Narrative:

Air carrier X was given clearance to cross 40 NM west of vuz VOR at 11000 ft, reclred shortly thereafter to cross 40 NM at 13000 ft. While descending through 17000 ft at 3500 FPM columbus approach issued clearance to maintain 17000 ft. Air carrier X descended through 16400 ft before climb could be initiated. At same time had TCASII TA advisory at 10 mi, 100 ft above our altitude. TA changed to flight attendant at 5 mi and issued climb command at 1200-1500 FPM. Cpr Y aircraft sighted at 1 O'clock position and about 1/2 mi. Immediate left turn initiated. TCASII indicated advisory aircraft at 100 ft below ours. No TA was issued by columbus approach. Other aircraft was light transport descending on IFR flight plan. Was later advised controller training was in progress at columbus approach.

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Original NASA ASRS Text

Title: ACR X HAD LTSS FROM CPR Y. SYS ERROR. ACR X TCASII TA RA EVASIVE ACTION TAKEN.

Narrative: ACR X WAS GIVEN CLRNC TO CROSS 40 NM W OF VUZ VOR AT 11000 FT, RECLRED SHORTLY THEREAFTER TO CROSS 40 NM AT 13000 FT. WHILE DSNDING THROUGH 17000 FT AT 3500 FPM COLUMBUS APCH ISSUED CLRNC TO MAINTAIN 17000 FT. ACR X DSNDED THROUGH 16400 FT BEFORE CLB COULD BE INITIATED. AT SAME TIME HAD TCASII TA ADVISORY AT 10 MI, 100 FT ABOVE OUR ALT. TA CHANGED TO FA AT 5 MI AND ISSUED CLB COMMAND AT 1200-1500 FPM. CPR Y ACFT SIGHTED AT 1 O'CLOCK POS AND ABOUT 1/2 MI. IMMEDIATE L TURN INITIATED. TCASII INDICATED ADVISORY ACFT AT 100 FT BELOW OURS. NO TA WAS ISSUED BY COLUMBUS APCH. OTHER ACFT WAS LTT DSNDING ON IFR FLT PLAN. WAS LATER ADVISED CTLR TRAINING WAS IN PROGRESS AT COLUMBUS APCH.

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.