CARGO; NON TCASII EQUIPPED B757 FLC INITIATES PRECAUTIONARY AVOIDANCE MANEUVER ON FINAL APCH TO OAK ARPT WHEN OBSERVING A C172 CROSS IN FRONT OF AND BENEATH THE B757; UNDERFLYING SFO CLASS B AIRSPACE. ATC OBSERVED C172 AFTER ALERTED BY THE FLC. PIC CONCERNED THAT NON TCASII EQUIPPED CARGO ACFT ARE AT PROTECTION RISK FROM OTHER NON TCASII ACFT.

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WE (ACFT X) WERE INBOUND TO OAK FROM THE E. I WAS THE CAPT; THE FO WAS FLYING THE AIRPLANE ON AUTOPLT. WE WERE AT 5000 FT ON A VECTOR TO INTERCEPT THE LOC TO RWY 29 OUTSIDE OF THE FAF. APPROX 20 MI FROM THE ARPT; I RPTED THE ARPT IN SIGHT TO BAY APCH. THE CTLR CLRED US FOR A VISUAL APCH WITH THE STANDARD RESTR TO CROSS 6 MI FROM OAK AT OR ABOVE 2000 FT. THE FO INITIATED DSCNT TO 2000 FT AT 250 KTS. HE WAS MAKING SMALL HDG CHANGES TO THE R TO INTERCEPT THE FINAL APCH INSIDE THE FAF AND AS A RESULT WE WERE AT 5-15 DEGS OF R BANK MOST OF THE TIME. HIS ATTN WAS PRIMARILY ON THE ARPT WHICH WAS TO THE R OF THE AIRPLANE'S NOSE. I WAS MAKING ENTRIES IN THE FMC; LOOKING UP THE TWR FREQ; AND MONITORING OUR PROGRESS. WHEN WE WERE 10-12 MI WE WERE APCHING 2000 FT ON A WESTERLY HDG. I LOOKED STRAIGHT AHEAD AND SAW A C172/182 (ACFT Y) ON A NORTHERLY HDG AT 11:30 O'CLOCK POS RELATIVE TO OUR NOSE; APPROX 1-2 MI AHEAD. THE CESSNA STOOD OUT AGAINST THE BACKGND OF THE WATER AT THE SOUTHERN END OF THE BAY; WHICH WAS BACKLIT BY THE SETTING SUN. THE CTLR WAS TALKING TO SEVERAL AIRPLANES BUT HE HAD NOT GIVEN US ANY TA'S. NEITHER THE FO NOR EITHER OF THE 2 JUMP SEATERS HAD SEEN THE AIRPLANES. I POINTED THE AIRPLANE OUT TO THE FO. IT SOON BECAME APPARENT FROM HIS CONSTANT BEARING AND RAPIDLY DECREASING RANGE THAT WE WERE ON A COLLISION COURSE. THE FO DISCONNECTED THE AUTOPLT; LEVELED THE WINGS; AND STARTED A SLIGHT CLB. WE PASSED APPROX 1000-1500 FT BEHIND THE CESSNA AND 100-200 FT HIGHER THAN HIM. I TOLD THE CTLR WE WERE CLBING TO AVOID AN AIRPLANE. HE SAID; 'OH I SEE HIM NOW. HE'S AT 2100 FT. PROBABLY LNDG AT HAYWARD.' THE CESSNA APPEARED TO BE FLYING JUST OUTSIDE THE EDGE OF THE CLASS B AIRSPACE. OUR AIRPLANE IS ONE OF THE FEW LARGE AIRPLANES IN THIS COUNTRY NOT EQUIPPED WITH TCASII. BECAUSE IT IS A CARGO AIRPLANE; THE FAA HAS ALLOWED THE OWNER TO OPERATE IT WITHOUT TCASII. RADAR FAILED TO PROVIDE PROTECTION AGAINST A MIDAIR IN THIS CASE. THE ONLY THING THAT PREVENTED A TRAGEDY WAS THE OUTMODED PRINCIPLE OF 'SEE AND BE SEEN.' THE FAA'S FAILURE TO MANDATE TCASII IN CARGO AIRPLANES WILL RESULT IN A MIDAIR SOMEDAY.