THE FMS FAILED TO MAKE A XING RESTRICTION

Narrative

I MISSED THE XING RESTRICTION OF 10000 FT AT 'BUMBY' ON THE BATSN.BATSN3 ARR TO HOU. WE HAD BEEN MANEUVERING AROUND TSTMS AND HAD RECEIVED A FEW ROUTING CHANGES; THE LATEST OF WHICH WAS 'DIRECT TO DAS THEN TO THE ARPT.' AS WE APCHED HOU; WE WERE CLRED DIRECT TO BUMBY AND THE REMAINDER OF THE ARR. I STARTED THE AIRPLANE DIRECT TO BUMBY WITH THE FMS AND THEN INSERTED THE XING RESTRICTION OF 10000 FT ON THE LEGS PAGE. I THEN SELECTED THE BATSN-3 ARR FOR USE BY THE FMS. WHAT I FAILED TO NOTICE WAS THAT BY INSERTING THE ARR IN THE FMS; THE COMPUTER DUMPED THE XING RESTRICTION I HAD INSERTED JUST A FEW MOMENTS EARLIER. AT THIS POINT; I FELT COMFORTABLE WITH THE POS OF 'TOP OF DSCNT' POINT AND PROCEEDED TO LOAD IN THE APCH TO RWY 4 (ILS); WHICH HAD CHANGED FROM RWY 12R WITH A NEW ATIS MESSAGE. AT 15 MI PRIOR TO THE DSCNT POINT; I STARTED DOWN AND INTERCEPTED THE DSCNT PROFILE WELL AHEAD OF SCHEDULE. DURING THE DSCNT I BRIEFED THE APCH AND SET UP THE NAV FOR THE ILS. THROUGH ABOUT 17500 FT; APCH CTL ASKED IF WE WOULD MAKE THE BUMBY RESTRICTION (10000 FT) AND IT WAS IMMEDIATELY OBVIOUS THAT WE WOULD NOT AS THE DSCNT LINE WE WERE ON NO LONG WAS USING THE BUMBY RESTRICTION FOR COMPUTATION. THE CTLR STATED THAT IT WAS NOT A PROB AND THAT WE SHOULD JUST KEEP OUR SPD UP AND PROCEED ON THE ARR. THE LNDG WAS COMPLETED WITHOUT FURTHER INCIDENT OR DIFFICULTY. THE CAUSE; I BELIEVE; WAS A COMBINATION OF COCKPIT MGMNT OVERLOAD DURING THE APCH PHASE COUPLED WITH AN OVERCONFIDENCE IN THE FMS TO PRESENT VALID DSCNT PROFILE INFO. I ALLOWED MYSELF TO GET TOO BUSY DURING THE DSCNT TO MAKE ESSENTIAL XCHKS TO CONFIRM THE FMS WAS WORKING AS ADVERTISED. THE CORRECTION: ALWAYS DOUBLE CHK THE FMS DATA AGAINST OTHER AVAILAABLE NAV DATA TO INSURE THAT YOUR PROGRAMMING IS CORRECT AND THAT THE ACFT IS FOLLOWING ACCURATE FMS GUIDANCE. OVERCONFIDENCE IN THE FMS AND INCREASED WORKLOAD IN THE COCKPIT DURING BAD WX AND APCH PREPARATION IS NO EXCUSE FOR SOUND PILOTAGE AND THE MAINT OF SITUATIONAL AWARENESS.