Atx Y climb through occupied altitude had less than standard separation from atx X. System error.

Attributes
ACN	243978
Time
Date	199306
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : rod
State Reference	OH
Altitude	msl bound lower : 13000 msl bound upper : 13000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air taxi
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise other
Route In Use	enroute : direct enroute airway : zid
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air taxi
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	climbout : intermediate altitude
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller non radar : 3 controller radar : 1
ASRS Report	243978
Person 2
Affiliation	government : faa
Function	oversight : supervisor
Qualification	controller : radar
Experience	controller radar : 11 controller supervisory : 3
ASRS Report	243818
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 : 24600 vertical : 500
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Atx X was sebound at 13000 ft. Atx Y just departed dayton, oh, and was on a heading of 360 degrees, climbing to 10000 ft. Atx Y was climbed to 12000 ft and assigned a heading of 060 degrees to join V435 on course. Atx X was cleared direct manes intersection and the BLUNT7 arrival to cvg. I then decided to keep atx Y climbing for additional traffic. I climbed him to 15000 ft and assigned a heading of 020 degrees to ensure separation from atx X. I then assigned atx X present heading. I then turned atx Y to a heading of 330 degrees and descended him back down to 12000 ft. I climbed atx X to 14000 ft and assigned him a heading of 090 degrees. Closest point being 4.1 mi horizontal and 500 ft vertical. Supplemental information from acn 243818: controller gave up the vertical separation he had established before lateral separation was effected. That is, air carrier X was at 12000 ft and air carrier Y was at 13000 ft. While still closing, but with significant lateral separation, the controller climbed air carrier X.

Original NASA ASRS Text

Title: ATX Y CLB THROUGH OCCUPIED ALT HAD LTSS FROM ATX X. SYS ERROR.

Narrative: ATX X WAS SEBOUND AT 13000 FT. ATX Y JUST DEPARTED DAYTON, OH, AND WAS ON A HDG OF 360 DEGS, CLBING TO 10000 FT. ATX Y WAS CLBED TO 12000 FT AND ASSIGNED A HDG OF 060 DEGS TO JOIN V435 ON COURSE. ATX X WAS CLRED DIRECT MANES INTXN AND THE BLUNT7 ARR TO CVG. I THEN DECIDED TO KEEP ATX Y CLBING FOR ADDITIONAL TFC. I CLBED HIM TO 15000 FT AND ASSIGNED A HDG OF 020 DEGS TO ENSURE SEPARATION FROM ATX X. I THEN ASSIGNED ATX X PRESENT HDG. I THEN TURNED ATX Y TO A HDG OF 330 DEGS AND DSNDED HIM BACK DOWN TO 12000 FT. I CLBED ATX X TO 14000 FT AND ASSIGNED HIM A HDG OF 090 DEGS. CLOSEST POINT BEING 4.1 MI HORIZ AND 500 FT VERT. SUPPLEMENTAL INFORMATION FROM ACN 243818: CTLR GAVE UP THE VERT SEPARATION HE HAD ESTABLISHED BEFORE LATERAL SEPARATION WAS EFFECTED. THAT IS, ACR X WAS AT 12000 FT AND ACR Y WAS AT 13000 FT. WHILE STILL CLOSING, BUT WITH SIGNIFICANT LATERAL SEPARATION, THE CTLR CLBED ACR X.

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.