# NTSB UNK64X2624: Bell 47D1, N6357X, Harlingen, TX, July 3, 1964

- Type: NTSB accident investigation
- Classification: Accident · Minor injuries · Closed
- Date: July 3, 1964
- Place: Harlingen, TX · HARLINGEN, TX
- Location: 26.1906° N, 97.6961° W: Placed by OpenAirDocs: center of Harlingen, TX, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=26.1906&lon=-97.6961&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: Minor injuries
- Injuries: 2 minor
- Status: Completed, report February 5, 1965
- Report: Brief approved by the director
- NTSB case key (mKey): 183533
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=UNK64X2624
- Page: https://openairdocs.org/ntsb/UNK64X2624

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
2-0249   64/7/3    HARLINGEN TEX       BELL 47D1           CR-  0  0  1  COMMERCIAL                COMMERCIAL, AGE 34, 3000
        TIME - 1400                    N6357X              PX-  0  0  1  ASSOC CROP CTL ACTIVITY   TOTAL HOURS, 1800 IN
                                       DAMAGE-DESTROYED    OT-  0  0  0                            TYPE, NOT INSTRUMENT
                                                                                                   RATED.
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           PROPELLER/ROTOR FAILURE: TAIL ROTOR                      IN FLIGHT: NORMAL CRUISE
           HARD LANDING                                             LANDING: POWER-OFF AUTOROTATIVE LANDING
        PROBABLE CAUSE(S)
           ROTORCRAFT - TRANSMISSION ROTOR DRIVE SYSTEM: TAIL ROTOR DRIVE SHAFT ASSEMBLY
           MISCELLANEOUS ACTS,CONDITIONS - FATIGUE FRACTURE
           PERSONNEL - MAINTENANCE,SERVICING,INSPECTION: IMPROPER MAINTENANCE (MAINTENANCE PERSONNEL)
           PERSONNEL - MAINTENANCE,SERVICING,INSPECTION: INADEQUATE INSPECTION OF AIRCRAFT (MAINTENANCE PERSONNEL)
        EMERGENCY CIRCUMSTANCES - FORCED LANDING OFF AIRPORT ON LAND
```

## Aircraft

- Registration: [N6357X](https://openairdocs.org/deregistered/N6357X-1972-03-22), registration cancelled 1972-03-22, S/N B110R (OpenAirDocs)
- Reported make and model: BELL 47D1
- Registry model: [Bell Kitz Kopters 47D1](https://openairdocs.org/model/bell-kitz-kopters-47d1) (registry code 1180844) (OpenAirDocs)
- Category: Helicopter
- Engines: reciprocating
- Damage: Destroyed

## Other investigations on N6357X (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 MIA72AM075](https://openairdocs.org/ntsb/MIA72AM075), Jan 30, 1972: Bell 47D1 (N6357X), Halls X-Rds, TN, destroyed, 2 fatal
- [NTSB MIA67A0007](https://openairdocs.org/ntsb/MIA67A0007), Jul 16, 1966: Bell 47D1 (N6357X), Powell, TN, substantial damage
- [NTSB UNK64X0974](https://openairdocs.org/ntsb/UNK64X0974), Mar 18, 1964: Kitz Kopter D1 (N6357X), Sedalia, MO, 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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