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

Attributes
ACN	135798
Time
Date	199002
Day	Mon
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : ttn
State Reference	IN
Altitude	msl bound lower : 33000 msl bound upper : 33000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zid
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise other
Route In Use	enroute : on vectors enroute : direct
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	climbout : intermediate altitude cruise other
Route In Use	enroute : on vectors enroute : direct
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
ASRS Report	135798
Person 2
Function	flight crew : single pilot
Qualification	pilot : instrument
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 : 28200 vertical : 200
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Aircraft X was wsw bound descended from FL350 to FL310. Air carrier Y was level at FL330, requesting 370 and climbed to 370. Air carrier Y then requested to stay at 330. Air carrier Y was turned to a 230 heading (approximately a turn of 60 degree). Air carrier Y asked to stay on course and climbed. Reissued the 230 degree heading. Eventually turned to 270 degree and aircraft X turned to 180 degree (approximately a turn of 70 degree left). Separation was lost.

Original NASA ASRS Text

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

Narrative: ACFT X WAS WSW BOUND DESCENDED FROM FL350 TO FL310. ACR Y WAS LEVEL AT FL330, REQUESTING 370 AND CLIMBED TO 370. ACR Y THEN REQUESTED TO STAY AT 330. ACR Y WAS TURNED TO A 230 HDG (APPROX A TURN OF 60 DEG). ACR Y ASKED TO STAY ON COURSE AND CLIMBED. REISSUED THE 230 DEG HDG. EVENTUALLY TURNED TO 270 DEG AND ACFT X TURNED TO 180 DEG (APPROX A TURN OF 70 DEG LEFT). SEPARATION WAS LOST.

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.