What was found
ON MISSED APPROACH, THE FMS PITCHED FOR AN UN COMMANDED SPEED OF 140-150 KIAS. WOULD NOT RESPOND TO MANUAL OR FMS SELECTED SPEEDS. ONCE A VERTICAL MODE WAS SELECTED (FPA) THE FWD PITCHED FOR COMMANDED PITCH. THEN ON DESCENT THE FMS SPEED SWITCHED FROM THE 290 KIAS THAT WAS PROGRAMMED TO M.63 WHICH WAS THE MAX POSSIBLE SPEED SERVICEABLE. THE PERF DESCENT SPEEDS STILL INDICATED 290/.78. INTERROGATED FAULT HISTORY DATA AND FOUND NO RELATED FAULTS. UNABLE TO DUPLICATE ANY FAULTS AT THIS TIME.