FLC MISSES ALT XING ASSIGNMENT.

Narrative

ACFT; A DA-20 ON IFR FLT PLAN FROM STL TO YIP; FL290. ROUTING DIRECT FWA; V221 LFD; CRUXX 2 ARR. ACFT WAS THEN CLRED DIRECT LFD VOR BY NEXT ZAU CTLR. CTLR THEN ISSUED A DSCNT CLRNC OF PLTS DISCRETION OUT OF FL290 TO CROSS 70 MI SSW OF LFD VOR AT FL240. ACFT WAS APPROX 120 MI SSW AT TIME CLRNC WAS GIVEN. ACFT GNDSPD WAS APPROX 480 KTS. LFD VOR FREQ IS 111.20; HAS DME AND IS CATEGORIZED AS A LOW VOR. WE USE THE VOR EXTENSIVELY ON A DAY TO DAY BASIS AND ARE FAMILIAR WITH THE FACT THAT THE VOR IS WEAK AND THE NEEDLES SCALLOP UNTIL A STRONG SIGNAL IS REACHED FROM THE STATION ABOUT 70-80 MI OUT. DME ON STATION NORMAL COMES ALIVE AT ABOUT 90 MI. ACFT DSCNT PROFILE WAS 3:1; 5000 FT TO LOSE X 3 = 15 MI ACFT DSCNT WAS PROPOSED 85 MI OUT OF LFD TO MAKE 70 MI XING RESTR AT FL240. CLRNC INITIAL WAS GIVEN WHEN ACFT WAS 120 MI SSW OF LFD; ACFT HAD 35 MI TO GO BEFORE STARTED TO DSCNT. ALTHOUGH AT THIS TIME THE STATION WAS STILL ONLY GIVING US A NAVIGATIONAL FLAG. CREWMEMBERS WERE ALERTED APPROX TO 70 MI SSW OF LFD ABOUT XING RESTR AGAIN. CAPT DEPLOYED SPD BRAKES AND INITIATED A MAX DSCNT; APPROX 8000 FPM; TO GET TO ASSIGNED ALT OF FL240 AS RAPIDLY AS POSSIBLE; DSCNT WAS COMMENCED APPROX 64 MI SSW AT LFD; WHICH WAS 6 MI LATER THAN ORIGINAL XING RESTR. ZAU CTLR GAVE NO EVIDENCE THAT THERE WAS ANY TYPE OF CONFLICT WITH TFC AND THE ISSUE WAS DROPPED. I BELIEVE THAT FATIGUE WAS A CONTRIBUTING FACTOR TO THIS ALT RESTR. CREWMEMBERS WERE FERRYING ACFT HOME AFTER COMPLETING A SIXTEEN HR DAY WHICH RESULTED IN A COMPLETE NIGHT'S SLEEP LOST THE PREVIOUS NIGHT. I FEEL THAT MY FATIGUE LED ME TO BE SLIGHTLY COMPLACENT AND NOT REACT WITH THE SHARPNESS THAT I NORMALLY DEMONSTRATE IN THE COCKPIT.