FLC OF AN MLG RPT A XING RESTR DEV THAT RESULTED FROM AN FMS WAYPOINT BYPASS. THE FMS WAS NOT BACKED UP WITH RAW DATA OR CHKED AGAINST A DSCNT PROFILE FORMULA. ALTDEV ALT UNDERSHOT XING RESTR.

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ZBW GAVE OUR FLT A CLRNC TO CROSS 25 MI N OF SPARTA VOR AT 7000 FT. ALSO; ZBW GAVE THE PF A HDG TO INTERCEPT V213 TO SPARTA VOR. I READ BACK THE CLRNC; THEN GOT ON THE #2 RADIO TO GET THE ATIS; TALK TO OPS; AND GIVE A PA TO THE PAX. WHEN I FINISHED MY PA WE WERE ESTABLISHED ON V213 AND DSNDING AT 1000 FPM FROM 14000 FT MSL TO 7000 FT MSL. THE CAPT DID A DIRECT INTERCEPT USING LNAV TO GET ESTABLISHED ON V213; BUT SOMEHOW GOT A FIX BYPASS (25 MI N OF SPARTA VOR); AND WE CROSSED 25 MI N OF SPARTA AT 10000 FT MSL INSTEAD OF 7000 FT MSL. ZBW SAID 'EXPEDITE TO 7000 FT MSL.' I SAID; 'WHERE'S THE TFC?' CTR SAID; 'THERE'S NO TFC; I GOT TO GET YOU DOWN FOR ZNY AIRSPACE.' THERE WAS NEVER A TFC CONFLICT. THE CAPT AND FO FAILED TO MONITOR THE AIRPLANE DSCNT. THE PROB COULD HAVE OCCURRED BECAUSE THE CREW WAS A LITTLE TIRED BECAUSE 2 NIGHTS EARLIER WE WERE DELAYED 3 1/2 TO 4 HRS OUT OF NEWARK (ATC WX DELAYS) AND GOT TO BED IN COS AT XA30 AM. SUPPLEMENTAL INFO FROM ACN 342120: I HAVE FLOWN THIS RTE BEFORE AND USUALLY USE FLOSI INTXN (30 DME) FOR THE 7000 FT RESTR. I DO BELIEVE THE 25 NM FIX WAS PUT IN BTWN FLOSI AND CRANK; BUT I FIRST SHOULD HAVE HAD THE PNF BACK ME UP ON RAW DATA; AND SECOND; BACK UP THE FMS WITH A 3 DEG DSCNT RATE. I THINK FROM NOW ON I WILL TRY TO MAKE THE XING RESTR SIMPLER AND USE THE FIX ON THE RTE EVEN IF IT IS A LITTLE EARLY. I WISH ZBW WOULD USE THE NAMED FIX FOR THE 7000 FT XING RESTR.