A319 on final at iad received TA from ATC followed by TCASII RA resulting in an elected go around.

Attributes
ACN	675754
Time
Date	200510
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : iad.airport
State Reference	VA
Altitude	agl single value : 1500
Environment
Flight Conditions	VMC
Aircraft 1
Controlling Facilities	tracon : pct.tracon
Operator	common carrier : air carrier
Make Model Name	A319
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : pct.tracon
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Experience	flight time last 90 days : 150 flight time total : 20000 flight time type : 400
ASRS Report	675754
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	conflict : airborne less severe
Independent Detector	aircraft equipment : tcas other flight crewa
Resolutory Action	flight crew : executed go around flight crew : took evasive action
Supplementary
Problem Areas	Aircraft FAA ATC Human Performance
Primary Problem	Ambiguous

Narrative:

On final approach runway 1R; iad; outside the FAF; tower advised us several times of traffic below us. We received a TA followed by RA climb. After following the RA; we received an all clear. We were by the FAF by this time and attempted to resume the approach. However; soon after; as we were not fully configured and unstabilized; we elected to execute a missed approach. We then returned to iad and landed.

Original NASA ASRS Text

Title: A319 ON FINAL AT IAD RECEIVED TA FROM ATC FOLLOWED BY TCASII RA RESULTING IN AN ELECTED GAR.

Narrative: ON FINAL APCH RWY 1R; IAD; OUTSIDE THE FAF; TWR ADVISED US SEVERAL TIMES OF TFC BELOW US. WE RECEIVED A TA FOLLOWED BY RA CLB. AFTER FOLLOWING THE RA; WE RECEIVED AN ALL CLR. WE WERE BY THE FAF BY THIS TIME AND ATTEMPTED TO RESUME THE APCH. HOWEVER; SOON AFTER; AS WE WERE NOT FULLY CONFIGURED AND UNSTABILIZED; WE ELECTED TO EXECUTE A MISSED APCH. WE THEN RETURNED TO IAD AND LANDED.

Data retrieved from NASA's ASRS site as of January 2009 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.