Narrative:

Air carrier X tracking the runway 28L localizer inbound at 4000 ft to land at pit airport when approach gave us a northerly vector for spacing. This northerly vector brought us to within about 10 mi of a strong thunderstorm. In light rain, we began to receive moderate turbulence which was rapidly getting rougher. I requested a vector out of this area and ATC gave us a left turn to a 210 degree heading and a descent to 3000 ft. As we rolled out on the 210 degree heading and leveled off, we received a TCASII TA. I immediately decreased the TCASII range to 5 mi to better fix the traffic. The TCASII then gave us a descend RA. Shortly after starting the descent the first officer picked up the traffic visually at 12 O'clock. The traffic was a twin jet corporate type Y and was in a right hand climbing turn. As the traffic passed off to our left we received a 'clear of conflict' aural advisory and returned to 3000 ft. I notified ATC of our TCASII RA and the traffic and received no reply. I think that this incident was caused by an overburdened controller making a mistake. A contributing factor was the thunderstorms in the area adding to the controller's workload.

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Original NASA ASRS Text

Title: ACR X TCASII RA HAD LTSS FROM CPR Y. EVASIVE ACTION TAKEN. SYS ERROR.

Narrative: ACR X TRACKING THE RWY 28L LOC INBOUND AT 4000 FT TO LAND AT PIT ARPT WHEN APCH GAVE US A NORTHERLY VECTOR FOR SPACING. THIS NORTHERLY VECTOR BROUGHT US TO WITHIN ABOUT 10 MI OF A STRONG TSTM. IN LIGHT RAIN, WE BEGAN TO RECEIVE MODERATE TURB WHICH WAS RAPIDLY GETTING ROUGHER. I REQUESTED A VECTOR OUT OF THIS AREA AND ATC GAVE US A L TURN TO A 210 DEG HDG AND A DSCNT TO 3000 FT. AS WE ROLLED OUT ON THE 210 DEG HDG AND LEVELED OFF, WE RECEIVED A TCASII TA. I IMMEDIATELY DECREASED THE TCASII RANGE TO 5 MI TO BETTER FIX THE TFC. THE TCASII THEN GAVE US A DSND RA. SHORTLY AFTER STARTING THE DSCNT THE FO PICKED UP THE TFC VISUALLY AT 12 O'CLOCK. THE TFC WAS A TWIN JET CORPORATE TYPE Y AND WAS IN A R HAND CLBING TURN. AS THE TFC PASSED OFF TO OUR L WE RECEIVED A 'CLR OF CONFLICT' AURAL ADVISORY AND RETURNED TO 3000 FT. I NOTIFIED ATC OF OUR TCASII RA AND THE TFC AND RECEIVED NO REPLY. I THINK THAT THIS INCIDENT WAS CAUSED BY AN OVERBURDENED CTLR MAKING A MISTAKE. A CONTRIBUTING FACTOR WAS THE TSTMS IN THE AREA ADDING TO THE CTLR'S WORKLOAD.

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.