B737 landing dfw experienced TCASII RA with ATC issued VFR traffic.

Attributes
ACN	581152
Time
Date	200305
Day	Tue
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : dfw.airport
State Reference	TX
Altitude	msl single value : 3000
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Controlling Facilities	tracon : d10.tracon tower : phl.tower
Operator	common carrier : air carrier
Make Model Name	B737-300
Operating Under FAR Part	Part 121
Navigation In Use	ils localizer only : 18r other
Flight Phase	descent : approach
Route In Use	approach : instrument non precision arrival : on vectors
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : d10.tracon
Make Model Name	Skyhawk 172/Cutlass 172
Flight Phase	cruise : level cruise : enroute altitude change
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 100 flight time total : 26000 flight time type : 16000
ASRS Report	581152
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne less severe
Independent Detector	aircraft equipment : tcas other flight crewa
Resolutory Action	controller : issued alert flight crew : took evasive action flight crew : returned to assigned airspace
Consequence	other
Miss Distance	vertical : 500
Supplementary
Problem Areas	ATC Human Performance Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

While on localizer/DME runway 18R approach at dfw, ATC issued VFR traffic. We saw him ahead and to our left about 800 ft below us on the TCASII, but did not see him visually. Shortly thereafter, the other aircraft started climbing and we got a TCASII RA. We complied with the RA command and climbed to about 3500 ft MSL. We then saw the other aircraft pass about 500 ft beneath us. We descended back down to 3000 ft MSL and continued the approach.

Original NASA ASRS Text

Title: B737 LNDG DFW EXPERIENCED TCASII RA WITH ATC ISSUED VFR TFC.

Narrative: WHILE ON LOC/DME RWY 18R APCH AT DFW, ATC ISSUED VFR TFC. WE SAW HIM AHEAD AND TO OUR L ABOUT 800 FT BELOW US ON THE TCASII, BUT DID NOT SEE HIM VISUALLY. SHORTLY THEREAFTER, THE OTHER ACFT STARTED CLBING AND WE GOT A TCASII RA. WE COMPLIED WITH THE RA COMMAND AND CLBED TO ABOUT 3500 FT MSL. WE THEN SAW THE OTHER ACFT PASS ABOUT 500 FT BENEATH US. WE DSNDED BACK DOWN TO 3000 FT MSL AND CONTINUED THE APCH.

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.