What was found
IN-FLIGHT FAILURE OF BOTH ENGINE HYDRAULIC PUMPS, AND LOSS OF MAIN HYDRAULIC SYSTEM FLUID. AC DIVERTED TO HOME BASE, DECLARED EMERGENCY LANDING, UNEVENTFUL. FOUND PRESSURE HOSE ON R ENGINE HAD FAILED, DUE TO OVER-PRESSURE. FOUND RESERVOIR AIR-PRESSURE REGULATOR (PN 2702-12) HAD FAILED, CAUSING LOSS OF HEAD PRESSURE IN RESERVOIR, AND SUBSEQUENT PRESSURE SPIKES IN ENGINE PUMPS, WHICH BURST FLEX LINE ON R ENGINE HYD PUMP, AND DAMAGED FLEX LINE ON L HYD PUMP AS WELL. REPLACED L AND R ENGINE HYDRAULIC PUMPS, ALL FLEX PRESSURE LINES IN ENGINE HYDRAULIC CIRCUIT, HYDRAULIC FILTERS, RESERVOIR PRESSURE REGULATOR, CHECK VALVE, AND FILTER. BLED AIR FROM HYDRAULIC SYSTEM, PERFORMED FUNCTIONAL TESTS AND GROUND RUN, REPL