Narrative:

ATC failed to provide adequate separation from the second target. This event took place over jagal at 4000 ft MSL and on the localizer course to runway 26. We were cleared to intercept the runway 26 localizer and cross at or above 4000 ft MSL at jagal. We were subsequently cleared for the visual approach runway 26. ATC advised us of traffic at 12-1 O'clock position; approximately 1200 ft below us. I observed this traffic and pointed it out to the captain. When over jagal at 4000 ft MSL a second target approximately 200 ft below us caused an RA climb command. The captain spotted the second target at about the same time we received the RA command. We responded to the RA and immediately climbed to clear the conflict. Once clear; we configured the aircraft and re-established a stable approach to an uneventful landing. We responded to an RA from the aircraft warning system. As the PF; I was in the manual mode of operation at the time of the event. When I noticed the RA visual and aural command; I immediately pushed the power forward and pulled back on the yoke to climb the aircraft. Once clear of the conflict; I returned the aircraft to level flight. I believe this event happened because of an ATC operational error. The aircraft that caused the RA was in the wrong place; and this was not picked up by ATC. It would be hard to provide suggestions for avoiding recurrence of this event.

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Original NASA ASRS Text

Title: ACR PLT EXPERIENCED TCAS RA WHILE ON FINAL FOR RWY 26 AT PHX AT 4000 FT.

Narrative: ATC FAILED TO PROVIDE ADEQUATE SEPARATION FROM THE SECOND TARGET. THIS EVENT TOOK PLACE OVER JAGAL AT 4000 FT MSL AND ON THE LOC COURSE TO RWY 26. WE WERE CLRED TO INTERCEPT THE RWY 26 LOC AND CROSS AT OR ABOVE 4000 FT MSL AT JAGAL. WE WERE SUBSEQUENTLY CLRED FOR THE VISUAL APCH RWY 26. ATC ADVISED US OF TFC AT 12-1 O'CLOCK POS; APPROX 1200 FT BELOW US. I OBSERVED THIS TFC AND POINTED IT OUT TO THE CAPT. WHEN OVER JAGAL AT 4000 FT MSL A SECOND TARGET APPROX 200 FT BELOW US CAUSED AN RA CLB COMMAND. THE CAPT SPOTTED THE SECOND TARGET AT ABOUT THE SAME TIME WE RECEIVED THE RA COMMAND. WE RESPONDED TO THE RA AND IMMEDIATELY CLBED TO CLR THE CONFLICT. ONCE CLR; WE CONFIGURED THE ACFT AND RE-ESTABLISHED A STABLE APCH TO AN UNEVENTFUL LNDG. WE RESPONDED TO AN RA FROM THE ACFT WARNING SYS. AS THE PF; I WAS IN THE MANUAL MODE OF OP AT THE TIME OF THE EVENT. WHEN I NOTICED THE RA VISUAL AND AURAL COMMAND; I IMMEDIATELY PUSHED THE PWR FORWARD AND PULLED BACK ON THE YOKE TO CLB THE ACFT. ONCE CLR OF THE CONFLICT; I RETURNED THE ACFT TO LEVEL FLT. I BELIEVE THIS EVENT HAPPENED BECAUSE OF AN ATC OPERROR. THE ACFT THAT CAUSED THE RA WAS IN THE WRONG PLACE; AND THIS WAS NOT PICKED UP BY ATC. IT WOULD BE HARD TO PROVIDE SUGGESTIONS FOR AVOIDING RECURRENCE OF THIS EVENT.

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.