Call sign confusion resulted in less than legal separation. Departure controller supervisor intervened to keep aircraft separated. Reporter flight crew had other aircraft in sight throughout.

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Attributes
ACN	342211
Time
Date	199607
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : cvg
State Reference	OH
Altitude	msl bound lower : 11000 msl bound upper : 11000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : cvg
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	climbout : intermediate altitude cruise other
Route In Use	enroute airway : cvg
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : commercial pilot : atp
Experience	flight time last 90 days : 90 flight time total : 16000 flight time type : 767
ASRS Report	342211
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation other anomaly other
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance other
Consequence	faa : reviewed incident with flight crew
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

On departure out of cvg, there were 2 flts with call signs of XX46 and XY06. The instructions given to the 2 flts became mixed up. It seemed neither flight knew which instruction were for it, and both flying to nabb. A supervisor came on and told us to maintain heading and stop our climb at a lower altitude. Our TCASII came on with a TA and we had a visual on the other aircraft at all times. It crossed in front of us and eventually cleared out of our range. TCASII never changed from TA to RA, so I didn't think too much about it, until I got a letter about 'loss of separation.' this is in response to that letter.

Original NASA ASRS Text

Title: CALL SIGN CONFUSION RESULTED IN LESS THAN LEGAL SEPARATION. DEP CTLR SUPVR INTERVENED TO KEEP ACFT SEPARATED. RPTR FLC HAD OTHER ACFT IN SIGHT THROUGHOUT.

Narrative: ON DEP OUT OF CVG, THERE WERE 2 FLTS WITH CALL SIGNS OF XX46 AND XY06. THE INSTRUCTIONS GIVEN TO THE 2 FLTS BECAME MIXED UP. IT SEEMED NEITHER FLT KNEW WHICH INSTRUCTION WERE FOR IT, AND BOTH FLYING TO NABB. A SUPVR CAME ON AND TOLD US TO MAINTAIN HEADING AND STOP OUR CLB AT A LOWER ALT. OUR TCASII CAME ON WITH A TA AND WE HAD A VISUAL ON THE OTHER ACFT AT ALL TIMES. IT CROSSED IN FRONT OF US AND EVENTUALLY CLRED OUT OF OUR RANGE. TCASII NEVER CHANGED FROM TA TO RA, SO I DIDN'T THINK TOO MUCH ABOUT IT, UNTIL I GOT A LETTER ABOUT 'LOSS OF SEPARATION.' THIS IS IN RESPONSE TO THAT LETTER.

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.