What was found
AFTER TAKEOFF, CREW REPORTED DURING CLIMBOUT WHEN FLAPS WERE RETRACTED, EXCESSIVE LEFT AILERON CONTROL INPUT REQUIRED TO MAINTAIN CONTROLLED FLIGHT. DIVERTED AND LANDED WITHOUT FURTHER INCIDENT. AFTER LANDING NOTED THE LT OTBD FLAP AND LT INBD FLAP DAMAGED. INVESTIGATION REVEALED THE LT OTBD FLAP, OTBD JACKSCREW CHAIN COUPLING MISSING. FLAP DAMAGE OCCURRED DUE INBD JACKSCREW CONTINUING RETRACTION WITH OTBD JACKSCREW STATIC. NO ASYMMETRY PROTECTION DUE TO FAILED PART LOCATION IN FLAP DRIVE SYSTEM. OPEN