What was found
WHEN TURNING LT, ABOUT 20 DEGREES OF BANK, BELOW 180 KT, FULLY CONFIGURED, THE AIRPLANE LT WING SUDDENLY DROPPED PULLING THE YOKE LT EVEN MORE. THIS HAPPENED MORE THAN 3 TIMES. FOUND LT AILERON POSITION SENSOR FLEXIBLY COUPLING LOOSE ON SHAFT AND RETRACTING FREELY AROUND SHAFT REMOVED DEFECTIVE COUPLING AND INSTALLED NEW COUPLING. PERFORMED RIGGING PROCEDURE. OPS CHECKS GOOD. ALL WORK DONE IAW MM 31-44-00, REV 41.