Narrative:

I was working departure at dfw in a south flow. A B767-300; departed on a standard RNAV departure climbing to ten thousand feet. His route took him out our east departure gates to fort worth center. Traffic was light at the time I was working him. I climbed the B767-300 to 17;000 ft and somewhere between 10 and 12 thousand feet I shipped him to fort worth center. At that time the B767-300 was just east of dal field. I saw no traffic that he would conflict with. Another departure or two came off dfw and I radar identified them as normal. A few moments later my attention was drawn to a conflict alarm (ca) on the B767-300 and a VFR aircraft squawking 1200 rapidly climbing and turning into him. The B767-300 was approximately climbing out of 14;200 and the VFR was out of approximately 13;800. I reached for the line to call fort worth center and decided not to key up the shout line and tell them of the traffic I saw for two reasons: 1. In my judgment the closure rate of the two aircraft was so fast that by the time I stopped talking the event would be over. 2. I believed if my ca alarm was going off; then fort worth center's must be as well and it would be best if I didn't distract them or pull their attention away from what was happening. The VFR aircraft passed just behind the B767-300 by approximately 100 ft and the B767-300 could be seen descending; more than likely from a TCAS advisory. The VFR aircraft continued to climb to 16;500 and turned on a heading southbound. I began stopping the rest of my traffic at 16;000 or below to pass beneath this aircraft. Fort worth center called to point out the B767-300 descending for a TCAS and I responded that 'yeah I saw it.' fort worth center hung up the line and called a few seconds later to advise me that the B767-300 was going to file a near miss. I responded that I would tell my supervisor. Fort worth center also asked if I was talking to the VFR aircraft. I advised them that I was not talking to him and that maybe someone else at D10 might have been; but I did not know for certain. I advised management at D10 of the entire situation. Several hours later I asked a supervisor what they were able to tell from the replay. It appeared that a VFR aircraft departed tki and climbed on the fringe of the class B airspace. As soon as the VFR aircraft was above the class B airspace; he/she turned toward the B767-300 and climbed to 16;500. I asked if there was anything I needed to do; and I was told no. I had shipped the aircraft and fort worth center had been talking to them for several miles before this situation developed and it was understood why I didn't key the line to tell fort worth center about the ca I had on my scope. Recommendation; in my opinion the VFR aircraft involved must know; or at least be very familiar with the class B airspace around dfw to do what he/she did. This pilot needs to be tracked down and an explanation needs to be given to them on how dangerous the operation he or she conducted was. A climb that high; that rapidly must have been a jet of some sort and to be in an area as busy and congested as dfw should require some communication by the pilot to controllers. Either that or a slower climb rate needed to be used to ensure the safety of air line carriers that cannot maneuver as rapidly as this VFR jet. Everything the VFR jet did was legal; however some common sense needs to be used here. I would strongly recommend that dfw class B airspace should be pushed out further to allow airline carriers the ability to climb to class a airspace and be above any VFR traffic that can and will do something this stupid. They may have had the heavy jet in sight; but no one knows that and the B767-300 obviously had to take action to avoid what they believed to be a dangerous situation.

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Original NASA ASRS Text

Title: D10 Controller described a conflict event between an IFR DFW aircraft and an unknown VFR aircraft climbing rapidly in close proximity of the Class B airspace; the reporter suggested expansion of the Class B.

Narrative: I was working Departure at DFW in a south flow. A B767-300; departed on a standard RNAV departure climbing to ten thousand feet. His route took him out our east departure gates to Fort Worth Center. Traffic was light at the time I was working him. I climbed the B767-300 to 17;000 FT and somewhere between 10 and 12 thousand feet I shipped him to Fort Worth Center. At that time the B767-300 was just east of DAL field. I saw no traffic that he would conflict with. Another departure or two came off DFW and I RADAR identified them as normal. A few moments later my attention was drawn to a Conflict Alarm (CA) on the B767-300 and a VFR aircraft squawking 1200 rapidly climbing and turning into him. The B767-300 was approximately climbing out of 14;200 and the VFR was out of approximately 13;800. I reached for the line to call Fort Worth Center and decided not to key up the shout line and tell them of the traffic I saw for two reasons: 1. In my judgment the closure rate of the two aircraft was so fast that by the time I stopped talking the event would be over. 2. I believed if my CA alarm was going off; then Fort Worth Center's must be as well and it would be best if I didn't distract them or pull their attention away from what was happening. The VFR aircraft passed just behind the B767-300 by approximately 100 FT and the B767-300 could be seen descending; more than likely from a TCAS advisory. The VFR aircraft continued to climb to 16;500 and turned on a heading southbound. I began stopping the rest of my traffic at 16;000 or below to pass beneath this aircraft. Fort Worth Center called to point out the B767-300 descending for a TCAS and I responded that 'yeah I saw it.' Fort Worth Center hung up the line and called a few seconds later to advise me that the B767-300 was going to file a near miss. I responded that I would tell my Supervisor. Fort Worth Center also asked if I was talking to the VFR aircraft. I advised them that I was not talking to him and that maybe someone else at D10 might have been; but I did not know for certain. I advised management at D10 of the entire situation. Several hours later I asked a Supervisor what they were able to tell from the replay. It appeared that a VFR aircraft departed TKI and climbed on the fringe of the Class B airspace. As soon as the VFR aircraft was above the Class B airspace; he/she turned toward the B767-300 and climbed to 16;500. I asked if there was anything I needed to do; and I was told no. I had shipped the aircraft and Fort Worth Center had been talking to them for several miles before this situation developed and it was understood why I didn't key the line to tell Fort Worth Center about the CA I had on my scope. Recommendation; in my opinion the VFR aircraft involved must know; or at least be very familiar with the Class B airspace around DFW to do what he/she did. This pilot needs to be tracked down and an explanation needs to be given to them on how dangerous the operation he or she conducted was. A climb that high; that rapidly must have been a jet of some sort and to be in an area as busy and congested as DFW should require some communication by the pilot to controllers. Either that or a slower climb rate needed to be used to ensure the safety of air line carriers that cannot maneuver as rapidly as this VFR jet. Everything the VFR jet did was legal; however some common sense needs to be used here. I would strongly recommend that DFW Class B airspace should be pushed out further to allow airline carriers the ability to climb to Class A airspace and be above any VFR traffic that can and will do something this stupid. They may have had the Heavy Jet in sight; but no one knows that and the B767-300 obviously had to take action to avoid what they believed to be a dangerous situation.

Data retrieved from NASA's ASRS site as of April 2012 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.