# NTSB CHI68D0276: Lockheed 12A, N4001, Montello, WI, August 10, 1967

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: August 10, 1967
- Place: Montello, WI · MONTELLO, WI
- Location: 43.7944° N, 89.3332° W: Placed by OpenAirDocs: center of Montello, WI, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=43.7944&lon=-89.3332&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report November 1, 1967
- Report: Brief approved by the director
- NTSB case key (mKey): 115165
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI68D0276
- Page: https://openairdocs.org/ntsb/CHI68D0276

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-2725  67/8/10    MONTELLO,WIS        LOCKHEED 12A        CR-  0  0  1  NONCOMMERCIAL             COMMERCIAL, AGE 45, 3500
        TIME - 1710                    N4001               PX-  0  0  1  PLEASURE/PERSONAL TRANSP  TOTAL HOURS, 7 IN TYPE,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            INSTRUMENT RATED.
        NAME OF AIRPORT - DAGGETT
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           GEAR COLLAPSED                                           LANDING: ROLL
        PROBABLE CAUSE(S)
           AIRFRAME - LANDING GEAR: NORMAL RETRACTION/EXTENSION ASSEMBLY
           MISCELLANEOUS ACTS,CONDITIONS - MATERIAL FAILURE
        REMARKS- RIGHT HAND OUTBOARD BEARING SUPPORT BOLTS FAILED,ALLOWING THE JACK SHAFT TO BEND AFT.
```

## Aircraft

- Registration: [N4001](https://openairdocs.org/aircraft/N4001), registered now, S/N 1280 (OpenAirDocs)
- Reported make and model: LOCKHEED 12A
- Registry model: [Lockheed 12A](https://openairdocs.org/model/lockheed-12a) (registry code 5261402) (OpenAirDocs)
- Registry engine: [Pratt & Whitney R-985 series](https://openairdocs.org/engine/pratt-whitney-r-985-series) (registry code 52008, reciprocating) (OpenAirDocs)
- Category: Airplane
- Engines: reciprocating
- Damage: Substantial damage
- Airport: Daggett

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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