Narrative:

Simultaneous approachs were in use in denver with WX approximately 500 ft overcast and 1/2 mi visibility. We were vectored for the ILS runway 35L approach and intercepted the localizer prior to chola intersection. Just prior to chola intersection; we were cleared for the approach and instructed to contact tower. Began descent on GS and contacted tower as instructed. A few seconds later; received TCAS RA 'monitor or reduce vertical speed' as a target was seen on TCAS slightly to the right and approximately 400 ft below us. Due to IMC; unable to visually acquire other aircraft as first officer complied with RA. Seconds later second RA 'climb; climb' was received and followed; however; could not inform ATC due to chatter on frequency. Several seconds later; chatter cleared and told ATC of RA and climb. His response was something like 'roger; that's just parallel traffic on the approach; separation is good.' I told ATC that we had to follow RA since unable to see other aircraft. Don't recall exact response from ATC; but his tone indicated he was clearly annoyed with us for following RA. Received 'clear of conflict' and rapid descent was made in an attempt to salvage approach. Told ATC of this and possibility of missed approach which seemed to add to his 'frustration.' ATC reminded us several times we were high on GS (we knew that). Very high task saturation but later returned to GS for a barely stable approach and normal landing. A follow-up call to tower after landing resulted in conversation with supervisor; not controller in question. I explained to him that my complaint was not with the RA but the controller's response to it. I told him that without a visual contact with other aircraft; RA had to be followed. Even though controller never issued instructions contrary to RA; he sounded upset that we were following it. Since I cannot recall our radio exchanges verbatim; a review of the ATC tapes/data might be in order.

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Original NASA ASRS Text

Title: B737-500 FLT CREW WHILE ON ILS APCH RECEIVES A TCAS RA; EXECUTES ESCAPE MANEUVER AND RECEIVES CLR OF CONFLICT. LANDS.

Narrative: SIMULTANEOUS APCHS WERE IN USE IN DENVER WITH WX APPROX 500 FT OVCST AND 1/2 MI VISIBILITY. WE WERE VECTORED FOR THE ILS RWY 35L APCH AND INTERCEPTED THE LOC PRIOR TO CHOLA INTXN. JUST PRIOR TO CHOLA INTXN; WE WERE CLRED FOR THE APCH AND INSTRUCTED TO CONTACT TWR. BEGAN DSCNT ON GS AND CONTACTED TWR AS INSTRUCTED. A FEW SECONDS LATER; RECEIVED TCAS RA 'MONITOR OR REDUCE VERT SPD' AS A TARGET WAS SEEN ON TCAS SLIGHTLY TO THE R AND APPROX 400 FT BELOW US. DUE TO IMC; UNABLE TO VISUALLY ACQUIRE OTHER ACFT AS FO COMPLIED WITH RA. SECONDS LATER SECOND RA 'CLB; CLB' WAS RECEIVED AND FOLLOWED; HOWEVER; COULD NOT INFORM ATC DUE TO CHATTER ON FREQ. SEVERAL SECONDS LATER; CHATTER CLRED AND TOLD ATC OF RA AND CLB. HIS RESPONSE WAS SOMETHING LIKE 'ROGER; THAT'S JUST PARALLEL TFC ON THE APCH; SEPARATION IS GOOD.' I TOLD ATC THAT WE HAD TO FOLLOW RA SINCE UNABLE TO SEE OTHER ACFT. DON'T RECALL EXACT RESPONSE FROM ATC; BUT HIS TONE INDICATED HE WAS CLRLY ANNOYED WITH US FOR FOLLOWING RA. RECEIVED 'CLR OF CONFLICT' AND RAPID DSCNT WAS MADE IN AN ATTEMPT TO SALVAGE APCH. TOLD ATC OF THIS AND POSSIBILITY OF MISSED APCH WHICH SEEMED TO ADD TO HIS 'FRUSTRATION.' ATC REMINDED US SEVERAL TIMES WE WERE HIGH ON GS (WE KNEW THAT). VERY HIGH TASK SATURATION BUT LATER RETURNED TO GS FOR A BARELY STABLE APCH AND NORMAL LNDG. A FOLLOW-UP CALL TO TWR AFTER LNDG RESULTED IN CONVERSATION WITH SUPVR; NOT CTLR IN QUESTION. I EXPLAINED TO HIM THAT MY COMPLAINT WAS NOT WITH THE RA BUT THE CTLR'S RESPONSE TO IT. I TOLD HIM THAT WITHOUT A VISUAL CONTACT WITH OTHER ACFT; RA HAD TO BE FOLLOWED. EVEN THOUGH CTLR NEVER ISSUED INSTRUCTIONS CONTRARY TO RA; HE SOUNDED UPSET THAT WE WERE FOLLOWING IT. SINCE I CANNOT RECALL OUR RADIO EXCHANGES VERBATIM; A REVIEW OF THE ATC TAPES/DATA MIGHT BE IN ORDER.

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.