What was found
UPON TAKEOFF RECEIVED A GEAR DISAGREE WARNING. HYD FLUID SHOWING 50% BUT BOTH 3AB PUMPS WERE YELLOW WITH NO HYD 3 PRESS GEAR DISAGREE, DISAGREE FIXED ITSELF, GEAR CAME UP & 3A PUMP WAS RUNNING. FLUID ON HYD 3 NOW 35% GEAR ALSO CAME DOWN NORMALLY. FOUND AIR IN HYD SYS NR 3. BLEEDING OF HYD SYS NR 3 TO REMOVE AIR IAW AMM 29-10-00. PERFORMED JACKING OF THE ACFT IAW AMM 07-11-01 TO SWING GEARS. PERFORMED FUNCTIONAL TEST OF LG EXTENSION & RETRACTION SYS IAW AMM 32-30-00. OPERATIONS CHECKED GOOD. ACFT OK FOR SERVICE. HYD SYS NR 3 WAS LOW, SERVICED SYS 3 IAW AMM 12-12-29.