AN ACR MLG FLC OVERSHOT THE LOC COURSE DURING AN APCH. THE ENGS ON THIS ACFT COULD NOT BE RETARDED BELOW THE 'HIGH IDLE' POS DUE TO A MALFUNCTION AND THE EFFECT OF THIS ON THE DSCNT RATE AND THE CAPT'S ADMITTED FATIGUE CAUSED THE FLC TO BE DISTR.

Narrative

MY MOST VIVID LESSON ABOUT FATIGUE. THE ACFT HAD DEFERRED MAINT ITEMS THAT AFFECTED THE RATE OF DSCNT; ENGS OPERATING AT 'HIGH IDLE' RPM. DURING APCH PHASE; WHEN CLRNC FOR VISUAL APCH RECEIVED; WE ALSO HAD INSTRUCTIONS TO SLOW. THE ACFT PERFORMANCE WAS SUCH THAT TO SLOW DOWN AND DSND AT THE SAME TIME WAS ALMOST IMPOSSIBLE. I BECAME FIXATED ON THE SPD AND DSCNT PROB; AND MOMENTARILY LOST TRACK OF OUR HORIZ NAV SIT. AFTER REALIZING I HAD CROSSED THE LOC APCH COURSE I HAD DIFFICULTY REACQUIRING THE ARPT. ALL THIS RESULTED IN A VERY POOR APCH BEING FLOWN WITH MAJOR DEVS FROM THE INTENDED GND TRACK. I AM SURE THAT MY SLOW REACTIONS AND 'TUNNEL VISION' WERE FROM FATIGUE. THIS WAS THE SECOND ALL NIGHT FLT IN AS MANY DAYS FOR ME. ALTHOUGH I FELT I HAD HAD ADEQUATE REST PRIOR TO THE FLT. MORE VIGILANCE AND AN ADDED SENSE OF URGENCY IS NEEDED BY CREWS AS THE DAYS BECOME LONGER; AND THE ACCUMULATED SLEEP PATTERN CHANGE MAKES ITSELF KNOWN. I HAD ALWAYS THOUGHT THE FATIGUE ISSUE WAS SOMEWHAT SELF SERVING; BUT I NOW REALIZE THE SERIOUSNESS OF THE ISSUES.