# NTSB FTW79DPJ37: Bell 47D1, N3575, Ardmore, OK, September 12, 1979

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: September 12, 1979
- Place: Ardmore, OK · ARDMORE, OK
- Location: 34.1743° N, 97.1436° W: Placed by OpenAirDocs: center of Ardmore, OK, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=34.1743&lon=-97.1436&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report December 27, 1979
- Report: Brief approved by the director
- NTSB case key (mKey): 134947
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=FTW79DPJ37
- Page: https://openairdocs.org/ntsb/FTW79DPJ37

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-2950  79/9/12    ARDMORE,OK          BELL 47D1           CR-  0  0  2  INSTRUCTIONAL             COMMERCIAL, FL.INSTR.,
        TIME - 1150                    N3575               PX-  0  0  0  DUAL                      AGE 32, 6497 TOTAL HOURS,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            1000 IN TYPE, NOT
                                                                                                   INSTRUMENT RATED.
        NAME OF AIRPORT - DOWNTOWN ARDMORE
        DEPARTURE POINT             INTENDED DESTINATION
          ARDMORE,OK                  LOCAL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           HARD LANDING                                             LANDING: POWER-OFF AUTOROTATIVE LANDING
        PROBABLE CAUSE(S)
           PILOT IN COMMAND - MISJUDGED SPEED AND ALTITUDE
        FACTOR(S)
           MISCELLANEOUS ACTS,CONDITIONS - SIMULATED CONDITIONS
        REMARKS- DEMONSTRATING LOW LVL AUTOROTATIVE LNDG.
```

## Aircraft

- Registration: [N3575](https://openairdocs.org/deregistered/N3575-2021-03-06), registration cancelled 2021-03-06, S/N K-7032 (OpenAirDocs)
- Reported make and model: BELL 47D1
- Registry model: [Bell 47D1](https://openairdocs.org/model/bell-47d1) (registry code 1180802) (OpenAirDocs)
- Registry engine: [Franklin 6V-335 series](https://openairdocs.org/engine/franklin-6v-335-series) (registry code 27039, reciprocating) (OpenAirDocs)
- Category: Helicopter
- Engines: reciprocating
- Damage: Substantial damage
- Airport: Downtown Ardmore

## FAA reports on this event (1)

The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs).

- [Accident 19790912031439A](https://openairdocs.org/incident/19790912031439A), Sep 12, 1979: Bell 47D1, Ardmore, OK, Substantial damage. Instructor demonstrating low-level autoration. Made hard landing.

## Other investigations on N3575 (3)

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 FTW91LA126](https://openairdocs.org/ntsb/FTW91LA126), Jul 24, 1991: Bell 47D-1 (N3575), Provencal, LA, substantial damage. Probable cause: FUEL LEAKAGE FROM THE FUEL DRAIN VALVE. A FACTOR WAS THE INACCESSIBILITY OF SUITABLE TERRAIN FOR FORED LANDING.
- [NTSB FTW87LA107](https://openairdocs.org/ntsb/FTW87LA107), Apr 25, 1987: Bell 47D1 (N3575), Ardmore, OK, substantial damage
- [NTSB MIA77DKG08](https://openairdocs.org/ntsb/MIA77DKG08), Dec 12, 1976: Bell 47D1 (N3575), Vanceville, GA, 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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