A B727 FREIGHTER SO FLC RPT ON AN NMAC WITH A LIGHT TWIN WITHIN THE PHX TCA CLASS B AIRSPACE. NO TFC RPTS.

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ACFT WAS BEING FLOWN ON COURSE ON THE FOSSL 4 ARR TO PHX AT 8000 FT MSL. VISIBILITY WAS HINDERED BY SETTING SUN AND HAZE. NO RPTS WERE GIVEN BY APCH CTL ABOUT ANY TFC IN THE AREA (CLASS B AIRSPACE). WHILE LOOKING FOR TFC; AT PM17 LCL THE CAPT TOOK CTL FROM THE FO (PF) AND IMMEDIATELY INITIATED A THRUST REDUCTION TO IDLE PWR AND TURNED L TOWARDS SE. THE FO DID NOT SEE THE TFC UNTIL EVASIVE ACTION WAS TAKEN. THE FO HAD DIFFICULTY SEEING DUE TO SHINING BRIGHT SUN; AND ALSO HEAD IN AND OUT OF COCKPIT DUE TO HIS PF TASKS. CAPT INITIATED EVASIVE ACTION AS HE SAW TWIN ENG LIGHT ACFT AT SAME ALT COMING FROM L ON WHAT APPEARED TO BE AT APPROX A WSW HDG. ACFT APPEARED TO MAKE NO CHANGE IN HDG AND ALT AND WAS ALMOST CLOSE ENOUGH; AS PASSING IN FRONT OF US; TO SEE HIS REGISTRATION N-NUMBER. WE MAINTAINED 8000 FT DURING ENTIRE EVASIVE MANEUVER. I SAW ACFT AS IT WAS AT APPROX OUR 11 O'CLOCK POS. APCH CTL WAS NOTIFIED AT APPROX 16 DME ON THE ARR (195 DEG COURSE) BY CAPT THAT WE HAD A NEAR MISS. CTL RESPONDED WITH NO SENSE OF EITHER URGENCY OR IMMEDIATE CONCERN OTHER THAN TO DIRECT A 180 DEG HDG. NO OTHER INFO WAS ASKED FOR BY APCH.