What was found
(CAN) DESCRIPTION OF DEFECTS: AIRCRAFT AFTER TAKEOFF AND ON CLAIM RECEIVED HYD 3 PRESS EICAS WARNING MESSAGE. SYSTEM NR 3 HAD NO PRESSURE. AIRCRAFT DECLARED EMERGENCY LANDING AND EMERGENCY GEAR EXTENSION AND RETURN TO FIELD. MAINTENANCE ACTIONS: MAINTENANCE HAS FOUND A HYDRAULIC LINE BURST. LINE WILL BE REPLACED WHEN PART IS GOING TO BE AVAILABLE AND AIRCRAFT WILL BE SENT BACK TO SERVICE.