Air carrier captain reported an near midair collision with GA aircraft on approach to dfw airport.

Attributes
ACN	1632775
Time
Date	201904
Local Time Of Day	0601-1200
Place
Locale Reference	DFW.Airport
State Reference	TX
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	Initial Approach
Flight Plan	IFR
Aircraft 2
Make Model Name	Small Aircraft
Operating Under FAR Part	Part 91
Flight Phase	Cruise
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Multiengine Flight Crew Instrument
Events
Anomaly	ATC Issue All Types Conflict NMAC Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy

Narrative:

Flight was level at 3;000 MSL on vectors to a visual approach to 17L at dfw. While approaching the draak waypoint heading westbound ATC called small aircraft traffic level at 2;500 MSL; 12 O'clock; opposite direction. The crew was unable to visually acquire the small aircraft and as it passed under the aircraft a TCAS RA was received. The PF (pilot flying) executed the avoidance maneuver by climbing to 3;500 MSL. ATC was notified; the flight completed the visual approach and landed without further incident.traffic passed under aircraft with 500 feet of vertical separation.

Original NASA ASRS Text

Title: Air carrier Captain reported an NMAC with GA aircraft on approach to DFW airport.

Narrative: Flight was level at 3;000 MSL on vectors to a visual approach to 17L at DFW. While approaching the DRAAK waypoint heading westbound ATC called small aircraft traffic level at 2;500 MSL; 12 O'clock; opposite direction. The crew was unable to visually acquire the small aircraft and as it passed under the aircraft a TCAS RA was received. The PF (Pilot Flying) executed the avoidance maneuver by climbing to 3;500 MSL. ATC was notified; the flight completed the visual approach and landed without further incident.Traffic passed under aircraft with 500 feet of vertical separation.

Data retrieved from NASA's ASRS site 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.