Air carrier X had less than standard separation from cpr Y. System error.

Attributes
ACN	122484
Time
Date	198909
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : nid
State Reference	IN
Altitude	msl bound lower : 5000 msl bound upper : 5000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : ind
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	cruise other
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	general aviation : corporate
Make Model Name	Small Transport, Low Wing, 2 Turbojet Eng
Flight Phase	cruise other
Route In Use	enroute : direct
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : departure
Qualification	controller : radar
ASRS Report	122484
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
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance other
Consequence	Other
Miss Distance	horizontal : 6000 vertical : 0
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

I was working departure east radar at ind approach. When I issued a turn to air carrier X medium large transport that was meant for company aircraft, the air carrier X came into conflict with a cpr Y light transport about 8 mi north of ind. When I saw the conflict, I climbed cpr Y and turned the air carrier X. Like sounding call signs, ie, same company xya and yya.

Original NASA ASRS Text

Title: ACR X HAD LESS THAN STANDARD SEPARATION FROM CPR Y. SYSTEM ERROR.

Narrative: I WAS WORKING DEP E RADAR AT IND APCH. WHEN I ISSUED A TURN TO ACR X MLG THAT WAS MEANT FOR COMPANY ACFT, THE ACR X CAME INTO CONFLICT WITH A CPR Y LTT ABOUT 8 MI N OF IND. WHEN I SAW THE CONFLICT, I CLBED CPR Y AND TURNED THE ACR X. LIKE SOUNDING CALL SIGNS, IE, SAME COMPANY XYA AND YYA.

Data retrieved from NASA's ASRS site as of August 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.