Narrative:

On approach to runway 1C at iad at 2;200 MSL on an approximate 6-7 NM visual final at 180 KIAS with flaps 2 and gear up; we noticed an aircraft coming at us from the left slightly below our altitude. As we were contemplating either taking evasive action or querying tower; we received a TCAS RA to climb; which we complied with. The other aircraft turned towards the correct runway 1L; and the RA went away. We were able to continue the approach and land with no other issues. The approximate range was 300-500 ft vertically and 800-1;000 laterally.

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Original NASA ASRS Text

Title: A320 flight crew on the ILS to Runway 1C at IAD describe a TCAS event with a B777 intercepting the Runway 1L centerline for the visual. A B757 crew following the B777 described the event from their perspective.

Narrative: On approach to Runway 1C at IAD at 2;200 MSL on an approximate 6-7 NM visual final at 180 KIAS with flaps 2 and gear up; we noticed an aircraft coming at us from the left slightly below our altitude. As we were contemplating either taking evasive action or querying Tower; we received a TCAS RA to climb; which we complied with. The other aircraft turned towards the correct Runway 1L; and the RA went away. We were able to continue the approach and land with no other issues. The approximate range was 300-500 FT vertically and 800-1;000 laterally.

Data retrieved from NASA's ASRS site as of April 2012 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.