HDG TRACK ALTDEV ALT OVERSHOT IN DSCNT.

Narrative

DSNDING FOR AN ILS APCH TO RWY 28L AT PORT COLUMBUS INTL. A BUSY DSCNT DUE TO BEING HELD HIGH BY ATC AND SOME DEV AROUND BUILD-UPS IN AREA. FO WAS FLYING; ATIS CALLED FOR 7 MI VISIBILITY AND ILS/VISUAL APCHS TO RWY 28L/R. AFTER BEING CLRED FOR ILS RWY 28L APCH AND ON AN INTERCEPT HDG; WE QUICKLY CONFIGURED ACFT FOR LNDG BECAUSE WE WERE HIGH (NOT HIGH ENOUGH TO BE CONSIDERED A 'SLAM-DUNK' APCH). WITH ACFT STABILIZED ON AN INTERCEPT HDG AND DSNDING AT ABOUT 1500-1700 FPM TO GS; I DIVERTED MY ATTN TO COMPLETING THE REMAINING CHKLIST ITEMS AND TO TUNING MY NAV COM TO THE APCH FREQ (IT WAS ON RWY 10L ILS FOR DME). FO ELECTED TO USE AUTOPLT TO INTERCEPT APCH. INSTEAD OF TURNING L TO CAPTURE LOC; ACFT TURNED R. AFTER A MOMENT OF CONFUSION; FO DISCONNECTED AUTOPLT AND TURNED BACK L TO RECAPTURE LOC. APCH CTL CALLED AND GAVE US A HDG TO REINTERCEPT ILS. I NOTED WE HAD DSNDED TO 2400 FT. 300 FT BELOW GS INTERCEPT ALT. I DIRECTED FO TO CLB BACK TO 2700 FT. ILS SUBSEQUENTLY FLOWN TO LNDG. RWY WAS VISUALLY ACQUIRED 4-5 MI OUT. PROB CAUSED BY 2 FACTORS. FIRST; DFCG SWITCH IS NORMALLY IN #2 POS WHEN FO IS FLYING. DUE TO USE OF OMEGA IN CRUISE; IT WAS IN #1 POS AND WAS NOT RETURNED TO #2 POS DURING DSCNT. SECOND; BY USING #1 NAV RADIO FOR DME; AUTOPLT ATTEMPTED TO INTERCEPT BACK COURSE LOC FOR RWY 28R. SECONDARY FACTORS INCLUDED FATIGUE. AT THE END OF A LONG 12 HR DAY; I THINK WE WERE BOTH 1/2 STEP BEHIND THE ACFT. ALSO; THE BUSY COCKPIT OF THE S-80 CONTRIBUTED. MORE THAN ANY OTHER ACFT I'VE FLOWN; THE S- 80 REQUIRES THE PNF TO TAKE HIMSELF TEMPORARILY OUT OF THE LOOP TO COMPLETE REQUIRED CHKLIST AND PROCEDURAL ITEMS. I'VE ONLY BEEN ON THE ACFT 4 MONTHS; AND I'M STILL TRYING TO FIND THAT PERFECT PLACE IN THE APCH TO DO THIS. OBVIOUSLY; I DID NOT FIND IT THIS TIME. FINALLY; THE FO; THOUGH SENIOR ON THE EQUIP; IS SOMEWHAT RELUCTANT TO USE THE AUTO FUNCTIONS AVAILABLE ON THE ACFT; SUCH AS AUTO APCHS AND OMEGA NAV. THIS SHOULD HAVE BEEN MY CLUE TO WATCH HIS WORK A BIT MORE CLOSELY. SUPPLEMENTAL INFO FROM ACN 276054: AT A BUSY TIME WITH SEVERAL THINGS COMING TOGETHER ALL AT ONCE JUST OUTSIDE THE FAF; OVER CONFIDENCE IN AUTOMATION AND FAILURE TO PROPERLY MONITOR THAT THE AUTOFLT SYS DID WHAT I EXPECTED IT TO DO ALLOWED A DEV TO OCCUR. A CHK OF THE DFGL SWITCH POS WAS RECENTLY ADDED TO OUR DSCNT CHKLIST. NOW THAT THE MAJORITY OF OUR AIRPLANES HAVE AN OMEGA INSTALLED ON THE CAPT'S SIDE WHICH CAUSES THE DFGL SWITCH TO BE PLACED OUT OF ITS NORMAL POS WHEN THE FO IS FLYING; I HAVE LEARNED FIRST HAND THE IMPORTANCE OF ENSURING THAT THIS STEP OF THE DSCNT CHKLIST IS ACCOMPLISHED.