A DISPLAY OF FLC PLT BEHAVIOR INADEQUATE HUMAN RESOURCES WHEREIN PIC; PF; EXHIBITS A TEMPORARY LOSS OF MANUAL SKILLS DURING A SPD DEV AND HDG TRACK DEV.

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DURING DSCNT FROM 10000 FT TO 6000 FT; I EITHER LEFT MODE CTL PANEL IN THE 'VERT SPD' MODE OR IT REVERTED FROM A 'LEVEL CHANGE' TO A 'VERT SPD' MODE SOMEWHERE DURING DSCNT. IN ANY CASE; AT APPROX 8000 FT I NOTICED THE IAS AT 290 KIAS DURING AUTOPLT DSCNT. I IMMEDIATELY DISCONNECTED AUTOPLT AND CORRECTED THE DEV MANUALLY. AFTER REESTABLISHED ON CORRECT PROFILE; APCH CTL SET US UP FOR A SHORT TURN IN ILS 28L APCH. AUTOPLT WAS BEING USED; BUT LOC MOVEMENT RATE AND ANGLE EXCEEDED CAPTURE CAPABILITY AND WE DROVE THROUGH THE LOC. WE ASKED FOR A VECTOR TO REINTERCEPT. AFTER ANOTHER HIGH ASPECT ANGLE VECTOR CLOSE IN WITH SAME RESULTS; I MANUALLY FLEW ACFT TO PROVIDE MY OWN INTERCEPT AND LEVELED OFF UNTIL ESTABLISHED ON APCH. IT BECAME OBVIOUS WE WERE GOING TO INTERCEPT LOC INSIDE FAF; SO WE WENT AROUND AND EXECUTED ANOTHER ILS APCH UNEVENTFULLY. CONTRIBUTING WAS OVER RELIANCE ON AUTOFLT SYS AND POOR XCHK. FATIGUE AND DIET WAS ALSO A FACTOR. SITUATION OCCURRED AT END OF 12 HR DAY WITH NO TIME TO EAT AND WAS PRECEDED BY 5 OTHER RATHER BRUTAL 12-13 HR DAY DOMESTIC SHORT HAUL MULTIPLE LEG DUTY PERIODS.