What was found
CAPTAINS PLI DROPPED TO FD PITCH BAR WHEN SLATS RETRACTED AND STICK SHAKER ACTUATED CAPTAINS SPEED INDICATOR BECAME RED, ALT MISS COMPARE, W/S DETECT FAIL ILLUMINATED, EVERYTHING WENT NORMAL WHEN SLATS EXTENDED. RETURNED TO MEM. FACT: REPLACED LT AOA SENSOR AFTER INTERROGATING NR 1 FCC SHOWING NR 1 AOA FAULTED FIVE TIMES OUT OF LAST SEVEN FLIGHTS. AFTER REPLACEMENT, REF MM 27-35-02-4, AOA SENSOR PASSED FCC RTS. AOA SENSOR REMOVED WAS NOT SMOOTH IN ITS MOVEMENT, VERY GRITTY.