LTT ENCOUNTERS EXTREME ROLL ACTION ON INTERCEPTING GS BEHIND 757.

Narrative

VECTORED TO APCH ILS 4 AT 3000 FT. WE INTERCEPTED LOC OUTSIDE GRENE. WE HAD NOT INTERCEPTED THE GS YET; IT WAS ABOVE US STILL. AS THE ACFT INTERCEPTED THE SLOPE; THE ACFT ROLLED VIOLENTLY TO A 40 DEG ANGLE OF BANK; UNCOMMANDED. (R TURN). WE WERE TOLD WE HAD 4 MI SEPARATION BEHIND A 757. APPARENTLY; THE 757 WAS FOLLOWING THE GS DOWN AND WE INTERCEPTED FROM UNDERNEATH. SINCE WE ALREADY WENT THROUGH IT; WE COULD AVOID FURTHER BY STAYING ABOVE GLIDE PATH SLIGHTLY. WE DECLINED TO BE TAKEN OFF THE APCH. MY SOLUTION TO THIS PROB IS TO VECTOR 757'S TO INTERCEPT AT LOWER ALTS THAN OTHER ACFT. BY FLYING THE GS 1 DOT HIGH; WE CAN AVOID WAKE TURB. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATES THEY WERE FLYING A BE 1900 COMMUTER. THE COMMUTERS ARE VECTORED FOR THE NORMAL PATTERN BUT THE JETS USUALLY COME STRAIGHT IN FROM THE SW. THE JETS ARE INTERCEPTING THE GLIDE PATH ABOUT 5 MI PRIOR TO THE COMMUTER ACFT AND FROM A HIGHER ALT. RPTR WOULD LIKE TO SEE A CHANGE SO THAT EVERYONE IS BROUGHT INTO THE GS AT THE SAME ALT. KNOWING TFC AHEAD; THE ACFT CAN REMAIN SLIGHTLY ABOVE THE GS.