ZOB assistant controller becomes aware of a loss of standard separation when conflict alert activates. A climbing C650 comes into conflict with a descending A319 being vectored clear of another air carrier.

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Attributes
ACN	430810
Time
Date	199903
Day	Wed
Local Time Of Day	0001 To 0600
Place
Locale Reference	navaid : vwv.vor
State Reference	TN
Altitude	msl single value : 35000
Environment
Flight Conditions	IMC VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zob.artcc
Operator	common carrier : air carrier
Make Model Name	A319
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zob.artcc
Operator	general aviation : corporate
Make Model Name	Citation III, VI, VII
Operating Under FAR Part	Part 91
Flight Phase	cruise : enroute altitude change descent : intermediate altitude
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : handoff position
Qualification	controller : developmental
Experience	controller radar : 1.6
ASRS Report	430310
Person 2
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : required legal separation
Independent Detector	atc equipment : conflict alert aircraft equipment : tcas other controllera
Consequence	faa : investigated
Miss Distance	horizontal : 19600 vertical : 1300
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Aircraft X eastbound was stopped at FL350 (wrong altitude for direction of flight) by ZAU because of the 2 FL370 traffic that they gave us and we were vectoring because they appeared on converging courses. Aircraft Y midway arrival was descended to FL350 because of FL330 traffic. Aircraft Y was given a crossing restr from gsh at FL310. During this time the radar controller was trying to stop an jet clber off from cmh climbing to FL330 nebound. We had dtw air carrier Z traffic requesting FL410 but stopped at FL330, sebound due to FL350 crossing traffic. The radar controller called at least 2 sectors trying to locate who was working the jet traffic. My first awareness of the conflict was the conflict alert. In conclusion the causal factors were: 1) FL370 converging traffic from ZAU. 2) FL350 wrong altitude for direction of flight due to #1 aircraft. 3) jet climbing traffic. 4) complexity of sector due to many aircraft and crossing traffic. 5) I spent a great deal of time managing the strips due to the number of aircraft.

Original NASA ASRS Text

Title: ZOB ASSISTANT CTLR BECOMES AWARE OF A LOSS OF STANDARD SEPARATION WHEN CONFLICT ALERT ACTIVATES. A CLBING C650 COMES INTO CONFLICT WITH A DSNDING A319 BEING VECTORED CLR OF ANOTHER ACR.

Narrative: ACFT X EBOUND WAS STOPPED AT FL350 (WRONG ALT FOR DIRECTION OF FLT) BY ZAU BECAUSE OF THE 2 FL370 TFC THAT THEY GAVE US AND WE WERE VECTORING BECAUSE THEY APPEARED ON CONVERGING COURSES. ACFT Y MIDWAY ARR WAS DSNDED TO FL350 BECAUSE OF FL330 TFC. ACFT Y WAS GIVEN A XING RESTR FROM GSH AT FL310. DURING THIS TIME THE RADAR CTLR WAS TRYING TO STOP AN JET CLBER OFF FROM CMH CLBING TO FL330 NEBOUND. WE HAD DTW ACR Z TFC REQUESTING FL410 BUT STOPPED AT FL330, SEBOUND DUE TO FL350 XING TFC. THE RADAR CTLR CALLED AT LEAST 2 SECTORS TRYING TO LOCATE WHO WAS WORKING THE JET TFC. MY FIRST AWARENESS OF THE CONFLICT WAS THE CONFLICT ALERT. IN CONCLUSION THE CAUSAL FACTORS WERE: 1) FL370 CONVERGING TFC FROM ZAU. 2) FL350 WRONG ALT FOR DIRECTION OF FLT DUE TO #1 ACFT. 3) JET CLBING TFC. 4) COMPLEXITY OF SECTOR DUE TO MANY ACFT AND XING TFC. 5) I SPENT A GREAT DEAL OF TIME MANAGING THE STRIPS DUE TO THE NUMBER OF ACFT.

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.