FO OF MLG ACR ACFT WAS ALARMED BY THE APCH PROC DURING AN ILS APCH WHEN SIMULTANEOUS APCHS WERE IN PROGRESS WHERE EACH ACFT HAD TO HAVE THE OTHER IN SIGHT DURING THE LAST 6 MI OF THE APCHS.

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ATIS INDICATED THAT SIMULTANEOUS LDA APCHS TO 28R AND ILS APCHS TO 28L WERE IN PROGRESS. WE WERE VECTORED ONTO THE ILS 28L LOC AND HEARD AN ACR HVY (WDB) ON THE LDA. THE CTLR ASKED BOTH OF US IF WE HAD THE OTHER IN SIGHT. ACR WDB RPTED THE RWY BUT COULD NOT ACQUIRE US. WE WERE IN THE CLOUDS AND DID NOT HAVE THE FIELD NOR THE TFC. AT 1800 FT MSL; WE BROKE OUT OF THE CLOUD BASE AND SAW THE RWY. WE MOMENTARILY SAW THE WDB BUT LOST IT IN THE RAGGED CLOUD LAYER; WHICH APPEARED TO BE AT 1600 FT; AS WE GOT CLOSER TO THE ARPT. WHEN WE LOST THE (WDB) I WAS ABOUT TO GET AN RA ON THE TCASII AND WAS PREPARING TO EXECUTE THE ILS 28L MISSED APCH. THE CTLR ASKED BOTH OF US IF WE SAW EACH OTHER AND WE BOTH SAID; 'NEGATIVE.' THE CTLR THEN TOLD (ACR) TO 'GAR; FLY HDG 280 DEGS; AND CLB TO 4000 FT.' THE FREQ WAS SO BUSY THAT WE COULDN'T GET A WORD IN EDGEWISE. WE SWITCHED TO TWR BELOW 1000 FT; AND WERE CLRED TO LAND ON 28R AT 800 FT. SIMULTANEOUS LDA AND ILS APCHS ARE UNSAFE. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR WAS ADVISED THAT APCH CHART 11-3A EXPLAINED THE PROVISIONS AND STIPULATIONS FOR SIMULTANEOUS APCHS WITH THE LDA DME RWY 28R AND ILS RWY 28L. IT MAKES IT PERFECTLY CLR THAT THE ACFT ON THE LDA APCH HAS TO MAKE A VISUAL APCH AFTER 'EPPAR' OR EXECUTE A MISSED APCH BY TURNING R TO A 280 DEG HDG. IN ADDITION; THE TRAILING ACFT ON EITHER APCH HAS TO HAVE THE OTHER IN SIGHT AFTER DEPARTING THE 6 MI FIX.