NTSB Identification: LAX62A0073
14 CFR Part 121 Scheduled operation of AVALON AIR TRANSPORT INC
Aircraft: GRUMMAN G-21A, registration: N324

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 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
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1-0049  62/7/17    AVALON BAY,CALIF    GRUMMAN G-21A       CR-  0  0  1  SCHED DOM PASSG SRV       AIRLINE TRANSPORT, AGE
        TIME - 0930                    N324                PX-  0  0  6                            40, 9800 TOTAL HOURS,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            2600 IN TYPE, INSTRUMENT
                                                                                                   RATED.
        NAME OF AIRPORT - AVALON BAY SPB
        OPERATOR - AVALON AIR TRANSPORT,INC.
        DEPARTURE POINT             INTENDED DESTINATION
          AVALON BAY,CALIF            LONG BEACH,CALIF
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           PROPELLER/ROTOR FAILURE: PROPELLER                       TAKEOFF: RUN
        PROBABLE CAUSE(S)
           POWERPLANT - PROPELLER AND ACCESSORIES: BLADE RETENTION MECHANISM
           MISCELLANEOUS ACTS,CONDITIONS - FATIGUE FRACTURE
           MISCELLANEOUS ACTS,CONDITIONS - VIBRATION,EXCESSIVE
        FACTOR(S)
           PERSONNEL - MAINTENANCE,SERVICING,INSPECTION: INADEQUATE MAINTENANCE AND INSPECTION
        REMARKS- NR 3 PROP BLADE FAILED IN FATIGUE DUE VIBRATION CAUSED BY ROTATION OF BLADE WITHIN RETENTION CLAMP

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