# NTSB CHI66F0726: Piper PA-23, N1247P, West Chicago, IL, May 5, 1966

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: May 5, 1966
- Place: West Chicago, IL · WEST CHICAGO, IL
- Location: 41.8953° N, 88.2205° W: Placed by OpenAirDocs: center of West Chicago, IL, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=41.8953&lon=-88.2205&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report August 22, 1966
- Report: Brief approved by the director
- NTSB case key (mKey): 171821
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI66F0726
- Page: https://openairdocs.org/ntsb/CHI66F0726

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-1689   66/5/5    WEST CHICAGO ILL    PIPER PA-23         CR-  0  0  2  INSTRUCTIONAL             AIRLINE TRANSPORT, AGE
        TIME - 1844                    N1247P              PX-  0  0  0  DUAL                      38, 8797 TOTAL HOURS, 492
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            IN TYPE, NOT INSTRUMENT
                                                                                                   RATED.
        NAME OF AIRPORT - DU PAGE COUNTY
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           GEAR COLLAPSED                                           LANDING: ROLL
        PROBABLE CAUSE(S)
           SYSTEMS - HYDRAULIC SYSTEM: RELIEF VALVE
           MISCELLANEOUS - FOREIGN MATERIAL AFFECTING NORMAL OPERATIONS
        REMARKS- FOREIGN MATTER IN HYDRAULIC POWERPAK HELD GEAR-UP VALVE OPEN.
```

## Aircraft

- Registration: [N1247P](https://openairdocs.org/deregistered/N1247P-2013-06-14), registration cancelled 2013-06-14, S/N 23-273, built 1955 (OpenAirDocs)
- Reported make and model: PIPER PA-23
- Registry model: [Piper PA-23-150](https://openairdocs.org/model/piper-pa-23-150) (registry code 7102303) (OpenAirDocs)
- Registry engine: [Lycoming 0-320 series](https://openairdocs.org/engine/lycoming-0-320-series) (registry code 41508, reciprocating) (OpenAirDocs)
- Category: Airplane
- Engines: reciprocating
- Damage: Substantial damage
- Airport: Du Page 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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