B737 captain reported complying with a RA to avoid a collision during a turn to base.

Attributes
ACN	1483678
Time
Date	201709
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Final Approach
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Person 1
Function	Captain Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Type 162
Events
Anomaly	ATC Issue All Types Conflict NMAC Deviation - Procedural Published Material / Policy
Miss Distance	Horizontal 0 Vertical 500

Narrative:

[We complied] to a RA to avoid a substantial risk of collision. The controller turned us on a short base leg to 4R; we were cleared to slow to 170; then descend from 3000 to 2000. Traffic was pointed out to us at 1 to 2 o'clock while we were in the turn; we advised we did not have the traffic. We were in a turn to the right and that area of our vision was blocked. As we rolled out; we immediately had a TA; and before we saw the traffic; we had the RA. We maneuvered in accordance to the RA to avoid the traffic. Once the traffic was below us and now south of us; the controller said the traffic was clear and to continue the approach. We reported to RA maneuver and continued. We only saw the traffic after it was passing under our aircraft. The controller basically turned us directly into this traffic. I wrote 'no information' regarding if we were within 500 feet; because I was not certain; but I do believe it was close to 500.

Original NASA ASRS Text

Title: B737 Captain reported complying with a RA to avoid a collision during a turn to base.

Narrative: [We complied] to a RA to avoid a substantial risk of collision. The controller turned us on a short base leg to 4R; we were cleared to slow to 170; then descend from 3000 to 2000. Traffic was pointed out to us at 1 to 2 o'clock while we were in the turn; we advised we did not have the traffic. We were in a turn to the right and that area of our vision was blocked. As we rolled out; we immediately had a TA; and before we saw the traffic; we had the RA. We maneuvered in accordance to the RA to avoid the traffic. Once the traffic was below us and now south of us; the controller said the traffic was clear and to continue the approach. We reported to RA maneuver and continued. We only saw the traffic after it was passing under our aircraft. The controller basically turned us directly into this traffic. I wrote 'no information' regarding if we were within 500 feet; because I was not certain; but I do believe it was close to 500.

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.