POTENTIAL CONFLICT DURING RADAR VECTORING FOR IAP ILS PARALLEL SIMULTANEOUS ILS APCH PROC.

Narrative

DTW APCH CTL WAS WORKING OUR FLT FROM ALB TO DTW. WE WERE AT 5000 FT AND BEING VECTORED FOR A RWY 21L ILS. I HAD THE AUTOPLT SET UP FOR THIS APCH. DTW WAS ALSO USING RWY 21R PARALLEL APCHS. WE WERE AT 220 KTS AND SLOWING WHEN THE CTLR TURNED US L TO A 250 DEG HDG. HE SAID 'MAINTAIN 5000 FT UNTIL ESTABLISHED; THEN CLRED FOR A 21L ILS APCH.' THE ONLY PROB WAS HE TURNED US WAY TOO LATE AND WE ENDED UP ON THE W SIDE OF THE 21L LOC. WHEN WE WENT THROUGH THE LOC; THE AUTOPLT CAPTURED THE LOC AND GS. IT TURNED THE ACFT TO A 180 DEG HDG TO REINTERCEPT THE 21L LOC AND BEGAN TO DSND ON THE GS. AT ABOUT 4700 FT MSL THE TCASII ALERTED US TO CLB. ALSO AT THIS TIME; THE APCH CTLR STATED 'MAINTAIN 5000 FT UNTIL ESTABLISHED ON THE 21L LOC.' I TOOK MANUAL CTL OF THE ACFT; MAINTAINED 5000 FT AND INTERCEPTED THE 21L LOC. I THEN CONDUCTED A NORMAL APCH. WHEN THE TCASII ALERT SOUNDED; WE DID ESTABLISH VISUAL CONTACT WITH OUR TFC. THE PROB HOWEVER; WAS THE FACT THAT THE FINAL CTLR TURNED US WAY TOO LATE AND NEVER ADVISED US OF ANY TFC CONFLICT UNTIL WE GOT THE TCASII ALERT. WITHOUT ANY VISUAL OR ADF TYPE OF REFS; WE REALLY HAVE NO WAY OF KNOWING WHEN WE ARE COMING UP ON THE 21L LOC. THEREFORE; I THINK IT IS MOST IMPORTANT THAT THE LCL CTLRS GIVE US THE PROPER LEAD TIME TO CORRECTLY INTERCEPT A PARALLEL TYPE APCH LOC.