What was found
AC RETURNED TO PLATFORM DURING TAKEOFF, LT SPEED INDICATOR HAD 80 KNTS AND RT SPEED INDICATOR AT 65 KNTS. DURING REVISION WERE DETECTED CADC NR 2 WITH FAILURE IN CDUS, RT SPEED INDICATOR FLAG AND FAST/ SLOW FUNCTION IN RT PFD WITH FAILURE. CADC NR 2 WAS TESTED IAW MM, CONNECTION LINES AND PITOT TUBE AND STATIC PORT WERE CLEANED, ALL TEST CORRECT. BOTH CADC WERE REPLACED, ALL CORRECT.