# NTSB UNK64X2643: Mooney MK20D, N6637U, Monroe Center, WI, July 4, 1964

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: July 4, 1964
- Place: Monroe Center, WI · MONROE CENTER, WI
- Location: 44.1119° N, 89.9396° W: Placed by OpenAirDocs: center of Monroe Center, WI, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=44.1119&lon=-89.9396&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 3 uninjured
- Status: Completed, report October 9, 1964
- Report: Brief approved by the director
- NTSB case key (mKey): 183265
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=UNK64X2643
- Page: https://openairdocs.org/ntsb/UNK64X2643

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-1932   64/7/4    MONROE CENTER WIS   MOONEY MK20D        CR-  0  0  1  NONCOMMERCIAL             PRIVATE, AGE 41, 250
        TIME - 1715                    N6637U              PX-  0  0  2  PLEASURE/PERSONAL TRANSP  TOTAL HOURS, 10 IN TYPE,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            NOT INSTRUMENT RATED.
        NAME OF AIRPORT - MONROE CENTER
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           HARD LANDING                                             LANDING: LEVEL OFF/TOUCHDOWN
           GEAR COLLAPSED                                           LANDING: ROLL
        PROBABLE CAUSE(S)
           PILOT IN COMMAND - IMPROPER LEVEL OFF
        FACTOR(S)
           MISCELLANEOUS ACTS,CONDITIONS - OVERLOAD FAILURE
```

## Aircraft

- Registration: [N6637U](https://openairdocs.org/deregistered/N6637U-2018-04-06), registration cancelled 2018-04-06, S/N 132, built 1963 (OpenAirDocs)
- Reported make and model: MOONEY MK20D
- Registry model: [Mooney M20D](https://openairdocs.org/model/mooney-m20d) (registry code 5870210) (OpenAirDocs)
- Registry engine: [Lycoming O&VO-360 series](https://openairdocs.org/engine/lycoming-o-vo-360-series) (registry code 41514, reciprocating) (OpenAirDocs)
- Category: Airplane
- Engines: reciprocating
- Damage: Substantial damage
- Airport: Monroe Center

## Other investigations on N6637U (1)

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.

- [NTSB CHI65F0092](https://openairdocs.org/ntsb/CHI65F0092), Mar 16, 1965: Mooney M20-D (N6637U), Roselle, IL, substantial damage

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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