THE FLC WAS ASKED BY CTR IF THEY WERE FLYING AN ASSIGNED HDG. AT THIS TIME THE FLC REALIZED THEY HAD FLOWN 30 NM PAST THEIR TRANSITION TURN. IN FACT; THE PLTS COULD NOT REMEMBER WHAT THEY WERE ASSIGNED. THE FLC WERE ENGROSSED IN SCHEDULING LEGALITIES.

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AT APPROX XA30 (LCL TIME) ACR FLT XXX WAS ASKED BY ZKC IF WE WERE FLYING AN ASSIGNED HDG. WE THEN REALIZED THAT WE HAD FLOWN APPROX 30 NM BEYOND OUR TRANSITION TURN. WE ALSO REALIZED THAT WE COULDN'T REMEMBER WHAT EXACTLY OUR CLRNC WAS. WE WERE INITIALLY ASSIGNED THE TURBO 2 DEP; POCKET CITY TRANSITION FROM STL TO EVV. WE WERE FLYING 155 DEGS AND HAD BEEN ASSIGNED 150 DEG HDG AT ONE POINT. WE COULDN'T REMEMBER IF WE HAD BEEN ISSUED THE STANDARD 'HDG 120 DEGS TO INTERCEPT THE TURBO 2 DEP' AND HAD STAYED ON APPROX 150 DEG HDG APPROX 30 NM BEYOND SPORT INTXN. WE ARE STILL NOT SURE HOW THE SIT AROSE. WE WERE MADE AWARE OF THE PROB BY ZKC AND ASKED FOR AND RECEIVED DIRECT TO PXV. IF INDEED WE HAD MISSED THE CLRNC IT WAS PROBABLY DUE TO THE CAPT TRYING TO FIGURE IF A RECENT SCHEDULE CHANGE WAS LEGAL (AS OUR SCHEDULING DEPT HAS BEEN KNOWN TO OVERLOOK FLT TIME AND REST LIMITATIONS) THUS DISTRACTING ME FOR APPROX 20 MINS. ALSO DUE IN PART TO THE FO BEING FATIGUED. I BELIEVE THIS OCCURRED BECAUSE MY FO WAS FATIGUED (AND WAS THUS NOT CONCENTRATING AS WELL AS USUAL) AND I WAS BUSY TRYING TO FIGURE OUT IF I WAS LEGAL TO FLY THE ADDITIONAL TIME I WAS BEING SCHEDULED FOR. IT WAS FINALLY DECIDED BY THE THIRD SCHEDULER TO LOOK AT THIS PROB THAT I WAS CORRECT AND THAT THE COMPANY WAS TRYING TO SCHEDULE ME ILLEGALLY. IT SEEMS TO ME THAT MORE SIMPLIFIED/PLAIN LANGUAGE RULES WOULD ALLEVIATE SUCH CIRCUMSTANCES AND REDUCE OUR MENTAL WORKLOAD IN THE COCKPIT THEREFORE IMPROVING THE SAFETY OF FLT.