ARTCC radar controller climbed a LR25 to an altitude already occupied by a BE90. The manual controller spotted the potential conflict and pointed it out to the radar controller. The radar controller was unable to stop the LR25 before separation was lost.

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Attributes
ACN	349561
Time
Date	199610
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : mfd
State Reference	OH
Altitude	msl bound lower : 23000 msl bound upper : 23000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zob
Operator	general aviation : personal
Make Model Name	Learjet 25
Operating Under FAR Part	Part 91
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Aircraft 2
Operator	general aviation : personal
Make Model Name	King Air C90 E90
Operating Under FAR Part	Part 91
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar pilot : private
Experience	controller radar : 13 flight time total : 100
ASRS Report	349561
Person 2
Affiliation	government : faa
Function	controller : non radar
Experience	controller non radar : 2 controller radar : 11
ASRS Report	349562
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance other
Consequence	Other
Miss Distance	horizontal : 6600 vertical : 500
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

I climbed the lear to FL230 with the king air already there and seeing he was still below FL220, tried to stop him at FL220 and heard 'we'll stay right here then,' but it was another aircraft talking and the lear continued to climb to FL230. It was fairly busy at the time of the incident and the d-side was the first to notice the problem. Supplemental information from acn 349562: LR25 was climbing to FL230, a BE90 was in level flight at FL230. I brought this confliction to the attention of the radar controller. LR25 was leaving FL215 when I noticed the confliction. The aircraft were about 6-7 mi apart. The radar controller reacted immediately to separate the aircraft, but there was not enough time and separation was lost. There was a lot of complex traffic up to the time separation was lost. I was the radar associate and was distraction from the radar scope when I had to call the rav sector to point out the LR25 to them so he could climb to FL270 in their airspace.

Original NASA ASRS Text

Title: ARTCC RADAR CTLR CLBED A LR25 TO AN ALT ALREADY OCCUPIED BY A BE90. THE MANUAL CTLR SPOTTED THE POTENTIAL CONFLICT AND POINTED IT OUT TO THE RADAR CTLR. THE RADAR CTLR WAS UNABLE TO STOP THE LR25 BEFORE SEPARATION WAS LOST.

Narrative: I CLBED THE LEAR TO FL230 WITH THE KING AIR ALREADY THERE AND SEEING HE WAS STILL BELOW FL220, TRIED TO STOP HIM AT FL220 AND HEARD 'WE'LL STAY RIGHT HERE THEN,' BUT IT WAS ANOTHER ACFT TALKING AND THE LEAR CONTINUED TO CLB TO FL230. IT WAS FAIRLY BUSY AT THE TIME OF THE INCIDENT AND THE D-SIDE WAS THE FIRST TO NOTICE THE PROB. SUPPLEMENTAL INFO FROM ACN 349562: LR25 WAS CLBING TO FL230, A BE90 WAS IN LEVEL FLT AT FL230. I BROUGHT THIS CONFLICTION TO THE ATTN OF THE RADAR CTLR. LR25 WAS LEAVING FL215 WHEN I NOTICED THE CONFLICTION. THE ACFT WERE ABOUT 6-7 MI APART. THE RADAR CTLR REACTED IMMEDIATELY TO SEPARATE THE ACFT, BUT THERE WAS NOT ENOUGH TIME AND SEPARATION WAS LOST. THERE WAS A LOT OF COMPLEX TFC UP TO THE TIME SEPARATION WAS LOST. I WAS THE RADAR ASSOCIATE AND WAS DISTR FROM THE RADAR SCOPE WHEN I HAD TO CALL THE RAV SECTOR TO POINT OUT THE LR25 TO THEM SO HE COULD CLB TO FL270 IN THEIR AIRSPACE.

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.