NTSB Identification: DEN73AD015
14 CFR Part 135 Nonscheduled operation of ROCKY MOUNTAIN
Aircraft: BELL 47G3B1, registration: N1397X

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 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
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3-3521   72/10/3 NR.HAYDEN,COLO        BELL 47G3B1         CR-  0  0  1  COMMERCIAL                COMMERCIAL, AGE 34, 6800
        TIME - 1610                    N1397X              PX-  0  0  1  AIR TAXI-PASSG            TOTAL HOURS, 3500 IN
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            TYPE, NOT INSTRUMENT
                                                                                                   RATED.
        DEPARTURE POINT             INTENDED DESTINATION
          CRAIG,COLO                  RETURN
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           PROPELLER/ROTOR FAILURE: MAIN ROTOR                      IN FLIGHT: NORMAL CRUISE
           AIRFRAME FAILURE: IN FLIGHT                              IN FLIGHT: UNCONTROLLED DESCENT
        PROBABLE CAUSE(S)
           ROTORCRAFT - TRANSMISSION ROTOR DRIVE SYSTEM: MAIN ROTOR DRIVE SHAFT
           MISCELLANEOUS ACTS,CONDITIONS - MATERIAL FAILURE
        FACTOR(S)
           MISCELLANEOUS ACTS,CONDITIONS - SEPARATION IN FLIGHT
        EMERGENCY CIRCUMSTANCES - FORCED LANDING OFF AIRPORT ON LAND
        REMARKS- COUNTING ELK.M/R MAST THRUST BEARING FAILED FOR UNDET REASON.MAST AND M/R SEPARATED BFOR IMPACT.

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