# NTSB CHI71DGJ10: Piper PA-18, N4220A, Ft.Knox, KY, August 22, 1970

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: August 22, 1970
- Place: Ft.Knox, KY · FT.KNOX, KY
- Location: 37.8916° N, 85.9672° W: Placed by OpenAirDocs: center of Fort Knox, KY, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=37.8916&lon=-85.9672&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report September 17, 1971
- Report: Brief approved by the director
- NTSB case key (mKey): 107770
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI71DGJ10
- Page: https://openairdocs.org/ntsb/CHI71DGJ10

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-4341  70/8/22    FT.KNOX,KY          PIPER PA-18         CR-  0  0  1  NONCOMMERCIAL             PRIVATE, AGE 38, 416
        TIME - 1420                    N4220A              PX-  0  0  0  PLEASURE/PERSONAL TRANSP  TOTAL HOURS, 59 IN TYPE,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            NOT INSTRUMENT RATED.
        NAME OF AIRPORT - GODMAN FIELD
        DEPARTURE POINT             INTENDED DESTINATION
          FT.KNOX,KY                  LOCAL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           GROUND-WATER LOOP-SWERVE                                 LANDING: ROLL
        PROBABLE CAUSE(S)
           PILOT IN COMMAND - FAILED TO MAINTAIN DIRECTIONAL CONTROL
        FACTOR(S)
           WEATHER - UNFAVORABLE WIND CONDITIONS
        WEATHER BRIEFING - OTHER
        WEATHER FORECAST - FORECAST SUBSTANTIALLY CORRECT
        SKY CONDITION                                            CEILING AT ACCIDENT SITE
          SCATTERED                                                UNKNOWN/NOT REPORTED
        VISIBILITY AT ACCIDENT SITE                              PRECIPITATION AT ACCIDENT SITE
          5 OR OVER(UNLIMITED)                                     NONE
        OBSTRUCTIONS TO VISION AT ACCIDENT SITE                  RELATIVE BEARING OF WIND
          NONE                                                     RIGHT CROSS WIND 068-112 DEGREES
        WIND DIRECTION-DEGREES                                   WIND VELOCITY-KNOTS
          270                                                       10
        TYPE OF WEATHER CONDITIONS                               TYPE OF FLIGHT PLAN
          VFR                                                      NONE
        REMARKS- WING TIP AND STABILATOR HIT RWY.
```

## Aircraft

- Registration: [N4220A](https://openairdocs.org/deregistered/N4220A-1981-01-20), registration cancelled 1981-01-20, S/N 18-894 (OpenAirDocs)
- Reported make and model: PIPER PA-18
- Registry model: [Piper L-21A](https://openairdocs.org/model/piper-l-21a) (registry code 7101814) (OpenAirDocs)
- Category: Airplane
- Engines: reciprocating
- Damage: Substantial damage
- Airport: Godman Field

## Other investigations on N4220A (2)

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 CHI72DLQ14](https://openairdocs.org/ntsb/CHI72DLQ14), Sep 22, 1971: Piper PA-18 (N4220A), Fort Knox, KY, substantial damage
- [NTSB NYC65F/UOK](https://openairdocs.org/ntsb/NYC65F%2FUOK), Apr 5, 1965: Piper PA-18 (N4220A), Ft Eustis, VA, 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.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.