What was found
AFTER TAKEOFF, FLT CREW NOTICED HYD SYSTEM-A QUANTITY LOSS. A/C RETURNED TO MFE & MADE UNEVENTFUL OVERWEIGHT LANDING. B AND STANDBY HYD SYS NOT AFFECTED. MX DISCOVERED FLUID LEAKING FROM SHAFT SEALS ON NR 4 SPOILER ACTUATOR. SPOILER ACTUATORS ARE UNDER A-SYS HYD PRESS WHEN IN DOWN POSITION. FLUID LOSS FROM NR 4 SPOILER ACTUATOR DEPLETED A-SYS HYD FLUID. MX R & R NR 4 GROUND SPOILER ACTUATOR. DURING OPS CHECKS OF HYD SYS, IT WAS ALSO DISCOVERED THAT NR 2 HYD EDP WOULD NOT DEVELOP PRESSURE & WAS R & R. AS A PRECAUTION THE A-SYS HYD FILTERS WERE REPLACED. OPS & LEAK CHECKS COMPLETED IAW BOEING MM 27-62-72. A/C WAS RETURNED TO SERVICE AFTER OVERWEIGHT LANDING INSPECTION. (M)