APCH EVALUATION.

Narrative

ATC ASKED IF WE COULD ACCEPT LDA DME RWY 28R. WE SAID YES AND CAREFULLY READ APPROPRIATE BULLETIN. CAPT WAS FLYING AND ATC VECTORED US ONTO THE APCH. AUTOPLT INTERCEPTED AND HAD DIFFICULT TIME JERKING L AND R AS LDA SIGNAL WAS UNSTABLE. AFTER CAPTURE; APCH CTL TURNED US N OFF THE LDA. THEN THEY VECTORED US BACK TO LDA. STILL AT 6000 FT; INSIDE AADAM. SENSING AN IMMINENT MISSED APCH WE ASKED FOR LOWER. FINALLY CLRED FOR APCH. ATC SLOWED US TO 150 KTS BUT OUR MINIMUM WAS 153 KTS. ATC TOLD US A B757 WOULD BE OFF OUR L. BROKE OUT AT 1900 FT TO 2000 FT AND OBSERVED A B757 OFF OUR L; BARELY OFF OUR WINGTIP. MAYBE WE WERE 200 FT AHEAD. WHERE WAS THE PROMISED 3/4 MI STAGGER PROMISED IN THE BULLETIN? WE WERE IN THE LEAD POS BUT THE LDA DME RWY 28R DOES NOT LINE UP WITH THE RWY. I HAD TO MANEUVER FROM LUCSS TO RWY 28R WITHOUT GETTING TOO CLOSE TO THE B757 OFF MY L. OBSERVATIONS LDA DME RWY 28R APCH: 1) ATC MUST PROVIDE MINIMUM 3/4 MI STAGGER. 2) SFO ATC NEEDS AN APCH MONITOR POS TO MAKE CERTAIN OF SEPARATION. 3) SPD CTL AND SEQUENCING NEEDS TO BE IMPROVED TO ALLOW PROPER SEPARATION. 4) IF PLTS CANNOT BE ASSURED OF STAGGER; THIS APCH PLAN WILL FAIL. WITHOUT SEPARATION IT IS UNSAFE.