What was found
WHEN CONDUCTING A ROUTINE APPROVED MODIFICATION OF THE RIGHT FLAP WE FOUND THAT THERE WAS A CRACK IN THE AFT INBOARD SPAR (P/N 2625005-18 AT THE BEND RADIUS BETWEEN WS68 AND WS53.5. THE AIRCRAFT HAS A TOTAL TIME OF 3700 HOURS ON IT WHEN THE CRACK WAS DISCOVERED. WE SUBMITTED A SIMILAR M/D REPORT WITH AN INCIDENT DATE OF 04/26/18 AND THE OPINIONS PUT FORTH IN THAT ON HOLD TRUE. THE SKIN AD RIBS IN THIS AREA SHOULD BE MADE OF A THICKER ALUMINUM AND THE RIBS MAY NEED TO MIRROR THE FRONT SPAR IN NUMBER.