# NTSB MKC78FTK40: Bell 47-J2, N90547, Cactus Flats, SD, September 19, 1978

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: September 19, 1978
- Place: Cactus Flats, SD · CACTUS FLATS, SD
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 3 uninjured
- Status: Completed, report December 19, 1978
- Report: Brief approved by the director
- NTSB case key (mKey): 139347
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=MKC78FTK40
- Page: https://openairdocs.org/ntsb/MKC78FTK40

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-3238  78/9/19    CACTUS FLATS,SD     BELL 47-J2          CR-  0  0  1  MISCELLANEOUS             COMMERCIAL, AGE 26, 453
        TIME - 1215                    N90547              PX-  0  0  2  OTHER                     TOTAL HOURS, 163 IN TYPE,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            NOT INSTRUMENT RATED.
        NAME OF AIRPORT - HELIPORT
        DEPARTURE POINT             INTENDED DESTINATION
          CACTUS FLATS,SD             LOCAL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           HARD LANDING                                             LANDING: POWER-ON LANDING
        PROBABLE CAUSE(S)
           PILOT IN COMMAND - FAILED TO MAINTAIN ADEQUATE ROTOR R.P.M.
        EMERGENCY CIRCUMSTANCES - FORCED LANDING OFF AIRPORT ON LAND
        REMARKS- SIGHT SEEING OPERATION.OVERSPEEDING ENG INDICATING ROTOR DRIVE DISCONNECTION.NO MECH MAL FOUND.
```

## Aircraft

- Registration: [N90547](https://openairdocs.org/deregistered/N90547-2017-06-30), registration cancelled 2017-06-30, S/N 1839, built 1961 (OpenAirDocs)
- Reported make and model: BELL 47-J2
- Registry model: [Bell 47J-2](https://openairdocs.org/model/bell-47j-2) (registry code 1181104) (OpenAirDocs)
- Registry engine: [Lycoming VO-540 series](https://openairdocs.org/engine/lycoming-vo-540-series) (registry code 41534, reciprocating) (OpenAirDocs)
- Category: Helicopter
- Engines: reciprocating
- Damage: Substantial damage
- Airport: Heliport

## 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 19780919035209A](https://openairdocs.org/incident/19780919035209A), Sep 19, 1978: Bell 47J2A, Cactus Flats, SD, Substantial damage. Sight seeing operation. Overspeeding eng indicating rotor drive dinection. No mech mal found.

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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