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

Attributes
ACN	149682
Time
Date	199006
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : mie
State Reference	IN
Altitude	msl bound lower : 12000 msl bound upper : 12000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zid
Operator	common carrier : air carrier
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise other descent other
Route In Use	enroute : direct
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise other
Route In Use	enroute : direct
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller military : 10 controller radar : 9
ASRS Report	149682
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation non adherence : published procedure
Independent Detector	atc equipment other atc equipment : unspecified
Resolutory Action	controller : issued new clearance other
Consequence	faa : investigated
Miss Distance	horizontal : 9000 vertical : 100
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

1XX:26:08, air carrier X was cleared to descend to 7120. Xx:27:06, aircraft Y initial call over mie requesting IFR clearance. Xx:28:16, air carrier X was cleared to maintain 130. Air carrier X did not acknowledge for the clearance. Xx:29:09, aircraft Y was advised to squawk code XXXY. Xx:29:41, aircraft Y was radar idented and issued IFR clearance to maintain 120. Xx:30:26, aircraft Y reported level at 120. Xx:31:24 aedp activated. Xx:31:29, air carrier X was turned right to a 270 degree heading and advised that he had traffic off his left at 120.

Original NASA ASRS Text

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

Narrative: 1XX:26:08, ACR X WAS CLRED TO DSND TO 7120. XX:27:06, ACFT Y INITIAL CALL OVER MIE REQUESTING IFR CLRNC. XX:28:16, ACR X WAS CLRED TO MAINTAIN 130. ACR X DID NOT ACKNOWLEDGE FOR THE CLRNC. XX:29:09, ACFT Y WAS ADVISED TO SQUAWK CODE XXXY. XX:29:41, ACFT Y WAS RADAR IDENTED AND ISSUED IFR CLRNC TO MAINTAIN 120. XX:30:26, ACFT Y RPTED LEVEL AT 120. XX:31:24 AEDP ACTIVATED. XX:31:29, ACR X WAS TURNED R TO A 270 DEG HDG AND ADVISED THAT HE HAD TFC OFF HIS L AT 120.

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.