FLC OF AN MD88 FAILED TO RESET ALTIMETERS DURING DSCNT THROUGH FL180 RESULTING IN OVERSHOOTING STAR XING ALT DUE TO DISTR OF AN ACFT EQUIP PROB. AS THEY WERE CORRECTING BACK TO THE XING ALT; ATC INTERVENED TO INQUIRE ABOUT THEIR ALT.

Narrative

WE WERE DSNDING ON THE GLEN ROSE 3 ARR INTO DFW. PASSING 20000 FT THE FLT ATTENDANTS CALLED BUT WERE UNABLE TO HEAR US THROUGH THE INTERPHONE. THE CAPT AND I DISCUSSED WHETHER WE SHOULD PUT THIS IN THE LOGBOOK AND IF WE HAD TIME TO CALL AHEAD AND NOTIFY MAINT (WE DID NOT). THE CAPT THEN QUERIED APCH CTL ABOUT THE SPD RESTRS AND APCH SAID WE COULD DELETE ALL RESTRS EXCEPT AT DELMO; THE LAST FIX ON THE ARR. I DELETED ALL PREVIOUS SPDS IN THE FMS BUT ALSO INADVERTENTLY DELETED THE 11000 FT ALT RESTR AT HIRST; WHICH STILL APPLIED. ALTHOUGH THE FMS SHOWED WE WERE ON THE CORRECT DSCNT PROFILE; THIS WAS FOR THE SPD AND ALT AT DELMO; NOT HIRST. THE CAPT NOTICED WE WERE HIGH AND DEPLOYED THE SPD BRAKE. WE LEVELED AT 11000 FT INDICATED AND IMMEDIATELY REALIZED WE HAD BEEN DISTRACTED (BY THE INTERPHONE PROB AND BY TRYING TO MAKE THE 11000 FT ALT AT HIRST WHICH WAS NOT PROPERLY PROGRAMMED IN THE FMS) AND HAD NOT PERFORMED A DSCNT CHK. ALTIMETERS WERE STILL READING 29.92; AND SINCE THE LCL SETTING WAS APPROX 29.62; WE WERE 300 FT LOW. WE INITIATED A CLB AS ATC CALLED TO QUESTION OUR ALT.