ACR X NON ADHERENCE TO ATC CLRNC MAINTAIN VISUAL SEPARATION HAD CONFLICT WITH ACR Y. LTSS. UNINTENDED USE OF TCASII.

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VISUAL APCHS TO RWYS 34 AND 35 WERE IN USE. KERNN LOM IS A COMMON FIX FOR BOTH RWY 34 AND 35 ILS APCHS. THE CONVERGING CTRLINES OF RWYS 34 AND 35; EXTENDED BACKWARD; MEET AT KERNN AT NEARLY THE SAME ALT. APCHED SLC FROM THE S AND WE WERE HIGHER THAN NORMAL. SLC APCH POINTED OUT A 727 ON DOWNWIND JUST ABOUT TO TURN L BASE FOR A VISUAL APCH TO RWY 34. WE CALLED TFC IN SIGHT AND WE WERE THEN CLRED FOR A VISUAL APCH TO RWY 35. WE WERE VERY BUSY GETTING FLAPS AND LNDG GEAR DOWN IN ORDER TO LOSE EXCESS ALT. I TEMPORARILY LOST SIGHT OF THE 727 BUT TCASII SHOWED HIM CLOSE TO OUR POS AND ABOUT 1000 FT BELOW US. WE THEN GOT A TA FROM TCASII BUT NO RA. I COULD NOT SPOT THE 727 WHERE I THOUGHT HE SHOULD BE. I THEN GLANCED DOWN AND SAW THE 727 BELOW AND SLIGHTLY AHEAD OF US. WE WERE CONVERGING HORIZLY AND VERTLY. I NOTICED WE WERE LINED UP PERFECTLY FOR BOTH RWYS 34 AND 35 AND THEN THE ADF NEEDLE SWUNG AT KERNN. I TOLD THE FO; WHO WAS FLYING; TO TURN R; OFF THE RWY 35 CTRLINE TO INCREASE OUR SEPARATION. OUR SPD SLOWED AND THE 727 STAYED AHEAD OF US AND OUR LATERAL DISTANCE INCREASED FOR THE REST OF THE WAY TO TOUCHDOWN. THIS RWY CONFIGN COULD BE VERY HAZARDOUS UNLESS POSITIVE STEPS ARE TAKEN TO ENSURE THAT EITHER RWY 34 OR 35 TFC IS AT LEAST A MI AHEAD OF TFC FOR THE OTHER RWY. IN THE FUTURE; WHEN SIMULTANEOUS VISUALS ARE BEING USED FOR RWYS 34 AND 35; I WILL TRACK E OF THE CTRLINE IF USING RWY 35 OR W OF THE CTRLINE FOR RWY 34 UNTIL I AN SURE OF THE POS OF PARALLEL TFC. I HAVE FLOWN INTO SLC MANY TIMES OVER THE YRS. IT IS VERY EASY TO GET LINED UP WITH THE WRONG RWY COMING FROM EITHER N OR S; ESPECIALLY WHEN VISIBILITY IS DOWN. IT IS ESSENTIAL TO ALWAYS BACK UP VISUALS WITH A POSITIVELY IDENTED ILS. PLEASE SEND COPY TO SLC APCH.