What was found
SHIP 9538 -MISC/DE- THE FLIGHT CREW DECLARED AN EMERGENCY WITH ATC FOLLOWING THE RIGHT HYDRAULIC SYSTEM SHOWING A LOSS IN QUANTITY. THE QRH WAS COMPLIED WITH, BUT AN ALTERNATE GEAR EXTENSION WAS NOT REQUIRED. CORRECTIVE ACTION: MAINTENANCE CYCLED THE MLG DOORS WITH THE GEAR HANDLE UP AND FOUND THE MAIN LANDING GEAR CONTROL VALVE UNION LOOSE AND LEAKING. MAINTENANCE REPLACED THE O-RING AND RESECURED THE UNION. LEAK CHECK WAS GOOD. (LP #6930946)