F100 CREW FAILS TO MAKE AN ALT XING RESTR. A CASUAL CHK OF THE PROGRESS PAGE SATISFIED THE FO THAT ALL WAS WELL. RPTR FO SAYS HE SHOULD HAVE CHKED THE RAW DATA MORE CLOSELY PLUS A FEW MORE TIPS.

Narrative

ON DSCNT INTO SLC; ATC CLRED US FROM FL280 TO CROSS 16000 FT AT SPANE ON THE SPANE ARR. THE CAPT WAS FLYING AND HE STARTED DOWN USING THE IMMEDIATE DSCNT MODE OF THE PROFILE MODE OF THE FMS. APPROX 10 MI FROM SPANE; ATC QUERIED US IF WE WOULD MAKE THE ALT. I LOOKED AT THE NAV DISPLAY AND IT LOOKED CLOSE (I DON'T REMEMBER THE EXACT NUMBERS). I WAS RUNNING THE DSCNT CHK AND GETTING THE CHANGEOVER RPT. INSTEAD OF DOING THE MATH; I SIMPLY WENT TO THE PROGRESS PAGE OF THE FMS AND CHKED THE DSCNT PROGRESS. IT HAD US BELOW THE PROFILE BY MORE THAN 1500 FT SO I DID NOT PURSUE IT FURTHER AND STATED WE WOULD MAKE IT. THE CAPT CONCURRED. WE ENDED UP XING AT FL205. WE NOTIFIED ATC AND THEY TOLD US TO CONTINUE. PASSING FL180; WHEN I WENT TO RESET QNH; I NOTICED I HAD INADVERTENTLY PRE-SET THE FIELD QFE OF 29.93 IN THE QNH WINDOW. THIS SHOULD NOT HAVE AFFECTED THE FMS PROFILE; HOWEVER; SINCE AUTOPLT #1 WAS IN USE. LESSONS LEARNED: 1) ATC CLRNCS ARE MORE IMPORTANT THAN CHKLISTS. 2) TAKE ATC HINTS ABOUT ALT QUERIES MORE SERIOUSLY. 3) STAY IN THE LOOP ON ACFT POS WHEN NOT FLYING. 4) DON'T RELY ON FMS DATA ALONE; AND 5) ALWAYS MONITOR RAW DATA.