Narrative:

In descent clearance to FL220, from FL240, we were told that clt VOR was OTS. ZTL gave heading of 190 degrees from 130 degrees. We were about to penetrate cloud layer below. In a very fast 10-15 seconds the following happened. I, the PNF, went off frequency to check clt ATIS and, almost simultaneously, TCASII gave TA red arc to approximately 900 ft. The first officer disconnected autoplt at approximately FL234. Rate of descent increased to 4000 FPM to stay out of red arc. Then all red and resolution to climb at approximately 500 FPM. By the time climb started, we were at FL211 or FL212. Altitude alerter aural warning overridden twice by the loudness of RA. Queried ATC of potential traffic conflict. Due to speeds and noise and after questioning ATC about TCASII TA/RA, the traffic they called conflicted with our scope. By the time we rectified the whole sequence, following FAA approved company TCASII procedures, we shot through our assigned altitude (manually flying) because the air noise and TCASII TA/RA noise overrode the altitude warning horn (1000 ft before level off and 400 ft below assigned altitude).

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Original NASA ASRS Text

Title: AN ACR MLG OVERSHOT ITS ALT ON DSCNT. THERE WAS A TCASII ALERT GOING ON AT THE SAME TIME.

Narrative: IN DSCNT CLRNC TO FL220, FROM FL240, WE WERE TOLD THAT CLT VOR WAS OTS. ZTL GAVE HDG OF 190 DEGS FROM 130 DEGS. WE WERE ABOUT TO PENETRATE CLOUD LAYER BELOW. IN A VERY FAST 10-15 SECONDS THE FOLLOWING HAPPENED. I, THE PNF, WENT OFF FREQ TO CHK CLT ATIS AND, ALMOST SIMULTANEOUSLY, TCASII GAVE TA RED ARC TO APPROX 900 FT. THE FO DISCONNECTED AUTOPLT AT APPROX FL234. RATE OF DSCNT INCREASED TO 4000 FPM TO STAY OUT OF RED ARC. THEN ALL RED AND RESOLUTION TO CLB AT APPROX 500 FPM. BY THE TIME CLB STARTED, WE WERE AT FL211 OR FL212. ALT ALERTER AURAL WARNING OVERRIDDEN TWICE BY THE LOUDNESS OF RA. QUERIED ATC OF POTENTIAL TFC CONFLICT. DUE TO SPDS AND NOISE AND AFTER QUESTIONING ATC ABOUT TCASII TA/RA, THE TFC THEY CALLED CONFLICTED WITH OUR SCOPE. BY THE TIME WE RECTIFIED THE WHOLE SEQUENCE, FOLLOWING FAA APPROVED COMPANY TCASII PROCS, WE SHOT THROUGH OUR ASSIGNED ALT (MANUALLY FLYING) BECAUSE THE AIR NOISE AND TCASII TA/RA NOISE OVERRODE THE ALT WARNING HORN (1000 FT BEFORE LEVEL OFF AND 400 FT BELOW ASSIGNED ALT).

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.