What was found
SAL - AFTER TAKEOFF, PILOTS NOTED A 50 KNOT DISCREPANCY BETWEEN THE CAPTAIN AND FIRST OFFICER AIRSPEED INDICATIONS, THEN AT FLIGHT LEVEL 3,000 FEET THE CAPTAIN SIDE SHOWED 240 KTS AND F/O''S 165 KTS, DUE THIS SITUATION THE FLIGHT RETURNED TO SAL AIRPORT. AFTER UNEVENTFUL LANDING AT EL SALVADOR, MAINTENANCE TECHS PERFORMED FLUSHING OF THE TOTAL PRESSURE LINE OF THE AIR DATA MODULE ON THE CAPTAIN AND F/O''S SIDES AS PER AMM 34-13-00, AND FOUND FOREIGN MATERIAL ON THE FIRST OFFICER PITOT PROBE. PERFORMED CHECK FLIGHT WITH NORMAL RESULTS. THE AIRPLANE RETURNED TO NORMAL OPERATION. (M)