PLTDEV.

Narrative

WE WERE CLRED HUSKY VISUAL APCH FOR LNDG ON RWY 16L -- FOLLOWING BY 4-5 MI AN ACR X 757 LNDG ON RWY 16R. WE HAD BEEN ADVISED OF AND HAD SEEN ACR Z OVER THE BAY; AND THEY HAD BEEN INSTRUCTED TO FOLLOW US ON THE VISUAL APCH FOR LNDG ON RWY 16R. WE WERE TRACKING THE ILS PER THE SEA 29- 2 PAGE (TO RWY 16R) AND PREPARING TO TRANSITION TO THE RWY 16L CTRLINE (APPROX 8-10 MI OUT) WHEN WE WERE PASSED APPROX 500 FT ON THE R BY THE ACR Z FLT. WE RECEIVED A TA AT THE SAME TIME. THE ACR X AND THE ACR Z BOTH LANDED ON RWY 16R PRIOR TO OUR LNDG ON RWY 16L (BOTH HAD TO WAIT FOR OUR LNDG TO CROSS RWY 16L). I BELIEVE THAT THE ACTIONS BY THE ACR Z CREW WERE IMPROPER AND PLACED NOT ONLY OUR ACFT BUT THEIRS IN A POTENTIALLY DANGEROUS SIT. MY REASONING: THE HUSKY VISUAL DOES NOT REF SIMULTANEOUS APCHS -- NOR WERE WE ADVISED OF SAME: WE WERE GREATLY SURPRISED BY THE TA AND THE APPEARANCE OF THE ACR Z TO OUR R AT A CRITICAL PHASE OF THE APCH: THE ACR Z CREW PLACED THEIR ACFT IN A POTENTIALLY HAZARDOUS SIT UNNECESSARILY BY CLOSING EXTREMELY CLOSE BEHIND THE B757 -- WHOSE WAKE PROB IS WELL-KNOWN. DURING MY CONVERSATION WITH ATC CTLRS ON THE PHONE LATER -- THEY WERE SURPRISED TO FIND OUT THAT IF WE HAD GOTTEN AN RA FROM TCASII WE WOULD HAVE FOLLOWED IT DESPITE KNOWING THE ACR Z FLT WAS BEHIND US. MOST PLTS ASSUME THAT APCHS TO RWY 16L AND RWY 16R WILL BE STAGGERED -- WITH NO PASSING ALLOWED. I RECEIVED SEVERAL COMMENTS FROM PAX ABOUT THE CLOSE PROX OF THE FLT AS IT PASSED US. THANKS.