Air carrier X descent to occupied altitude had less than standard separation from air carrier Y. Sys...

Attributes
ACN	264574
Time
Date	199402
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : iiu
State Reference	KY
Altitude	msl bound lower : 33000 msl bound upper : 33000
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zid
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	cruise other
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
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 : 4 controller non radar : 7 controller radar : 4
ASRS Report	264574
Person 2
Affiliation	government : faa
Function	oversight : supervisor
Qualification	controller : radar
Experience	controller radar : 9 controller supervisory : 3
ASRS Report	264105
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation non adherence : published procedure
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance other
Consequence	faa : investigated
Miss Distance	horizontal : 24000
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error Intra Facility Coordination Failure

Narrative:

Air carrier X was northbound on J89. Air carrier Z was wbound on J6. Air carrier X was turned left to go in front of air carrier Z. The separation was not enough, so I turned both aircraft left,, air carrier X 300 degree heading and air carrier Z to a 200 degree heading, and coordinated a lower altitude on air carrier X. The controller in the sector below mine approved FL330. I descended air carrier X then noticed air carrier Y at FL330. I turned air carrier X to a 360 degree heading, then a 030 degree heading. Separation was lost at that point. The controller in the lower sector was not aware of that. Air carrier X was turning left to the initial 300 degree heading. Supplemental information from acn 264105: bad coordination between controllers resulted in loss of standard separation. Headings/radar vectors not assigned on aircraft that were crossing at FL330.

Original NASA ASRS Text

Title: ACR X DSCNT TO OCCUPIED ALT HAD LTSS FROM ACR Y. SYS ERROR.

Narrative: ACR X WAS NBOUND ON J89. ACR Z WAS WBOUND ON J6. ACR X WAS TURNED L TO GO IN FRONT OF ACR Z. THE SEPARATION WAS NOT ENOUGH, SO I TURNED BOTH ACFT L,, ACR X 300 DEG HDG AND ACR Z TO A 200 DEG HDG, AND COORDINATED A LOWER ALT ON ACR X. THE CTLR IN THE SECTOR BELOW MINE APPROVED FL330. I DSNDED ACR X THEN NOTICED ACR Y AT FL330. I TURNED ACR X TO A 360 DEG HDG, THEN A 030 DEG HDG. SEPARATION WAS LOST AT THAT POINT. THE CTLR IN THE LOWER SECTOR WAS NOT AWARE OF THAT. ACR X WAS TURNING L TO THE INITIAL 300 DEG HDG. SUPPLEMENTAL INFO FROM ACN 264105: BAD COORD BTWN CTLRS RESULTED IN LOSS OF STANDARD SEPARATION. HDGS/RADAR VECTORS NOT ASSIGNED ON ACFT THAT WERE XING AT FL330.

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.

Air carrier X descent to occupied altitude had less than standard separation from air carrier Y. System error.