THE RPTR CAPT IN THE B737-300 EXPERIENCED A TCASII RA GENERATED BY A KC135 TANKER THE CTLR HAD POINTED OUT. THE RPTR ACCOMPLISHED AN EVASIVE DSCNT. WHEN THE CONFLICT CLRED THE RPTR RESUMED THE APCH FOR THE LNDG.

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CAPT WAS THE PF AND FO WAS THE PNF. FLT X ENTERED THE PHX AREA ON THE ARLIN 9 ARR. THE APCH CTLR INITIATED A RADAR VECTOR FOR A DOWNWIND ENTRY INTO THE PHX AREA APPROX BTWN ALEYS AND TUKEE INTXNS. AFTER AN EASTERLY HDG; HE TURNED FLT X TO A N HDG AND CLRED US TO MAINTAIN 3000 FT. AT THAT POINT HE POINTED OUT TFC COMING FROM THE N ON A SOUTHERLY HDG. HE ADVISED US THAT THE TFC WAS A KC135 AND THAT HE WOULD BE RESTR ABOVE US AT 4000 FT. THE CTLR ALSO REQUESTED THAT WE REDUCE OUR SPD TO FOLLOW A B757 (WE WERE 4 MI BEHIND). AT THIS POINT OF TIME; THE POS OF THE ACFT WERE THE FOLLOWING: THE B757 WAS ON (APPROX) 5-8 MI FINAL FOR RWY 26R PHX; WE WERE ON (APPROX) 12 MI L BASE ENTRY TO RWY 26R PHX; AND THE KC135 WAS 11-15 MI NE OF PHX. SHORTLY LATER; WE WERE VECTORED AGAIN TO JOIN THE RWY 26R FINAL APCH COURSE; AT WHICH TIME WE BEGAN TO PICK UP THE KC135 ON TCASII. MY ACFT SPD AND CONFIGN WAS THAT OF 150 KTS; FLAPS 15 DEGS; GEAR DOWN; AUTOPLT ENGAGED; AND TRACKING IN ON THE LOC. OUR TCASII DISPLAYED THAT KC135 TFC HAD INITIATED A DSCNT; THAT WE CONFIRMED VISUALLY. I REMEMBER COMMENTING TO MY FO SEVERAL TIMES THAT 'HE IS DSNDING DOWN ONTO US.' AT THAT POINT; I DISENGAGED THE AUTOPLT AND AUTOTHROTTLES AND PREPARED TO CHANGE COURSE AND ALT. I INITIATED AN IMMEDIATE COURSE/ALT CHANGE JUST PRIOR TO THE AURAL TCASII ADVISORIES. I POSITIONED THE ACFT FROM A NORMAL APCH ATTITUDE TO A 10-15 DEG NOSE DOWN ATTITUDE WITH PWR OFF. I HAD A GOOD VISUAL CONTACT WITH THE TERRAIN; THE ARPT TFC AREA; AND THE INBOUND KC135 AT ALL TIMES. THE LAST READOUT ON THE TCASII THAT I REMEMBERED WITH REF TO THE KC135 WAS THAT HE WAS MOVING DOWNWARD WITH 400 FT SEPARATION. AFTER THE KC135 PASSED OVER TOP OF US; I CLB TOWARDS THE GS PATH AND PROCEEDED TO LAND ON RWY 26R. ON SHORT FINAL; I ADVISED PHX TWR OF THE SIT. AFTER LNDG; I REQUESTED THE PHONE NUMBER OF THE TWR.