What was found
(CAN) DURING TRAINING FLIGHT, BALKED APPROACH AND AFTER COMPLETING THE CLIMB CHECKLIST, IT WAS NOTED THAT THE HYD FLUID QTY IN HYD SYS 1 WAS VERY LOW. THE SYSTEM WAS SHUTDOWN IAW HYD SYSTEM MALFUNCTION, LOSS OF HYD FLUID CHECKLIST. IMMEDIATE RETURN FOR LANDING. LANDED WITHOUT INCIDENT. SHORT BACK TRACK TO CLEAR THE RWY AND SHUTDOWN IN THE HOLDING BAY TO FACILITATE TOW TO THE HANGAR DUE TO ASSOCIATED LOSS OF STEERING AND BRAKES. MAINTENANCE FOUND RT LANDING GEAR UP LINE LEAKING HYD FLUID DUE TO CRACKED B-NUT ON LINE, PN 815859-69, LINE REPLACED.