NMAC DURING VISUAL APCH. MULTIPLE RWY OP PARALLEL RWYS.

Narrative

PHX WAS OPERATING VISUAL APCHS TO 26L AND 26R. APPARENTLY IT IS NORMAL PROC AT PHX TO SEQUENCE HVY AND NON HVY ACFT SIMULTANEOUSLY TO PARALLEL RWYS. CAPT WAS PF. PHX APCH ADVISED TFC; A WDB; WHILE WE WERE ON BASE LEG. WE RPTED TFC AND ARPT IN SIGHT. WE WERE THEN CLRED VISUAL APCH TO RWY 26R. AT APPROX 900 AGL CAPT LOOKED INSIDE TO CONFIRM GEAR AND FLAPS. WHILE LOOKING DOWN; TCASII ISSUED RA WITH 'DSND; DSND.' CAPT LOOKED AT HIS VSI AND SAW TARGET ACFT MERGED WITH HIS ACFT AND MINUS 100 FT. CAPT ADDED MAX PWR AND CLBED AT 20 DEGS NOSE UP. THIS ACTION CAUSED THE RA TO CEASE. WE WERE THEN CLR OF TFC. DURING GAR WHILE RESPONDING TO RA; THE WDB LOOKED EXTREMELY CLOSE. WE WERE UNSURE WHETHER THE RA WAS FOR THE WDB OR ANOTHER UNSEEN ACFT. DURING THE GAR; THE CTLR IN THE TWR (WHO WAS ALSO THE TWR SUPVR) MADE SEVERAL COMMENTS INDICATING HE WAS NOT HAPPY THAT WE WENT AROUND. SUBSEQUENT APCH AND LNDG WERE UNEVENTFUL. IN A TELEPHONE CONVERSATION BTWN THE CAPT AND THE CTLR/SUPVR AFTER THE FLT; THE CTLR/SUPVR REFUSED TO GIVE HIS NAME. NEVERTHELESS; HE WAS APOLOGETIC AND REGRETTED HIS REMARKS DURING THE GAR. THE CTLR ALSO INDICATED THAT RA'S ARE COMMON IN PHX. I BELIEVE IT. THIS VISUAL PROC NEEDS FURTHER CONSIDERATION AND EVALUATION. THERE IS NO ROOM FOR ERROR AS PRESENTLY PRACTICED.