What was found
ON ROTATION, FLT 251, EWR-MDW, AT EWR FELT THUMP FROM MAIN GEAR. ANTI-SKID INDICATIONS ABNORMAL AFTER GEAR RETRACTION. ANTI-SIDE TESTED NORMAL AFTER GEAR EXTENSION BEFORE LANDING AT EWR. CHECKED ALL TIRES, JACKED GEARS, SPUN ALL TIRES. CHECKED ANTI-SKID AS PER MM 32-42-0. ALL CHECKS OK. ALSO, CHECKED ALL ENGINE , FOUND OK. (M)