FLC OF B747-100 ON TKOF AND INITIAL CLB FINDS LOSS OF AILERON CTL ON THE FO'S CTLS. FUEL IS DUMPED AND A RETURN LAND EXECUTED. JETTISON PUMPS FAILED WHEN DUMPING FUEL.

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NORMAL DEP FOR AN INTL TRIP. FO TO PERFORM THE TKOF. ALL FLT CTL CHKS NORMAL. DURING TKOF; CAPT NOTICED ROTATION BY FO STOPPED AT 10 DEGS NOSE UP. CALLED TO CONTINUE TO ROTATE TO 15 DEGS TARGET PITCH ALT. PREVIOUS LEG BY FO WAS OBSERVED TO PERFORM 2 STAGE ROTATION. FO CONTINUED TO PERFORM SMOOTH 2 DEG PER SECOND ROTATION TO 15 DEGS. AT 400 FT; COMMENCED L TURN ON COURSE. FO RESPONDED UNABLE TO MOVE AILERONS. CAPT ASSUMED CTL AND CONTINUED DEP. DURING CLB; NOTED 1 1/2 INCHES LOST MOTION ON FO CTLS BY CAPT AND FE (FO CTLS OBSERVED). CAPT'S CTLS OPERATED NORMALLY WITH LIGHT PRESSURE. AFTER FLAP RETRACTION; SAME PROB WITH JAMMED/RESTR FO CTLS. PERFORMED ABNORMAL/EMER CHKLIST PER COMPANY PROCS. RETURNED TO JEDDAH BASE; DUMPED FUEL AND NORMAL LNDG RATHER THAN 5 HR TRIP INTO ARPT IN LOW VISIBILITY CONDITIONS (MONSOON). MECHS FOUND BROKEN SPRING IN LOST MOTION CTL BOX. DURING DUMP #3 MAIN TANK INBOARD AND OUTBOARD JETTISON PUMPS FAILED. PERFORMED CHKLIST PROCS TO CONTINUE DUMP AND MAINTAIN LATERAL FUEL BAL. WHAT MORE COULD GO WRONG? WE HAD EXCELLENT CRM AND HANDLED PROB WELL WITH A RETURN TO BASE AND NOTHING OVERLOOKED. TODAY'S FLT TECHNICIANS ARE NOT WORKING MANY SYS OR PROPERLY INSPECTING THEM. THE B747- 100 NEEDS LOTS OF ATTN.