What was found
AIRCRAFT LOST "B HYD PRESSURE IN FLIGHT AS THE RESULT OF HYD FLUID LOSS. FOUND FLUID TO BE LEAKING FROM PN AN814-6J PLUG, O-RING NAS1612-6 (REF. IPC 29-20-00, FIG.1001, PAGE 1, ITEM 17.) PLUG WAS FOUND TO BE AT LESS THAN SPECIFIED TORQUE. THIS PLUG IS INSTALLED ON PN 6707005-7 MANIFOLD ASSY-RUDDER STANDBY (REF.IPC 29-20-00, FIG. 1001, PAGE 1, ITEM 1.) O-RING WAS REPLACED, FILTERS CHECKED FOR DEBRIS, SYSTEM BLED AND OPERATIONALLY CHECKED. ACFT WAS RETURNED TO SERVICE.