What was found
AIRCRAFT EXPERIENCED HYDRAULIC PRESSURE LOSS. EMERGENCY GEAR EXTENSION WAS PERFORMED AND AN UNEVENTFUL LANDING ACCOMPLISHED. FOUND PRESSURE REGULATOR LEAKING. REPLACED REGULATOR WITH SERVICEABLE UNIT. REPLACED BOTH ENGINE DRIVEN HYDRAULIC PUMPS AND HYDRAULIC SYSTEM FILTERS. C/W LANDING GEAR RETRACTION AND EXTENSION CHECKS IAW LEARJET MM. SERVICED HYDRAULIC AND EMERGENCY AIR SYSTEM, RAN ENGINES, AND LEAK CHECKED HYDRAULIC SYSTEM. (X)