NTSB Identification: CHI72FEC47
14 CFR Part 91 General Aviation
Aircraft: BELL 47G-5, registration: N7979J

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 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
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3-1897  72/5/25    DETROIT,MICH        BELL 47G-5          CR-  0  0  2  MISCELLANEOUS             COMMERCIAL, AGE 33, 900
        TIME - 2230                    N7979J              PX-  0  0  0  POLICE PATROL             TOTAL HOURS, 190 IN TYPE,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            NOT INSTRUMENT RATED.
        NAME OF AIRPORT - DETROIT CITY
        DEPARTURE POINT             INTENDED DESTINATION
          DETROIT,MICH                LOCAL
        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 GEAR BOX
           MISCELLANEOUS ACTS,CONDITIONS - IMPROPERLY SECURED
           MISCELLANEOUS ACTS,CONDITIONS - IMPROPERLY INSTALLED
           PERSONNEL - MAINTENANCE,SERVICING,INSPECTION: INADEQUATE MAINTENANCE AND INSPECTION
           MISCELLANEOUS - EVASIVE MANEUVER TO AVOID COLLISION
        EMERGENCY CIRCUMSTANCES - FORCED LANDING ON AIRPORT/SEAPLANE BASE/HELIPT.
        REMARKS- T/R SYS FAILED DUE OMISSION OF RETAINING NUT ON PITCH CHNG MECHANISM. HAD TO AVOID PARKED ACFT.

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