Narrative:

Normal operation until shortly after takeoff runway 16R in maf. Climbing on the runway heading, we took a handoff to departure control and were then given an initial heading of 130 degrees. Approaching our initial clearance altitude of 13000 ft, we asked departure control for higher and were handed off to ZFW on frequency 126.15. We were now level at 13000 ft. Checking in with ZFW, we were told to 'climb and maintain FL180.' we acknowledged and immediately started the climb. Having made contact with center, my first officer now went off to call in the times to maf. While climbing at a high rate passing 14200 ft, I saw a target on the TCASII screen approaching from 1 O'clock position, and descending toward us from above. At almost the same time, the ZFW controller called us: 'maintain 13000 ft.' I started a left 25 degree bank turn and replied that I was approaching 15000 ft. He radioed, 'return to 13000 ft.' I rogered that and added that I was also turning left to avoid the traffic. I pulled off power and pushed the nose over abruptly. Within a few seconds, the TCASII gave me an RA, 'climb.' I immediately pushed the power up and began to climb. The first officer was back on frequency by now and he informed the controller that we had received a climb RA and were complying with it. When the traffic was well clear, we requested some information on the aircraft with whom we had the conflict. The controller simply responded that it was a 'beech jet.' although we heard the controller make several calls to the beech jet, we never heard any of the responses. The controller did not accuse the beech jet of descending through an assigned altitude. I do not know exactly what caused the traffic conflict. Because of the unusual aspect of 'climb, abrupt descent and abrupt climb' that had occurred, I made a PA to the passenger to explain what happened. Nobody had any questions or comments after the flight.

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Original NASA ASRS Text

Title: A CLBING B737-300 FLT CREW DISREGARD A ZFW CTLR DSCNT CLRNC AFTER RECEIVING A TCASII CLB COMMAND DUE TO A CONVERGING, DSNDING BE40.

Narrative: NORMAL OP UNTIL SHORTLY AFTER TKOF RWY 16R IN MAF. CLBING ON THE RWY HDG, WE TOOK A HDOF TO DEP CTL AND WERE THEN GIVEN AN INITIAL HDG OF 130 DEGS. APCHING OUR INITIAL CLRNC ALT OF 13000 FT, WE ASKED DEP CTL FOR HIGHER AND WERE HANDED OFF TO ZFW ON FREQ 126.15. WE WERE NOW LEVEL AT 13000 FT. CHKING IN WITH ZFW, WE WERE TOLD TO 'CLB AND MAINTAIN FL180.' WE ACKNOWLEDGED AND IMMEDIATELY STARTED THE CLB. HAVING MADE CONTACT WITH CTR, MY FO NOW WENT OFF TO CALL IN THE TIMES TO MAF. WHILE CLBING AT A HIGH RATE PASSING 14200 FT, I SAW A TARGET ON THE TCASII SCREEN APCHING FROM 1 O'CLOCK POS, AND DSNDING TOWARD US FROM ABOVE. AT ALMOST THE SAME TIME, THE ZFW CTLR CALLED US: 'MAINTAIN 13000 FT.' I STARTED A L 25 DEG BANK TURN AND REPLIED THAT I WAS APCHING 15000 FT. HE RADIOED, 'RETURN TO 13000 FT.' I ROGERED THAT AND ADDED THAT I WAS ALSO TURNING L TO AVOID THE TFC. I PULLED OFF PWR AND PUSHED THE NOSE OVER ABRUPTLY. WITHIN A FEW SECONDS, THE TCASII GAVE ME AN RA, 'CLB.' I IMMEDIATELY PUSHED THE PWR UP AND BEGAN TO CLB. THE FO WAS BACK ON FREQ BY NOW AND HE INFORMED THE CTLR THAT WE HAD RECEIVED A CLB RA AND WERE COMPLYING WITH IT. WHEN THE TFC WAS WELL CLR, WE REQUESTED SOME INFO ON THE ACFT WITH WHOM WE HAD THE CONFLICT. THE CTLR SIMPLY RESPONDED THAT IT WAS A 'BEECH JET.' ALTHOUGH WE HEARD THE CTLR MAKE SEVERAL CALLS TO THE BEECH JET, WE NEVER HEARD ANY OF THE RESPONSES. THE CTLR DID NOT ACCUSE THE BEECH JET OF DSNDING THROUGH AN ASSIGNED ALT. I DO NOT KNOW EXACTLY WHAT CAUSED THE TFC CONFLICT. BECAUSE OF THE UNUSUAL ASPECT OF 'CLB, ABRUPT DSCNT AND ABRUPT CLB' THAT HAD OCCURRED, I MADE A PA TO THE PAX TO EXPLAIN WHAT HAPPENED. NOBODY HAD ANY QUESTIONS OR COMMENTS AFTER THE FLT.

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.