Narrative:

A flight from columbia, mo, to stl. WX conditions very good. We were on a 10 mi final for runway 12R at stl. The winds were 210 degrees at 10 KTS. We were asked to change to runway 13. We accepted the clearance but we were required to make a large s-turn to maintain separation and wake turbulence avoidance from a B737 on visual approach to runway 12L. The B737 was on an extremely high final making s-turns to lose altitude. We went under the B737 at a 500 ft vertical separation. The proximity of runway 13 to runway 12L is very close so we s-turned back to intercept a short final. As we crossed the threshold at a normal speed, we experienced both a roll and stall indication. We executed an immediate go around with no further incident. Factors: 1) close proximity of runways with 10 KT wind that pushed the B737's wake in our path. 2) B737's approach such that we were unable to position ourselves above his position. 3) I should not have accepted the runway change with B737 being a known conflict. 4) we should have executed a go around earlier during our approach. Callback conversation with reporter revealed the following information: reporter said he would not ever do this again with the same circumstances abiding. The position of the other aircraft was the biggest factor, with the surface wind being second. The tower controller initiated the runway change, with the BA3200 being changed to the north tower frequency after he had stated, 'traffic in sight.' the controller issued the usual 'caution, wake turbulence' which doesn't really solve the problem when attempting to squeeze another aircraft in or out of the airport.

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Original NASA ASRS Text

Title: A BA32 JETSTREAM ENCOUNTERED WAKE TURB FROM A PRECEDING B737. THE LTT WAS ON APCH TO RWY 12R AND WAS CHANGED TO RWY 13. THE PIC HAD TO CROSS UNDER THE B737 ON A HIGH APCH TO RWY 12L, EXPERIENCING AN NMAC. THE WIND WAS FROM THE SW, WHICH CARRIED THE ALREADY LNDG B737'S WAKE TURB ACROSS TO RWY 13. THE BA3200 HIT THAT WAKE AT 100 FT ABOVE THE THRESHOLD, GOING AROUND TO RECOVER FROM A ROLL AND A STALL.

Narrative: A FLT FROM COLUMBIA, MO, TO STL. WX CONDITIONS VERY GOOD. WE WERE ON A 10 MI FINAL FOR RWY 12R AT STL. THE WINDS WERE 210 DEGS AT 10 KTS. WE WERE ASKED TO CHANGE TO RWY 13. WE ACCEPTED THE CLRNC BUT WE WERE REQUIRED TO MAKE A LARGE S-TURN TO MAINTAIN SEPARATION AND WAKE TURB AVOIDANCE FROM A B737 ON VISUAL APCH TO RWY 12L. THE B737 WAS ON AN EXTREMELY HIGH FINAL MAKING S-TURNS TO LOSE ALT. WE WENT UNDER THE B737 AT A 500 FT VERT SEPARATION. THE PROX OF RWY 13 TO RWY 12L IS VERY CLOSE SO WE S-TURNED BACK TO INTERCEPT A SHORT FINAL. AS WE CROSSED THE THRESHOLD AT A NORMAL SPD, WE EXPERIENCED BOTH A ROLL AND STALL INDICATION. WE EXECUTED AN IMMEDIATE GAR WITH NO FURTHER INCIDENT. FACTORS: 1) CLOSE PROX OF RWYS WITH 10 KT WIND THAT PUSHED THE B737'S WAKE IN OUR PATH. 2) B737'S APCH SUCH THAT WE WERE UNABLE TO POS OURSELVES ABOVE HIS POS. 3) I SHOULD NOT HAVE ACCEPTED THE RWY CHANGE WITH B737 BEING A KNOWN CONFLICT. 4) WE SHOULD HAVE EXECUTED A GAR EARLIER DURING OUR APCH. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR SAID HE WOULD NOT EVER DO THIS AGAIN WITH THE SAME CIRCUMSTANCES ABIDING. THE POS OF THE OTHER ACFT WAS THE BIGGEST FACTOR, WITH THE SURFACE WIND BEING SECOND. THE TWR CTLR INITIATED THE RWY CHANGE, WITH THE BA3200 BEING CHANGED TO THE N TWR FREQ AFTER HE HAD STATED, 'TFC IN SIGHT.' THE CTLR ISSUED THE USUAL 'CAUTION, WAKE TURB' WHICH DOESN'T REALLY SOLVE THE PROB WHEN ATTEMPTING TO SQUEEZE ANOTHER ACFT IN OR OUT OF THE ARPT.

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.