Narrative:

At 8000 ft on the west palm beach surfn 7 arrival (radial 025 degrees at 20 DME), we encountered pop-up TCASII traffic at the 12 O'clock position, 400 ft below. We received an immediate TA and attempted to contact approach to verify traffic with no success. We shortly thereafter received an RA with TCASII commands for an immediate climb no less than 2000 FPM. Power was applied and climb initiated to 8400 ft. With subsequent avoidance maneuver, TCASII on target aircraft remained 400 ft below our aircraft indicating target was climbing through our altitude converging on collision course. After avoidance maneuver was performed, aircraft was immediately flown back to 8000 ft with a call to approach control stating pop-up traffic and TCASII RA deviation. Approach control verified pop-up traffic and we informed them of the near miss stating reports would follow. After arrival, I personally called west palm beach tower and spoke directly with the supervisor and handling controller. Apparently, student controller training was in progress and the supervising controller stated the student was a little remiss in calling out the pop-up target, but were aware of the aircraft 400 ft below our flight path 2 1/4 mi away on a converging course. Frequency saturation was quite evident, multiple contacts by another VFR aircraft were made to contact pbi approach control to no avail. Aircraft was visually acquired by first officer not flying and appeared to be tan or orange color, twin engine, low wing.

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Original NASA ASRS Text

Title: ACR MLG FLC RPT NMAC WITH TWIN ENG LOW WING ACFT ON CONVERGING COURSE. TCASII EVASIVE ACTION CLB INITIATED BY ACR. CTLR SAYS TFC WAS POP-UP. CTLR TRAINING IN PROGRESS DURING INCIDENT.

Narrative: AT 8000 FT ON THE WEST PALM BEACH SURFN 7 ARR (RADIAL 025 DEGS AT 20 DME), WE ENCOUNTERED POP-UP TCASII TFC AT THE 12 O'CLOCK POS, 400 FT BELOW. WE RECEIVED AN IMMEDIATE TA AND ATTEMPTED TO CONTACT APCH TO VERIFY TFC WITH NO SUCCESS. WE SHORTLY THEREAFTER RECEIVED AN RA WITH TCASII COMMANDS FOR AN IMMEDIATE CLB NO LESS THAN 2000 FPM. PWR WAS APPLIED AND CLB INITIATED TO 8400 FT. WITH SUBSEQUENT AVOIDANCE MANEUVER, TCASII ON TARGET ACFT REMAINED 400 FT BELOW OUR ACFT INDICATING TARGET WAS CLBING THROUGH OUR ALT CONVERGING ON COLLISION COURSE. AFTER AVOIDANCE MANEUVER WAS PERFORMED, ACFT WAS IMMEDIATELY FLOWN BACK TO 8000 FT WITH A CALL TO APCH CTL STATING POP-UP TFC AND TCASII RA DEV. APCH CTL VERIFIED POP-UP TFC AND WE INFORMED THEM OF THE NEAR MISS STATING RPTS WOULD FOLLOW. AFTER ARR, I PERSONALLY CALLED WEST PALM BEACH TWR AND SPOKE DIRECTLY WITH THE SUPVR AND HANDLING CTLR. APPARENTLY, STUDENT CTLR TRAINING WAS IN PROGRESS AND THE SUPERVISING CTLR STATED THE STUDENT WAS A LITTLE REMISS IN CALLING OUT THE POP-UP TARGET, BUT WERE AWARE OF THE ACFT 400 FT BELOW OUR FLT PATH 2 1/4 MI AWAY ON A CONVERGING COURSE. FREQ SATURATION WAS QUITE EVIDENT, MULTIPLE CONTACTS BY ANOTHER VFR ACFT WERE MADE TO CONTACT PBI APCH CTL TO NO AVAIL. ACFT WAS VISUALLY ACQUIRED BY FO NOT FLYING AND APPEARED TO BE TAN OR ORANGE COLOR, TWIN ENG, LOW WING.

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.