Narrative:

On descent into miami, we encountered a very abrupt jolt as we were descending over some low level buildups. I attributed this jolt to the WX. We rolled approximately 10 degrees of bank and I would liken it to moderate turbulence. Within 15 seconds we hit another jolt just as strong. That rolled us into approximately 20 degrees of bank. About 10 seconds later we really got hit and we rolled to about 30-35 degrees of bank. On the first 2, autoplt was engaged. After third instance I disconnected everything thinking we had a yaw damper/rudder problem, however, there were no indications of that internally. I applied fairly aggressive roll inputs to level wings. The first officer asked miami approach what kind of traffic we were following and she said we were 6 mi behind a B757. (It may have been 5 mi, but I'm pretty sure it was 6 mi). We advised that we were experiencing a very turbulent ride from his wake and approach acknowledged same. I just returned from my annual P.C. And had just practiced my advanced maneuvers training, and I must say I really thought we were in a potential rollover situation, even though we only rolled about 30-35 degrees. It certainly got my attention, at no time did miami approach advise us that we were following a B757. As a matter of fact they were too busy vectoring aircraft for a localizer approach to runway 30 (that had 2 cells on the localizer just outside the FAF). To accommodate departure on runway 27. We refused to accept the runway 30 approach, but it was only after 2 or 3 requests for runway 27R (no WX), and only then did they acquiesce saying that all departures were now gone. Callback conversation with reporter revealed the following information: reporter was a participant in the wake turbulence callback program.

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Original NASA ASRS Text

Title: B737-300 RPTR EXPERIENCED WAKE TURB FROM B757 WHO WAS 5 MI AHEAD OF HIM ON APCH TO MIA. ACFT RECEIVED 2 HVY JOLTS AND ROLLED 35 DEGS SEVERAL TIMES.

Narrative: ON DSCNT INTO MIAMI, WE ENCOUNTERED A VERY ABRUPT JOLT AS WE WERE DSNDING OVER SOME LOW LEVEL BUILDUPS. I ATTRIBUTED THIS JOLT TO THE WX. WE ROLLED APPROX 10 DEGS OF BANK AND I WOULD LIKEN IT TO MODERATE TURB. WITHIN 15 SECONDS WE HIT ANOTHER JOLT JUST AS STRONG. THAT ROLLED US INTO APPROX 20 DEGS OF BANK. ABOUT 10 SECONDS LATER WE REALLY GOT HIT AND WE ROLLED TO ABOUT 30-35 DEGS OF BANK. ON THE FIRST 2, AUTOPLT WAS ENGAGED. AFTER THIRD INSTANCE I DISCONNECTED EVERYTHING THINKING WE HAD A YAW DAMPER/RUDDER PROB, HOWEVER, THERE WERE NO INDICATIONS OF THAT INTERNALLY. I APPLIED FAIRLY AGGRESSIVE ROLL INPUTS TO LEVEL WINGS. THE FO ASKED MIAMI APCH WHAT KIND OF TFC WE WERE FOLLOWING AND SHE SAID WE WERE 6 MI BEHIND A B757. (IT MAY HAVE BEEN 5 MI, BUT I'M PRETTY SURE IT WAS 6 MI). WE ADVISED THAT WE WERE EXPERIENCING A VERY TURBULENT RIDE FROM HIS WAKE AND APCH ACKNOWLEDGED SAME. I JUST RETURNED FROM MY ANNUAL P.C. AND HAD JUST PRACTICED MY ADVANCED MANEUVERS TRAINING, AND I MUST SAY I REALLY THOUGHT WE WERE IN A POTENTIAL ROLLOVER SIT, EVEN THOUGH WE ONLY ROLLED ABOUT 30-35 DEGS. IT CERTAINLY GOT MY ATTN, AT NO TIME DID MIAMI APCH ADVISE US THAT WE WERE FOLLOWING A B757. AS A MATTER OF FACT THEY WERE TOO BUSY VECTORING ACFT FOR A LOC APCH TO RWY 30 (THAT HAD 2 CELLS ON THE LOC JUST OUTSIDE THE FAF). TO ACCOMMODATE DEP ON RWY 27. WE REFUSED TO ACCEPT THE RWY 30 APCH, BUT IT WAS ONLY AFTER 2 OR 3 REQUESTS FOR RWY 27R (NO WX), AND ONLY THEN DID THEY ACQUIESCE SAYING THAT ALL DEPS WERE NOW GONE. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR WAS A PARTICIPANT IN THE WAKE TURB CALLBACK PROGRAM.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.