THE CREW ON A JET CARGO CHARTER FLT FAILED TO SLOW TO 250 KTS WHEN DSNDING THROUGH 10000 FT. SHORTLY AFTER; THE ARTCC RADAR CTLR QUESTIONED THEIR AIRSPD AND THE FLC BEGAN A RAPID SPD REDUCTION. A XING RESTR AND BEST FORWARD SPD CLRNC HAD BEEN ASSIGNED PREVIOUSLY.

Narrative

ZAU HAD REQUESTED 320 KTS OR BETTER. IN THE DSCNT THROUGH 10000 FT TO 7000 FT I FAILED TO SLOW DOWN TO 250 KTS. I WAS STILL THINKING OF 320 KTS OR GREATER. AS WE PASSED 10000 FT MY FO ASKED IF I WAS GOING TO MAINTAIN BEST FORWARD AIRSPD AND I REPLIED; DID THE CTLR AMEND OUR SPD RESTR? ABOUT THIS TIME CTR ASKED ABOUT OUR AIRSPD. OBVIOUSLY WE SLOWED IMMEDIATELY. JUST W OF GSH AT 22000 FT WE WERE GIVEN A CLRNC TO CROSS AWSUM AT 10000 FT AND OUT OF 11000 FT WE WERE GIVEN; DSND TO 7000 FT. IN HURTLING DOWN TO 10000 FT TO MAKE THE XING RESTR I OVERLOOKED SLOWING DOWN AS I DSNDED THROUGH 10000 FT! FATIGUE ALSO CONTRIBUTED TO MY LACK OF SITUATIONAL AWARENESS. SUPPLEMENTAL INFO FROM ACN 334950: OUR CLRNC TO 10000 FT WAS A XING RESTR THAT WAS GIVEN LATE (CLOSE TO THE FIX). BEFORE WE REACHED 10000 FT THE NEW CLRNC TO 7000 FT WAS GIVEN. IN THE MIDST OF TRYING TO MAKE THE RESTR WE NEGLECTED TO SLOW DOWN THROUGH 10000 FT. ANOTHER CONTRIBUTING FACTOR WAS THE BUSY ATC ENVIRONMENT AROUND CHICAGO AND THAT I WAS BUSY TUNING NAVAIDS; TALKING ON THE RADIO; AND COMPLETING DSCNT AND APCH CHKLISTS. FURTHERMORE WE BOTH HAD BEEN ON DUTY FOR 12 PLUS HRS; SO WE WERE A LITTLE TIRED.