UNDERSHOT XING RESTR ALT.

Narrative

CAPT WAS FLYING. I WORKED RADIOS. ZTL INITIALLY CLRED US TO DSND FROM FL210 TO 17000 FT. SHORTLY AFTER WE BEGAN DSCNT; CTLR CLRED US DIRECT ROA; CROSS 30 NM SW OF ROA AT AND MAINTAIN 10000 FT. I ACKNOWLEDGED. AT THIS POINT WE WERE ABOUT 60 NM FROM ROA. CAPT SET UP A RELATIVELY SHALLOW DSCNT AND I SHOULD HAVE CAUGHT AT THAT TIME THAT OUR PROFILE NEEDED TO BE STEEPENED. THROUGH 18000 FT; THE CAPT CALLED FOR AND WE DID THE PRELIMINARY LNDG CHKLIST. AFTER THAT; I TOTALLY FORGOT THAT WE HAD A XING RESTR. WE RECALLED THE RESTR JUST BEFORE WE WERE AT 30 DME; AND DSNDING THROUGH 14000 FT; IT WAS CLR THAT WE COULD NOT MAKE THE RESTR. I CALLED CTR AND TOLD HIM THAT I WAS SORRY; BUT WE HAD FORGOTTEN ABOUT THE XING RESTR THAT WE OBVIOUSLY COULD NOT MAKE IT; AND I ASKED HIM IF HE WOULD LIKE FOR US TO MAKE A 360 DEG TURN TO GET DOWN TO 10000 FT. HE SAID NO; TO JUST CONTINUE THE DSCNT. AS WE APCHED 10000 FT; HE SWITCHED US TO ROA APCH. OUR TCASII DID NOT DISPLAY ANY CONFLICTING TFC. THIS IS THE FIRST TIME IN A LONG TIME THAT I HAVE MISSED A XING RESTR; BUT I AM UNHAPPY WITH MYSELF THAT I LET MY MIND WANDER SUFFICIENTLY TO ALLOW IT TO OCCUR. VIGILANCE WILL BE RE- EMPHASIZED.