Narrative:

Part 2 of 2. After recycling the switch a TA target was created, co-altitude at 12 O'clock position at 2-3 NM which disappeared immediately and was immediately followed by an aural descend, descend. The autoplt was disengaged, we started an immediate descent and then looked for the target rate of descent and RA. The RA never occurred nor did the rate of descent on the ivsi. By that time we were at 250- 300 ft below altitude where we began a gradual ascent, because the warnings had disappeared. We also informed ATC that we were following an RA and were returning to our altitude because our warnings had ceased. He said that he hated when that happens. It sounded like similar occurrences had happened when people had recycled their xponders. I am wondering if this has happened much before or if it has and I didn't pay close enough attention to other people's company flight crew reports or our air carrier publication notes.

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Original NASA ASRS Text

Title: SUPER MD80 ENRTE ORD-DFW NEAR STL RECYCLED XPONDER AND GOT A TA TARGET ON TCASII AT SAME ALT. TA DISAPPEARED IMMEDIATELY, FOLLOWED BY AURAL WARNING TO DSND. COMPLIED WITH WARNING AND CEASED AFTER 200-300 FT DEV. ADVISED CTLR WHO IMPLIED IT HAS HAPPENED BEFORE.

Narrative: PART 2 OF 2. AFTER RECYCLING THE SWITCH A TA TARGET WAS CREATED, CO-ALT AT 12 O'CLOCK POS AT 2-3 NM WHICH DISAPPEARED IMMEDIATELY AND WAS IMMEDIATELY FOLLOWED BY AN AURAL DSND, DSND. THE AUTOPLT WAS DISENGAGED, WE STARTED AN IMMEDIATE DSCNT AND THEN LOOKED FOR THE TARGET RATE OF DSCNT AND RA. THE RA NEVER OCCURRED NOR DID THE RATE OF DSCNT ON THE IVSI. BY THAT TIME WE WERE AT 250- 300 FT BELOW ALT WHERE WE BEGAN A GRADUAL ASCENT, BECAUSE THE WARNINGS HAD DISAPPEARED. WE ALSO INFORMED ATC THAT WE WERE FOLLOWING AN RA AND WERE RETURNING TO OUR ALT BECAUSE OUR WARNINGS HAD CEASED. HE SAID THAT HE HATED WHEN THAT HAPPENS. IT SOUNDED LIKE SIMILAR OCCURRENCES HAD HAPPENED WHEN PEOPLE HAD RECYCLED THEIR XPONDERS. I AM WONDERING IF THIS HAS HAPPENED MUCH BEFORE OR IF IT HAS AND I DIDN'T PAY CLOSE ENOUGH ATTN TO OTHER PEOPLE'S COMPANY FLC RPTS OR OUR ACR PUB NOTES.

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.