AN S80 FLC FAILS TO TURN WHEN PASSING DJB VOR DIRECT CXR WHILE IN COM WITH ZOB; OH.

Narrative

OUR ROUTING WAS DJB DIRECT CXR. I WAS THE PF AND DID NOT MAKE THE TURN AT DJB. CTR CORRECTED OUR ERROR -- AN EMBARRASSMENT ITSELF. UP TO THIS POINT; WE WERE DILIGENT IN THE COCKPIT WITH CHARTS OUT AND IN USE; NAVAIDS TUNED AND PROPERLY SET UP. MEALS WERE SERVED AT THIS TIME. THE DISTR OBVIOUSLY DREW MY ATTN FROM THE JOB AT HAND. I WOULD END THIS RPT HERE SINCE I FEEL FURTHER EXPLANATION SOUNDS LIKE EXCUSE MAKING; BUT I HAVE BEEN TRYING TO RUN MY COCKPIT IN A MANNER THAT ENSURES THIS STUFF DOES NOT HAPPEN AND I AM DISAPPOINTED THAT IT DID. PERHAPS THE CONTRIBUTING FACTORS ARE WORTH RPTING TO YOU. 1) FATIGUE WAS A FACTOR. THIS IS A LONG HARD TRIP AND EACH LEG PRESENTED US WITH AN UNUSUAL CHALLENGE OR PROB TO SOLVE. THE FIRST LEG OF THIS DAY STARTED WITH FOG AT LGA -- 1 RWY OP INITIALLY WITH LIGHTING OUT -- EVENTUALLY 3 RWY CHANGES; 6 CLBOUT CHANGES; ETC. BY THE TIME WE BLEW BY DJB; WE WERE APCHING 11 HRS ON DUTY AND OVER 7 HRS IN THE SEAT. 2) HUNGER -- WE ARE FED ON BOTH LEGS AND I ATE BEFORE FLYING THIS LEG; BUT I WAS NOT EATING ANY FULL MEALS THAT DAY AND WAS BEGINNING TO FADE PRIOR TO THIS INCIDENT. AFTER EATING; I BECAME NOTICEABLY MORE ALERT. 3) THIS WAS OUR FIRST NON GPS ACFT ON THIS TRIP. BUT; LACK OF GPS IS MORE COMMON AND WE WERE ON TOP OF THE NAV PRIOR TO THIS INCIDENT. NOTHING OCCURRED HERE THAT WAS UNUSUAL OR TAXIING ON ITS OWN. I NEEDED A LITTLE EXTRA AT THIS POINT; BUT JUST HAD NOTHING EXTRA TO GIVE WHEN WE MISSED THE TURN. SUPPLEMENTAL INFO FROM ACN 452249: WE BOTH HAD HAD A SNACK AT DFW; BUT THE MEALS ON THIS SEQUENCE ARE FEW AND FAR BTWN. NEITHER ONE OF US HAD HAD A PROPER BREAKFAST BECAUSE THE HOTEL RESTAURANT OPENED LATE ON THE WKENDS. WE WERE EXERCISING DUE CAUTION AND WERE NOT ENGAGED IN SPURIOUS CONVERSATION; BUT I WAS HUNGRY AND FEELING THE EFFECTS OF THE LONG DAY. JUST PRIOR TO DJB; THE #1 FLT ATTENDANT CAME UP WITH OUR MEALS. WE SETTLED DOWN TOGETHER TO EAT QUICKLY BECAUSE WE HAD ONLY 1 HR UNTIL LNDG AT LGA. AT THIS TIME; CLE CALLED US AND ASKED IF WE WERE IN THE R TURN TO CXR. I RESPONDED IN THE AFFIRMATIVE AS THE CAPT TURNED THE ACFT. CLE GAVE US A HDG TO INTERCEPT THE COURSE OUT OF CXR WHICH SPARED US A LARGE S-TURN TO RETURN TO THE PROPER FLT PATH. WE ASKED CLE IF THERE HAD BEEN ANY PROBS AND HE RESPONDED CALMLY IN THE NEGATIVE. THIS IS NOT A PROB WITH COMPLACENCY. WE WERE NOT NEGLIGENT. WE WERE TIRED; AND I WAS EXTREMELY HUNGRY -- INDICATIVE OF A LOW BLOOD SUGAR STATE. IT DOES AFFECT YOUR DECISION MAKING PROCESS. WE MADE A MISTAKE AND WE DID FAIL TO TURN TO THE OUTBOUND COURSE AND I DID FAIL TO SELECT THE INBOUND COURSE TO CXR. BUT I THINK A SIGNIFICANT FACTOR TO HAVING THIS SMALL; NORMAL DISTR AFFECT A CREW ACTING IN A PROFESSIONAL MANNER WAS OUR PHYSICAL CONDITION OF FATIGUE COUPLED WITH A LACK OF PROPER NUTRITION. AFTER WE HAD EATEN; WE BOTH FELT BETTER; AND THE REST OF THE FLT WAS NORMAL.