PHL APCH CTL ISSUES ILS APCH VECTORS IN WHICH THE FLC INTERCEPTS THE FINAL AT THE OM. WITH A TAILWIND AND AN UNSTABLE APCH AND LOC OVERSHOOT; FLC EXECUTES A GAR.

Narrative

PHL APCH CTL VECTORED ME ON HDG OF 070 DEGS AT 2000 FT MSL TO INTERCEPT RWY 9R ILS LOC AND CLRED ME FOR APCH. THIS HDG TOOK ME DIRECTLY TO FAF (KELEE) WITH 20 KT TAILWIND SPD AND ASSIGNED 170 KTS. APCH WAS ARMED AND CAPTURE OF LOC AND GS OCCURRED AT SAME MOMENT AT FAF. ACFT STARTED TO TRACK LOC AND STARTED DSCNT. HOWEVER; ONLY 10 DEG TURN TOWARD LOC AND -800 FPM VERT SPD ON GS OCCURRED BEFORE REVERSION TOOK PLACE. APCH ASKED IF WE HAD PROPER ILS FREQ SET FOR RWY 9R ILS INSTEAD OF RWY 9L ILS SINCE WE WERE NOW L OF COURSE. I RESPONDED WE HAD PROPER FREQ SET AND HAD RWY IN SIGHT AND WE WERE CORRECTING TO CTRLINE OF RWY 9R. HOWEVER; AT APPROX 800 FT AGL; I WAS NOT COMFORTABLE WITH POS OF ACFT AS TO AFFORD SAFE LNDG. SO I COMMANDED FO (PF) TO EXECUTE GAR. HE RESPONDED MOMENTS LATER WITH 'GO AROUND; TOGA; GO AROUND FLAPS' AND A GAR WAS PERFORMED. WE WERE THEN INSTRUCTED TO FLY 180 DEG HDG AND LATER VECTORED BACK TO THE SAME APCH (RWY 9R ILS PHL) AND LANDED. HUMAN PERFORMANCE: BY BEING VECTORED DIRECTLY TO FAF WITH SPD ASSIGNED WITH TAILWIND AT 2000 FT CAUSED THE ACFT SYS TO REVERT TO HDG AND VERT SPD. TOO MUCH HAPPENING IN TOO SHORT A TIME PERIOD FOR CHKS AND XCHKS TO BE PERFORMED. ONCE PROB WAS DISCOVERED; WE WERE IN THE RED ZONE AND THUS THE UNCOMFORTABLE FEELING AROSE. IF I HAD IT TO DO OVER; I WOULD HAVE EXECUTED A GAR AT FIRST RECOGNITION OF PROB RATHER THAN TRY TO SAVE APCH VISUALLY.