NTSB Identification: SEA78FTA08
14 CFR Part 91 General Aviation
Aircraft: BELL 47G3B1, registration: N7860S

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 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
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3-4182  77/12/20 NR.BILLINGS,MT        BELL 47G3B1         CR-  0  0  1  NONCOMMERCIAL             AIRLINE TRANSPORT, AGE
        TIME - 1500                    N7860S              PX-  0  0  2  BUSINESS                  45, 17500 TOTAL HOURS,
                                       DAMAGE-DESTROYED    OT-  0  0  0                            700 IN TYPE, NOT
                                                                                                   INSTRUMENT RATED.
        DEPARTURE POINT             INTENDED DESTINATION
         BILLINGS,MT                  LOCAL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           PROPELLER/ROTOR FAILURE: MAIN ROTOR                      IN FLIGHT: NORMAL CRUISE
           HARD LANDING                                             LANDING: POWER-OFF AUTOROTATIVE LANDING
        PROBABLE CAUSE(S)
           ROTORCRAFT - TRANSMISSION ROTOR DRIVE SYSTEM: OTHER
           MISCELLANEOUS ACTS,CONDITIONS - IMPROPER CLEARANCE-TOLERANCE
           MISCELLANEOUS ACTS,CONDITIONS - EXCESSIVE-WEAR/PLAY
           MISCELLANEOUS ACTS,CONDITIONS - IMPROPERLY INSTALLED
           PERSONNEL - MAINTENANCE,SERVICING,INSPECTION: INADEQUATE MAINTENANCE AND INSPECTION
        EMERGENCY CIRCUMSTANCES - FORCED LANDING OFF AIRPORT ON LAND
                                  UNUSUAL NOISE
        REMARKS- ATTMTD AUTOROTATION DUE LOUD NOISE. COLLECTIVE WAS INOP. WRONG TRANSMISSION INSTALLED.

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