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

Attributes
ACN	167498
Time
Date	199101
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : fwa
State Reference	IN
Altitude	msl bound lower : 15000 msl bound upper : 20000
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zid artcc : zau
Operator	common carrier : air carrier
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	descent other
Route In Use	enroute : direct
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
ASRS Report	167498
Person 2
Affiliation	government : faa
Function	controller : radar
Qualification	controller : developmental
ASRS Report	167643
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 : 18000 vertical : 400
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Inter Facility Coordination Failure Operational Error

Narrative:

Air carrier X was sebnd toward rod, descending from FL230 to 15000'. Air carrier Y was passenger direct fwa climbing to FL200. I recognized the conflict and when my trnee didn't take the proper action, I issued vectors to air carrier Y and told ZAU to issue a 060 degree heading to air carrier X. ZAU misunderstood my request and never issued the 060 degree heading. Air carrier Y was told 'far traffic, turn left heading 270 degrees, tight turn for traffic.' 40 seconds after the clearance was issued, the aircraft's track had changed 2 degrees. Supplemental information from acn 167643: air carrier Y nwbnd from dqn direction fwa climbing to FL200. Air carrier X sebnd rod direct rod descending from FL230 to 15000'. I was radar training and recognized the conflict and called ZAU to stop air carrier X and try to use vertical sep. At this time instrument intervened and issued a vector to ZAU for air carrier X. Instrument then issued a vector to air carrier Y.

Original NASA ASRS Text

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

Narrative: ACR X WAS SEBND TOWARD ROD, DSNDING FROM FL230 TO 15000'. ACR Y WAS PAX DIRECT FWA CLBING TO FL200. I RECOGNIZED THE CONFLICT AND WHEN MY TRNEE DIDN'T TAKE THE PROPER ACTION, I ISSUED VECTORS TO ACR Y AND TOLD ZAU TO ISSUE A 060 DEG HDG TO ACR X. ZAU MISUNDERSTOOD MY REQUEST AND NEVER ISSUED THE 060 DEG HDG. ACR Y WAS TOLD 'FAR TFC, TURN LEFT HDG 270 DEGS, TIGHT TURN FOR TFC.' 40 SECS AFTER THE CLRNC WAS ISSUED, THE ACFT'S TRACK HAD CHANGED 2 DEGS. SUPPLEMENTAL INFO FROM ACN 167643: ACR Y NWBND FROM DQN DIRECTION FWA CLBING TO FL200. ACR X SEBND ROD DIRECT ROD DSNDING FROM FL230 TO 15000'. I WAS RADAR TRNING AND RECOGNIZED THE CONFLICT AND CALLED ZAU TO STOP ACR X AND TRY TO USE VERT SEP. AT THIS TIME INSTR INTERVENED AND ISSUED A VECTOR TO ZAU FOR ACR X. INSTR THEN ISSUED A VECTOR TO ACR Y.

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.