What was found
(CAN) AC HAD ITS RT FINLET DEPART. AC CONDUCTING REPEAT LATERAL STABILITY TESTING. DEPARTURE WAS BOTH HEARD AND FELT BY PILOT AND TECH OBSERVER. AC RETURNED TO ITS POINT OF DEPARTURE WITH NO ADVERSE STABILITY ISSUES. UPON DETAILED INSP, IT WAS DETERMINED THAT FWD FINLET ATTACHMENT BRACKET HAD FAILED. A DESIGN IMPROVEMENT THAT ALLOWS AN INCREASE IN OVERALL STRENGTH OF ATTACHMENT POINTS. THOUGHT THAT STRESSES IMPOSED ON FINLETS DURING REPEATED LATERAL STABILITY TESTING UNDER FLIGHT PERMIT CONTRIBUTED TO FAILURE AND THAT DURING REGULAR OPERATING CONDITIONS THIS WOULD NOT OCCUR. AN INCREASED INSP SCHEDULE IS BEING INCLUDED IN THE GENERAL MAINT REQUIREMENTS OF AIRCRAFT EQUIPPED WITH FLOATS/FINLETS.