What was found
WHEN FLAPS WERE SELECTED TO 30 DEGREES ON APPROACH, THE AIRCRAFT ROLLED LEFT. THE FLAPS WERE SET TO 25 DEGREES AND THE ROLL STOPPED. THE AIRCRAFT LANDED WITHOUT INCIDENT. MAINTENANCE FOUND THE LEFT INBOARD AFT FLAP STICKING IN THE UP POSITION WITH FLAPS LOWERED. THE LEFT INBOARD AFT FLAP DRIVE MECHANISM HAD A WORN CENTER BEARING. THE FLAP DRIVE MECHANISM WAS REPLACED. THE FLAPS WERE CYCLED SEVERAL TIMES WITH NO DEFECTS. IN ADDITION, THE LEFT INBOARD TRAILING EDGE FLAP WAS ADJUSTED/TESTED IAW MM 27-51-12, PAGES 501 TO 506.