What was found
ON TAKEOFF WITH FLAPS SELECTED TO 18 DEG, THE INDICATOR INDICATED 15 DEG, THEN INCREASED TO 20 DEGREES. ON APPROACH, FLAP INDICATION WAS AS FOLLOWS, 12 SELECTED, 10 INDICATED - 23 SELECTED, 23 INDICATED - 35 SELECTED, 40 INDICATED. AIRCRAFT WAS FERRIED FROM MIA TO ILN. MAINTENANCE RIGGED THE RIGHT FLAP FOLLOW-UP SYSTEM AND RELATED SYSTEM IAW DC-8 MM 27-50-00-5. LUBRICATED LEFT AND RIGHT WING FLAPS IAW DC-8 MM 12-82-01-3.