Operational error less when reporter issued climb instruction using the wrong call sign. Aircraft conflicted with opposite direction company aircraft which took evasive action upon sighting the climbing aircraft.

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Attributes
ACN	373680
Time
Date	199706
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : ave
State Reference	CA
Altitude	msl bound lower : 29000 msl bound upper : 31000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	cruise other cruise other
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller military : 8 controller non radar : 6 controller radar : 15
ASRS Report	373680
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : required legal separation other anomaly other
Independent Detector	other controllera other flight crewa
Resolutory Action	controller : issued new clearance flight crew : took evasive action other
Consequence	Other
Miss Distance	horizontal : 12000 vertical : 1300
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

While vectoring air carrier Z for traffic, accidentally used air carrier X's call sign 25 mi north ave direct pmd and answered with correct call sign. Unfortunately, air carrier Y was northbound at FL310. I noticed air carrier X climbing, then turned, then left 070 degrees, maintain present altitude. Also turned air carrier Y left 250 degrees. Air carrier Y responded he already saw company and turned.

Original NASA ASRS Text

Title: OPERROR LESS WHEN RPTR ISSUED CLB INSTRUCTION USING THE WRONG CALL SIGN. ACFT CONFLICTED WITH OPPOSITE DIRECTION COMPANY ACFT WHICH TOOK EVASIVE ACTION UPON SIGHTING THE CLBING ACFT.

Narrative: WHILE VECTORING ACR Z FOR TFC, ACCIDENTALLY USED ACR X'S CALL SIGN 25 MI N AVE DIRECT PMD AND ANSWERED WITH CORRECT CALL SIGN. UNFORTUNATELY, ACR Y WAS NBOUND AT FL310. I NOTICED ACR X CLBING, THEN TURNED, THEN L 070 DEGS, MAINTAIN PRESENT ALT. ALSO TURNED ACR Y L 250 DEGS. ACR Y RESPONDED HE ALREADY SAW COMPANY AND TURNED.

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.