Narrative:

On localizer runway 27 iah before trann intersection at 4000 ft MSL, cleared to 3000 ft. ATC called out VFR traffic 10 O'clock position, left to right. TCASII showed aircraft climbing. We had no visual in haze. We were level at 3000 ft, VFR. Aircraft was still climbing. TA advisory went to RA warning, directed climb which was immediately accomplished. VFR aircraft was seen coming out on right side. We were within 300-200 ft vertical separation. We were on localizer 27 between trann and dento intxns (19.5 - 14.5 DME).

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Original NASA ASRS Text

Title: TCASII RA DURING LOC APCH.

Narrative: ON LOC RWY 27 IAH BEFORE TRANN INTXN AT 4000 FT MSL, CLRED TO 3000 FT. ATC CALLED OUT VFR TFC 10 O'CLOCK POS, L TO R. TCASII SHOWED ACFT CLBING. WE HAD NO VISUAL IN HAZE. WE WERE LEVEL AT 3000 FT, VFR. ACFT WAS STILL CLBING. TA ADVISORY WENT TO RA WARNING, DIRECTED CLB WHICH WAS IMMEDIATELY ACCOMPLISHED. VFR ACFT WAS SEEN COMING OUT ON R SIDE. WE WERE WITHIN 300-200 FT VERT SEPARATION. WE WERE ON LOC 27 BTWN TRANN AND DENTO INTXNS (19.5 - 14.5 DME).

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.