Narrative:

We were vectored for ILS runway 27R at phl. ATC had been assigning headings and speeds. We were cleared for the ILS runway 27R from 3000 ft. We intercepted the localizer and shortly thereafter the GS. Approaching the speez LOM were handed off to phl tower. As we tuned the tower frequency we received a TCASII TA. This was a very busy time as we were spaced behind another aircraft on the approach, configuring for landing, performing the landing checklist, and complying with ATC speed restrs. As we were descending on the GS and over speez, TCASII announced the RA 'reduce descent.' by now we had visually acquired both intruder aircraft displayed by TCASII. In response to the RA the autoplt was disconnected and we deviated slightly above the GS. TCASII soon announced 'clear of conflict' and we easily returned to the GS and landed without further incident. Because of our workload and the minor nature of the deviation the RA was not reported to ATC. I did report this incident to my dispatcher and the company and was told that they would advise ATC of the event. Had it not been for TCASII this encounter would have been very close. ATC did not advise us of this traffic. If there is a VFR corridor through the class B airspace at this location, I would suggest moving it before someone gets hurt. At the very least all traffic should receive an advisory from ATC.

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Original NASA ASRS Text

Title: FOKKER 100 ON APCH VECTORS HAS TCASII RA.

Narrative: WE WERE VECTORED FOR ILS RWY 27R AT PHL. ATC HAD BEEN ASSIGNING HDGS AND SPDS. WE WERE CLRED FOR THE ILS RWY 27R FROM 3000 FT. WE INTERCEPTED THE LOC AND SHORTLY THEREAFTER THE GS. APCHING THE SPEEZ LOM WERE HANDED OFF TO PHL TWR. AS WE TUNED THE TWR FREQ WE RECEIVED A TCASII TA. THIS WAS A VERY BUSY TIME AS WE WERE SPACED BEHIND ANOTHER ACFT ON THE APCH, CONFIGURING FOR LNDG, PERFORMING THE LNDG CHKLIST, AND COMPLYING WITH ATC SPD RESTRS. AS WE WERE DSNDING ON THE GS AND OVER SPEEZ, TCASII ANNOUNCED THE RA 'REDUCE DSCNT.' BY NOW WE HAD VISUALLY ACQUIRED BOTH INTRUDER ACFT DISPLAYED BY TCASII. IN RESPONSE TO THE RA THE AUTOPLT WAS DISCONNECTED AND WE DEVIATED SLIGHTLY ABOVE THE GS. TCASII SOON ANNOUNCED 'CLR OF CONFLICT' AND WE EASILY RETURNED TO THE GS AND LANDED WITHOUT FURTHER INCIDENT. BECAUSE OF OUR WORKLOAD AND THE MINOR NATURE OF THE DEV THE RA WAS NOT RPTED TO ATC. I DID RPT THIS INCIDENT TO MY DISPATCHER AND THE COMPANY AND WAS TOLD THAT THEY WOULD ADVISE ATC OF THE EVENT. HAD IT NOT BEEN FOR TCASII THIS ENCOUNTER WOULD HAVE BEEN VERY CLOSE. ATC DID NOT ADVISE US OF THIS TFC. IF THERE IS A VFR CORRIDOR THROUGH THE CLASS B AIRSPACE AT THIS LOCATION, I WOULD SUGGEST MOVING IT BEFORE SOMEONE GETS HURT. AT THE VERY LEAST ALL TFC SHOULD RECEIVE AN ADVISORY FROM ATC.

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.