PA60 ON STRAIGHT IN VISUAL APCH FAILED TO FOLLOW RPTR'S ACFT REQUIRING EVASIVE MANEUVER BY THE FLC TO AVOID THE ACFT WHILE ON BASE LEG. THE CTLR ATTEMPTED TO HANDLE SIT BY PUTTING THE PA60 ON A DIFFERENT RWY.

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WE CONTACTED IPT TWR AND CONFIRMED THE VISUAL APCH TO RWY 27 AND THAT WE WOULD BE ENTERING ON A R DOWNWIND LEG. THE TWR INSTRUCTED US TO CALL ON THE DOWNWIND LEG WHICH WE SUBSEQUENTLY DID. WE WERE THEN CLRED; #1; TO LAND ON RWY 27. AS WE SLOWED ON THE DOWNWIND LEG AND CONFIGURED THE ACFT FOR LNDG; PIPER PA60; ACFT #2; (AEROSTAR); CONTACTED THE IPT TWR AND STATED HE WAS 7 MI E OF IPT FOR A STRAIGHT IN VISUAL APCH TO RWY 27. HE WAS ADVISED THAT WE (DORNIER 328) WERE MAKING A R TFC VISUAL APCH TO RWY 27 AND WOULD SOON BE TURNING ONTO THE BASE LEG AND THAT WE WERE #1 FOR THE FIELD. HE STATED HE DID NOT YET SEE US. IPT ASKED IF WE WERE IN THE TURN TO BASE YET AND WE RESPONDED THAT WE HAD JUST MADE THAT TURN AND WE CONFIRMED THAT WE WERE STILL CLRED TO LAND. IN THE MEANTIME; ACFT #2 CONTINUED STRAIGHT TOWARD RWY 27 AND FINALLY ADVISED HE SAW US BY COMMENTING ABOUT A BOMBER PATTERN. NOW; ACFT #2 WAS PASSING UNDER OUR ACFT AS WE WERE ABOUT TO START OUR TURN TO FINAL. AT THIS POINT THE IPT TWR CLRED ACFT #2 TO LAND ON RWY 30. IN ORDER TO AVOID THE OTHER ACFT WE HAD TO BREAK OFF THE APCH. JUST AS WE INITIATED A TURN AWAY FROM AND ABOVE ACFT #2; OUR TCASII GAVE US A TFC AVOIDANCE WARNING. WE ADVISED TWR WE WERE ABANDONING THE APCH DUE TO THE CONFLICT AND WOULD DEPART TOWARD THE SE; AWAY FROM THE HIGH TERRAIN; AND MAKE A L TURN BACK ONTO A VISUAL FINAL FOR RWY 27. THE TWR CONCURRED AND ASKED US TO RPT RE-ESTABLISHED; WHICH WE DID. WE ALSO ASKED IF THERE WAS ANY MORE TFC WE SHOULD KNOW ABOUT. THERE WAS NONE AND WE LANDED WITHOUT FURTHER INCIDENT. TO OUR KNOWLEDGE; IPT TWR DID NOT ISSUE INSTRUCTIONS TO ACFT #2 TO TAKE APPROPRIATE ACTIONS TO AVOID CREATING THIS TFC CONFLICT. ALSO; ACFT #2 TOOK NO ACTION TO AVOID THE CONFLICT EVEN THOUGH HE HAD BEEN INFORMED HE WAS NOT #1 FOR THE ARPT.