# NTSB SEA67D0141: Porterfield CP-50, N21973, Yamhill, OR, August 6, 1966

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: August 6, 1966
- Place: Yamhill, OR · YAMHILL, OR
- Location: 45.3408° N, 123.1845° W: Placed by OpenAirDocs: center of Yamhill, OR, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=45.3408&lon=-123.1845&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report February 28, 1967
- Report: Brief approved by the director
- NTSB case key (mKey): 121291
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA67D0141
- Page: https://openairdocs.org/ntsb/SEA67D0141

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-3674   66/8/6    YAMHILL OREG        PORTERFIELD CP-50   CR-  0  0  1  NONCOMMERCIAL             PRIVATE, AGE 26, 104
        TIME - 1130                    N21973              PX-  0  0  1  PLEASURE/PERSONAL TRANSP  TOTAL HOURS, 4 IN TYPE,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            NOT INSTRUMENT RATED.
        NAME OF AIRPORT - MCDANIEL STRIP
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           NOSE OVER/DOWN                                           LANDING: ROLL
        PROBABLE CAUSE(S)
           PILOT IN COMMAND - IMPROPER OPERATION OF BRAKES AND/OR FLIGHT CONTROLS
```

## Aircraft

- Registration: [N21973](https://openairdocs.org/aircraft/N21973), registered now, S/N 559, built 1939 (OpenAirDocs)
- Reported make and model: PORTERFIELD CP-50
- Registry model: [Porterfield CP-50](https://openairdocs.org/model/porterfield-cp-50) (registry code 6480114) (OpenAirDocs)
- Registry engine: [Continental A50 series](https://openairdocs.org/engine/continental-a50-series) (registry code 17002, reciprocating) (OpenAirDocs)
- Category: Airplane
- Engines: reciprocating
- Damage: Substantial damage
- Airport: Mcdaniel Strip

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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