NTSB Identification: NYC69A0094
14 CFR Part 135 Nonscheduled operation of AROOSTOOK AIRW
Aircraft: PIPER PA-23, registration: N5090Y

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 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
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3-1617  69/4/18    PORTLAND,ME         PIPER PA-23         CR-  0  0  2  COMMERCIAL                COMMERCIAL, FL.INSTR.,
        TIME - 1100                    N5090Y              PX-  0  0  4  AIR TAXI-PASSG            AGE 24, 1477 TOTAL HOURS,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            39 IN TYPE, INSTRUMENT
                                                                                                   RATED.
        NAME OF AIRPORT - PORTLAND
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           GEAR COLLAPSED                                           STATIC: STARTING ENGINE(S)
        PROBABLE CAUSE(S)
           PILOT IN COMMAND - FAILED TO FOLLOW APPROVED PROCEDURES,DIRECTIVES,ETC.
           PERSONNEL - MAINTENANCE,SERVICING,INSPECTION: IMPROPER MAINTENANCE (MAINTENANCE PERSONNEL)
           AIRFRAME - LANDING GEAR: NORMAL RETRACTION/EXTENSION ASSEMBLY
           SYSTEMS - HYDRAULIC SYSTEM: BY-PASS VALVE
           MISCELLANEOUS ACTS,CONDITIONS - IMPROPERLY INSTALLED
        REMARKS- ANTI-RETRACT POPPET VALVE REINSTALLED BACKWARDS.GR SELECTOR UP,CLOSED VALVE ALLOWED PRES BUILD-UP.

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