E120 climbing out from dfw sights traffic on TCASII behind and below and questions controller. Controller states the traffic was being worked by another controller next to him. The E120 crew then spotted a blue and white CL601 very close, received a TCASII RA, and took evasive action.

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Attributes
ACN	402122
Time
Date	199805
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : dtw
State Reference	TX
Altitude	msl bound lower : 11000 msl bound upper : 11200
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : dfw
Operator	common carrier : air carrier
Make Model Name	Xingu EMB-121 All Series
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude
Route In Use	departure other
Flight Plan	IFR
Aircraft 2
Operator	general aviation : corporate
Make Model Name	Challenger CL601
Operating Under FAR Part	Part 91
Flight Phase	climbout : intermediate altitude
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Experience	flight time last 90 days : 150 flight time total : 2500 flight time type : 1700
ASRS Report	402122
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 8100 flight time type : 6000
ASRS Report	402117
Events
Anomaly	conflict : airborne less severe
Independent Detector	aircraft equipment other aircraft equipment : unspecified other controllera other flight crewa
Resolutory Action	controller : issued new clearance
Consequence	Other
Miss Distance	horizontal : 2000 vertical : 0
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	other

Narrative:

Climbing through 11000 ft, we noticed the target on TCASII. It was initially 500 ft below and about 2 mi at our 3-4 O'clock position. The TCASII system gave an alert. I queried the controller about the traffic as I made visual contact and pointed the challenger out to the captain. ATC advised us to expedite to 12000 ft. While we began a turn to the left, ATC advised the same action. A major contributing factor was the use of 2 ATC frequencys for the same airspace. Supplemental information from acn 402117: the first officer saw the blue and white challenger and asked ATC if he was working the traffic. At this time the PF was turning left to avoid the conflict. ATC then told us to turn left immediately. PF asked if he was talking to the traffic, he stated, 'no, but the guy next to me is.'

Original NASA ASRS Text

Title: E120 CLBING OUT FROM DFW SIGHTS TFC ON TCASII BEHIND AND BELOW AND QUESTIONS CTLR. CTLR STATES THE TFC WAS BEING WORKED BY ANOTHER CTLR NEXT TO HIM. THE E120 CREW THEN SPOTTED A BLUE AND WHITE CL601 VERY CLOSE, RECEIVED A TCASII RA, AND TOOK EVASIVE ACTION.

Narrative: CLBING THROUGH 11000 FT, WE NOTICED THE TARGET ON TCASII. IT WAS INITIALLY 500 FT BELOW AND ABOUT 2 MI AT OUR 3-4 O'CLOCK POS. THE TCASII SYS GAVE AN ALERT. I QUERIED THE CTLR ABOUT THE TFC AS I MADE VISUAL CONTACT AND POINTED THE CHALLENGER OUT TO THE CAPT. ATC ADVISED US TO EXPEDITE TO 12000 FT. WHILE WE BEGAN A TURN TO THE L, ATC ADVISED THE SAME ACTION. A MAJOR CONTRIBUTING FACTOR WAS THE USE OF 2 ATC FREQS FOR THE SAME AIRSPACE. SUPPLEMENTAL INFO FROM ACN 402117: THE FO SAW THE BLUE AND WHITE CHALLENGER AND ASKED ATC IF HE WAS WORKING THE TFC. AT THIS TIME THE PF WAS TURNING L TO AVOID THE CONFLICT. ATC THEN TOLD US TO TURN L IMMEDIATELY. PF ASKED IF HE WAS TALKING TO THE TFC, HE STATED, 'NO, BUT THE GUY NEXT TO ME IS.'

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.