# NTSB MKC76AK012: Bell 47G-5, N4753R, Keystone, SD, August 5, 1975

- Type: NTSB accident investigation
- Classification: Accident · Fatal · Closed
- Date: August 5, 1975
- Place: Keystone, SD · KEYSTONE, SD
- Location: 43.8949° N, 103.4268° W: Placed by OpenAirDocs: center of Keystone, SD, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=43.8949&lon=-103.4268&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: Fatal
- Injuries: 3 fatal
- Status: Completed, report September 30, 1975
- Report: Brief approved by the director
- NTSB case key (mKey): 150043
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=MKC76AK012
- Page: https://openairdocs.org/ntsb/MKC76AK012

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-2620   75/8/5    KEYSTONE,SD         BELL 47G-5          CR-  1  0  0  COMMERCIAL                COMMERCIAL, AGE 24, 1511
        TIME - 1830                    N4753R              PX-  2  0  0  OTHER                     TOTAL HOURS, 262 IN TYPE,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            NOT INSTRUMENT RATED.
        NAME OF AIRPORT - KEYSTONE HELIPORT
        DEPARTURE POINT             INTENDED DESTINATION
          KEYSTONE,SD                 LOCAL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           ENGINE FAILURE OR MALFUNCTION                            IN FLIGHT: NORMAL CRUISE
           COLLIDED WITH: TREES                                     LANDING: POWER-OFF AUTOROTATIVE LANDING
        PROBABLE CAUSE(S)
           PILOT IN COMMAND - INADEQUATE PREFLIGHT PREPARATION AND/OR PLANNING
           PILOT IN COMMAND - MISMANAGEMENT OF FUEL
           MISCELLANEOUS ACTS,CONDITIONS - FUEL EXHAUSTION
           TERRAIN - HIGH OBSTRUCTIONS
        FACTOR(S)
           PERSONNEL - OPERATIONAL SUPERVISORY PERSONNEL: DEFICIENCY,COMPANY MAINTAINED EQPMT,SERVICES,REGULATION
           MISCELLANEOUS ACTS,CONDITIONS - PILOT FATIGUE
        COMPLETE POWER LOSS - COMPLETE ENGINE FAILURE/FLAMEOUT-1 ENGINE
        EMERGENCY CIRCUMSTANCES - FORCED LANDING OFF AIRPORT ON LAND
        REMARKS- SIGHTSEEING.
```

## Aircraft

- Registration: [N4753R](https://openairdocs.org/deregistered/N4753R-2012-08-06), registration cancelled 2012-08-06, S/N 7923, built 1968 (OpenAirDocs)
- Reported make and model: BELL 47G-5
- Registry model: [Bell 47G-5](https://openairdocs.org/model/bell-47g-5) (registry code 1181032) (OpenAirDocs)
- Registry engine: [Lycoming VO-435 series](https://openairdocs.org/engine/lycoming-vo-435-series) (registry code 41525, reciprocating) (OpenAirDocs)
- Category: Helicopter
- Engines: reciprocating
- Damage: Substantial damage
- Airport: Keystone 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 19750805028259A](https://openairdocs.org/incident/19750805028259A), Aug 5, 1975: Bell 47G5, Keystone, SD, Destroyed, 2 fatal. Sightseeing.

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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