Narrative:

During our approach to ILS runway 8 at burbank, ca, our TCASII displayed numerous air targets in the vicinity of the airport. Approach control was extremely busy as were we completing the preparations for landing, communicating with ATC, flying the approach and responding to the 2-3 TA's sounded within the few mins up to the incident. After intercepting the localizer at 3000 ft, and inside of 'silex,' we received another TA for a TCASII target at our 11 O'clock, below us and climbing. While visually searching for it, the aircraft moved to display -- 300 ft and climbing and closing on our position rapidly. An RA 'monitor vertical speed' was issued by TCASII, and our tvsi indicated red lights below 0 vsi. After several more seconds attempting to visually acquire this closing aircraft, the captain maneuvered a right bank turn approximately 30 degrees right of final approach course. The threat aircraft was never spotted. After turning right, approach control stated that we turn back immediately and that we had caused a loss of separation on an aircraft at our 2 O'clock, opposite direction. I spotted this aircraft and estimate it to have been 1 - 1 1/2 mi away, same altitude. After our turn back towards final, we elected a go around because we were too high for a safe approach due to the maneuvering. We received vector back around for an uneventful second approach and landing. I believe that was a very unsafe situation for a passenger aircraft to be in and that the captain exercised good judgement to maneuver away from the threat. The approach control frequency was overloaded and we were unable to issue a warning of our evasive action.

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Original NASA ASRS Text

Title: AN ACR MLG RESPONDED TO A TCASII 'MONITOR VERT SPD' COMMAND BY TURNING. THIS CREATED A REDUCED SEPARATION WITH ANOTHER ACFT. ALL OF THIS HAPPENED IN THE BUR TFC PATTERN.

Narrative: DURING OUR APCH TO ILS RWY 8 AT BURBANK, CA, OUR TCASII DISPLAYED NUMEROUS AIR TARGETS IN THE VICINITY OF THE ARPT. APCH CTL WAS EXTREMELY BUSY AS WERE WE COMPLETING THE PREPARATIONS FOR LNDG, COMMUNICATING WITH ATC, FLYING THE APCH AND RESPONDING TO THE 2-3 TA'S SOUNDED WITHIN THE FEW MINS UP TO THE INCIDENT. AFTER INTERCEPTING THE LOC AT 3000 FT, AND INSIDE OF 'SILEX,' WE RECEIVED ANOTHER TA FOR A TCASII TARGET AT OUR 11 O'CLOCK, BELOW US AND CLBING. WHILE VISUALLY SEARCHING FOR IT, THE ACFT MOVED TO DISPLAY -- 300 FT AND CLBING AND CLOSING ON OUR POS RAPIDLY. AN RA 'MONITOR VERT SPD' WAS ISSUED BY TCASII, AND OUR TVSI INDICATED RED LIGHTS BELOW 0 VSI. AFTER SEVERAL MORE SECONDS ATTEMPTING TO VISUALLY ACQUIRE THIS CLOSING ACFT, THE CAPT MANEUVERED A R BANK TURN APPROX 30 DEGS R OF FINAL APCH COURSE. THE THREAT ACFT WAS NEVER SPOTTED. AFTER TURNING R, APCH CTL STATED THAT WE TURN BACK IMMEDIATELY AND THAT WE HAD CAUSED A LOSS OF SEPARATION ON AN ACFT AT OUR 2 O'CLOCK, OPPOSITE DIRECTION. I SPOTTED THIS ACFT AND ESTIMATE IT TO HAVE BEEN 1 - 1 1/2 MI AWAY, SAME ALT. AFTER OUR TURN BACK TOWARDS FINAL, WE ELECTED A GAR BECAUSE WE WERE TOO HIGH FOR A SAFE APCH DUE TO THE MANEUVERING. WE RECEIVED VECTOR BACK AROUND FOR AN UNEVENTFUL SECOND APCH AND LNDG. I BELIEVE THAT WAS A VERY UNSAFE SIT FOR A PAX ACFT TO BE IN AND THAT THE CAPT EXERCISED GOOD JUDGEMENT TO MANEUVER AWAY FROM THE THREAT. THE APCH CTL FREQ WAS OVERLOADED AND WE WERE UNABLE TO ISSUE A WARNING OF OUR EVASIVE ACTION.

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.