Narrative:

Aircraft X inbound to dfw was cleared from 5000 to 3000', heading 100 degrees, to intercept the localizer for runway 13R at dfw. At 3300' the controller called traffic at 12 O'clock, 1 mi, no altitude readout. First officer called pull up and the single engine aircraft Y passed underneath our aircraft. I estimated him at 3000'. We proceeded and landed west/O incident. Small aircraft Y was on a heading of 280 degrees, 3000' directly into the path of arrival traffic to runway 13R at dfw. The center called the traffic at 1 NM, but had no actual readout. Problem caused by light aircraft climbing into the base of the TCA in a high density traffic area. Believe we need a continuing education process on procedures around the TCA's. No violent maneuvers involved. Passenger were unaware of problem.

Related reports:

Google
 

Original NASA ASRS Text

Title: NMAC BETWEEN COMMUTER AND SMA. SEE AND AVOID SITUATION.

Narrative: ACFT X INBND TO DFW WAS CLRED FROM 5000 TO 3000', HDG 100 DEGS, TO INTERCEPT THE LOC FOR RWY 13R AT DFW. AT 3300' THE CTLR CALLED TFC AT 12 O'CLOCK, 1 MI, NO ALT READOUT. F/O CALLED PULL UP AND THE SINGLE ENG ACFT Y PASSED UNDERNEATH OUR ACFT. I ESTIMATED HIM AT 3000'. WE PROCEEDED AND LANDED W/O INCIDENT. SMA Y WAS ON A HDG OF 280 DEGS, 3000' DIRECTLY INTO THE PATH OF ARR TFC TO RWY 13R AT DFW. THE CENTER CALLED THE TFC AT 1 NM, BUT HAD NO ACTUAL READOUT. PROB CAUSED BY LIGHT ACFT CLBING INTO THE BASE OF THE TCA IN A HIGH DENSITY TFC AREA. BELIEVE WE NEED A CONTINUING EDUCATION PROCESS ON PROCS AROUND THE TCA'S. NO VIOLENT MANEUVERS INVOLVED. PAX WERE UNAWARE OF PROB.

Data retrieved from NASA's ASRS site as of August 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.