NTSB Identification: OAK73IP031
14 CFR Part 121 Scheduled operation of SAN FRAN & OAKL HEL AIRLINES
Aircraft: SIKORSKI S-61N, registration: N307Y

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 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
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4-0004  73/3/29    S.FRANCISCO,CALIF   SIKORSKI S-61N      CR-  0  0  3  SCHED DOM PASSG SRV       AIRLINE TRANSPORT, AGE
        TIME - 1554                    N307Y               PX-  0  0  7                            UNK/NR, UNK/NR TOTAL
                                       DAMAGE-MINOR        OT-  0  0  0                            HOURS, UNK/NR IN TYPE,
                                                                                                   NOT INSTRUMENT RATED.
        CLASSIFIED AS INCIDENT
        OPERATOR - SAN FRANCISCO AND OAKLAND HELICOPTER AIRLINES
        DEPARTURE POINT             INTENDED DESTINATION
          BERKELEY,CALIF              S.FRANCISCO,CALIF
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           AIRFRAME FAILURE: IN FLIGHT                              IN FLIGHT: NORMAL CRUISE
        PROBABLE CAUSE(S)
           AIRFRAME - FUSELAGE: DOORS,DOOR FRAMES
           MISCELLANEOUS ACTS,CONDITIONS - IMPROPERLY SECURED
        FACTOR(S)
           MISCELLANEOUS ACTS,CONDITIONS - SEPARATION IN FLIGHT
        EMERGENCY CIRCUMSTANCES - PRECAUTIONARY LANDING ON AIRPORT
                                  SUSPECTED OR KNOWN AIRCRAFT DAMAGE
        REMARKS- CARGO DOOR CAME OPEN,FLT ATTENDANT UN TO SECURE. DOOR SEPARATED,HIT M/R BLADE.CONT FLT & LND OK.

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