What was found
(CAN) DURING ROUTINE MAINTENANCE INSPECTION VISUALLY NOTICED SCREW HEADS PROTRUDING ABOVE WING SURFACE ON WING STRESS PANEL (DRYBAY ACCESS). APPROXIMATELY 50 PERCENT OF THE ATTACH SCREWS (CSP318-5) WERE FOUND LOOSE ON ACESS PANEL NR 522AT, ALSO SOME LOOSE SCREWS FOUND ON DRYBAY/WING CENTER BOX ACESS PANELS 521AT AND 622AT. AIRCRAFT HAS APPROX. 1980-2372 CYCLES SINCE PREVIOUS RE-TORQUE OF THESE SCREWS AFTER MAINTENANCE ACCESS. ALL SCREWS ON THESE PANELS RE-TORQUED.