Narrative:

While at cruise at FL220 (J-52 wbound), the TCASII suddenly announced a TA of an fgt that was climbing southeast of the columbus air force base. There was no prior warning of the traffic before the TA (TCASII was in the normal mode showing traffic only within 2700 ft above and below). Within a few seconds of the TA, TCASII went to an RA mode commanding a climb of at least 3000 FPM. I took control of the aircraft, disconnected the autoplt and initiated a rapid climb. Traffic was noted on TCASII to be in our right forward quadrant and at minus 600 ft below our aircraft. An abrupt left turn was then initiated during the climb. At about FL233, the RA ceased, and the aircraft was leveled off. Approach was notified of our deviation from assigned altitude and of the TCASII event. The aircraft was then returned to FL220 on the airway wbound. The intruder aircraft was never sighted visually but came within 600 ft vertically and about 2 mi horizontally. I questioned columbus approach, and was told it was an flight climbing on an IFR flight plan from columbus air force base. At about the same time as the TCASII event occurred, the controller was asking an aircraft with a military sounding call sign to verify his altitude. I don't know if that was the intruder aircraft or not.

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Original NASA ASRS Text

Title: MLG HAS LTSS FROM FGT. TCASII RA.

Narrative: WHILE AT CRUISE AT FL220 (J-52 WBOUND), THE TCASII SUDDENLY ANNOUNCED A TA OF AN FGT THAT WAS CLBING SE OF THE COLUMBUS AIR FORCE BASE. THERE WAS NO PRIOR WARNING OF THE TFC BEFORE THE TA (TCASII WAS IN THE NORMAL MODE SHOWING TFC ONLY WITHIN 2700 FT ABOVE AND BELOW). WITHIN A FEW SECONDS OF THE TA, TCASII WENT TO AN RA MODE COMMANDING A CLB OF AT LEAST 3000 FPM. I TOOK CTL OF THE ACFT, DISCONNECTED THE AUTOPLT AND INITIATED A RAPID CLB. TFC WAS NOTED ON TCASII TO BE IN OUR R FORWARD QUADRANT AND AT MINUS 600 FT BELOW OUR ACFT. AN ABRUPT L TURN WAS THEN INITIATED DURING THE CLB. AT ABOUT FL233, THE RA CEASED, AND THE ACFT WAS LEVELED OFF. APCH WAS NOTIFIED OF OUR DEV FROM ASSIGNED ALT AND OF THE TCASII EVENT. THE ACFT WAS THEN RETURNED TO FL220 ON THE AIRWAY WBOUND. THE INTRUDER ACFT WAS NEVER SIGHTED VISUALLY BUT CAME WITHIN 600 FT VERTICALLY AND ABOUT 2 MI HORIZLY. I QUESTIONED COLUMBUS APCH, AND WAS TOLD IT WAS AN FLT CLBING ON AN IFR FLT PLAN FROM COLUMBUS AIR FORCE BASE. AT ABOUT THE SAME TIME AS THE TCASII EVENT OCCURRED, THE CTLR WAS ASKING AN ACFT WITH A MIL SOUNDING CALL SIGN TO VERIFY HIS ALT. I DON'T KNOW IF THAT WAS THE INTRUDER ACFT OR NOT.

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.