED.
        NAME OF AIRPORT - HEUER RLA
        DEPARTURE POINT             INTENDED DESTINATION
          WAUKEGAN,ILL                MAPLE PARK,ILL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           GEAR COLLAPSED                                           LANDING: ROLL
        PROBABLE CAUSE(S)
           AIRFRAME - LANDING GEAR: MAIN GEAR-SHOCK ABSORBING ASSY,STRUTS,ATTACHMENTS,ETC.
           MISCELLANEOUS ACTS,CONDITIONS - MATERIAL FAILURE
           PERSONNEL - PRODUCTION-DESIGN-PERSONNEL: POOR/INADEQUATE DESIGN
        REMARKS- L GR FAILED. PLT MODIFIED GR 45 HRS PRIOR DUE LARGER ENG INSTALL.GR OF INSUFFICIENT STRENGTH.
```

## Aircraft

- Registration: [N1013Z](https://openairdocs.org/deregistered/N1013Z-1972-11-15), registration cancelled 1972-11-15, S/N OW-1 (OpenAirDocs)
- Reported make and model: KNIGHT OW-1
- Registry model: [Knight Twister OW-1](https://openairdocs.org/model/knight-twister-ow-1) (registry code 4970138) (OpenAirDocs)
- Category: Airplane, amateur-built
- Engines: reciprocating
- Damage: Substantial damage
- Airport: Heuer Rla

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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