What was found
AT 1004Z, AIRCRAFT DEPARTED, APPROX 30 MIN INTO FLIGHT, PILOTS CALL PTK OPS RADIO AND REPORTED TOTAL LOSS OF NR 2 HYD SYSTEM FLUID. AIRCRAFT RETURNED TO DEPARTURE. AFTER ARRIVING, THE FLIGHT MECHANIC INSPECTED THE AIRCRAFT AND FOUND THE RT AILERON TAB LOCK OUT ACTUATOR FILTER O-RING HAD RUPTURED. (K)