What was found
LT WING, TRAILING EDGE INBOARD AT ROOT, FLAP-TO-WING GAP SEAL. INSTALLATION IAW STC SA780GL AND STC SA928GL. WHEN FLAP LOWERED, GAP SEAL WAS CRUMPLED AND JAMMED INTO GAP AREA CAUSING POSSIBLE BINDING OF FLAP. RT WING GAP SEAL CRACKED AT 7 RIVETS ALONG LENGTH OF REAR SPAR. SUSPECT MATERIAL FATIGUE AND VIBRATION OR MISALIGNMENT. SUBMITTER RECOMMENDS ALERT NOTICE AND INSPECTION FOR CLEARANCE.