What was found
EMERGENCY DECLARED, DURING DESCENT DUAL FMS FAILURE WITH MULTIPLE ADDITIONAL DISCONNECTS, FAILURE MESAAGES .LANDING ALT ADVISORY , FLIGHT CONTROL SYSTEM STS. AP AND AT FAILED BEGAN TO COMPLY WITH FMS NIL STATUS MESSAGE ON ARRIVAL. NIL EXISTING FAULTS IN CMC.MAINT MSG 34738 NOT ACTIVE IN PLF. FMC L AND FMC R CMC GROUND TEST PERFORMED IAW AMM 34-61-00-745-222.TEST PASSED NIL FAULTS.