# NTSB NYC79FA064: Bell 206B, N711GT, Alpine, NJ, July 21, 1979

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: July 21, 1979
- Place: Alpine, NJ · ALPINE, NJ
- Location: 40.9688° N, 73.9169° W: Placed by OpenAirDocs: center of Alpine, NJ, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=40.9688&lon=-73.9169&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report July 29, 1980
- Report: Brief approved by the director
- NTSB case key (mKey): 133825
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=NYC79FA064
- Page: https://openairdocs.org/ntsb/NYC79FA064

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-3911  79/7/21    ALPINE,NJ           BELL 206B           CR-  0  0  1  NONCOMMERCIAL             COMMERCIAL, FL.INSTR.,
        TIME - 1019                    N711GT              PX-  0  0  1  BUSINESS                  AGE 30, 3690 TOTAL HOURS,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            1800 IN TYPE, NOT
                                                                                                   INSTRUMENT RATED.
        DEPARTURE POINT             INTENDED DESTINATION
          WHITE PLAINS,NY             BERGEN,NJ
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           AIRFRAME FAILURE: IN FLIGHT                              IN FLIGHT: NORMAL CRUISE
           PROPELLER/ROTOR FAILURE: TAIL ROTOR                      IN FLIGHT: NORMAL CRUISE
        PROBABLE CAUSE(S)
           SYSTEMS - OTHER SYSTEMS: OTHER
           MISCELLANEOUS ACTS,CONDITIONS - FATIGUE FRACTURE
           ROTORCRAFT - ROTOR ASSEMBLIES: TAIL ROTOR BLADES
           MISCELLANEOUS ACTS,CONDITIONS - OUT OF BALANCE
           ROTORCRAFT - TRANSMISSION ROTOR DRIVE SYSTEM: TAIL ROTOR GEAR BOX
           MISCELLANEOUS ACTS,CONDITIONS - OVERLOAD FAILURE
        FACTOR(S)
           MISCELLANEOUS ACTS,CONDITIONS - SEPARATION IN FLIGHT
        REMARKS- ELT ANT SEPD DUE TO FATIGUE.TAIL ROTOR GROOVES MATCH ELT ANT.TAIL ROTOR GEAR BOX STUDS FAILED.
```

## Aircraft

- Registration: N711GT (not matched to a registry record)
- Reported make and model: BELL 206B
- Category: Helicopter
- Engines: turbo shaft
- Damage: 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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