# NTSB UNK64X2452: Bell 47G, N4734S, Vivian, LA, June 23, 1964

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: June 23, 1964
- Place: Vivian, LA · VIVIAN, LA
- Location: 32.8711° N, 93.9862° W: Placed by OpenAirDocs: center of Vivian, LA, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=32.8711&lon=-93.9862&mi=10
- Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report February 4, 1965
- Report: Brief approved by the director
- NTSB case key (mKey): 183509
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=UNK64X2452
- Page: https://openairdocs.org/ntsb/UNK64X2452

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
2-0216  64/6/23    VIVIAN LA           BELL 47G            CR-  0  0  1  MISCELLANEOUS             COMMERCIAL, AGE 34, 800
        TIME - 1700                    N4734S              PX-  0  0  0  TEST                      TOTAL HOURS, 400 IN TYPE,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            NOT INSTRUMENT RATED.
        NAME OF AIRPORT - VIVIAN
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           MISCELLANEOUS                                            IN FLIGHT: HOVERING
           HARD LANDING                                             LANDING: POWER-ON LANDING
        PROBABLE CAUSE(S)
           ROTORCRAFT - TRANSMISSION ROTOR DRIVE SYSTEM: TAIL ROTOR DRIVE SHAFT ASSEMBLY
           MISCELLANEOUS ACTS,CONDITIONS - IMPROPERLY INSTALLED
           MISCELLANEOUS ACTS,CONDITIONS - SEPARATION IN FLIGHT
           PERSONNEL - MAINTENANCE,SERVICING,INSPECTION: IMPROPER MAINTENANCE (MAINTENANCE PERSONNEL)
           PERSONNEL - MAINTENANCE,SERVICING,INSPECTION: INADEQUATE INSPECTION OF AIRCRAFT (MAINTENANCE PERSONNEL)
        EMERGENCY CIRCUMSTANCES - PRECAUTIONARY LANDING ON AIRPORT
         FIRE AFTER IMPACT
        REMARKS- PILOT LOST ANTITORQUE CONTROL.TAIL ROTOR DRIVE LOCK NUT NOT SECURED,DOWELL PIN MISSING FROM SHAFT.
```

## Aircraft

- Registration: [N4734S](https://openairdocs.org/deregistered/N4734S-2012-12-11), registration cancelled 2012-12-11, S/N SA3, built 1963 (OpenAirDocs)
- Reported make and model: BELL 47G
- Registry model: [Bell 47G](https://openairdocs.org/model/bell-47g) (registry code 1181002) (OpenAirDocs)
- Registry engine: [Franklin 6V4 series](https://openairdocs.org/engine/franklin-6v4-series) (registry code 27033, reciprocating) (OpenAirDocs)
- Category: Helicopter
- Engines: reciprocating
- Damage: Substantial damage
- Airport: Vivian

## Other investigations on N4734S (4)

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 CHI79FEM34](https://openairdocs.org/ntsb/CHI79FEM34), Aug 16, 1979: Bell 47G-2 (N4734S), Hart, MI, substantial damage
- [NTSB CHI74DEM57](https://openairdocs.org/ntsb/CHI74DEM57), May 1, 1974: Bell 47G (N4734S), Hart, MI, substantial damage
- [NTSB MKC67A0034](https://openairdocs.org/ntsb/MKC67A0034), Nov 7, 1966: Bell 47G (N4734S), Hariton, IA, substantial damage
- [NTSB UNK64X1983](https://openairdocs.org/ntsb/UNK64X1983), May 27, 1964: Bell 47G (N4734S), Pana, IL, 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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