ARTCC controller failed to maintain required separation between aircraft due to misjudging the vector needed for the trailing aircraft to maintain standard separation.

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Attributes
ACN	542632
Time
Date	200203
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	navaid : cgt.vortac
State Reference	IN
Altitude	msl single value : 7000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zau.artcc
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	descent : approach
Route In Use	arrival : on vectors
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zau.artcc
Operator	general aviation : corporate
Make Model Name	Gulfstream IV
Operating Under FAR Part	Part 91
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar instruction : instructor
Qualification	controller : radar
Experience	flight time total : 600
ASRS Report	542632
Person 2
Affiliation	government : faa
Function	controller : radar instruction : trainee
Qualification	controller : developmental
Events
Anomaly	non adherence : required legal separation
Independent Detector	other controllera
Resolutory Action	none taken : anomaly accepted
Miss Distance	horizontal : 24600 vertical : 200
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Aircraft #1 was being vectored for sequence to mdw localizer runway 31C behind aircraft #2. Amount of vector for aircraft #1 was misjudged and did not maintain 5 mi separation behind aircraft #2.

Original NASA ASRS Text

Title: ARTCC CTLR FAILED TO MAINTAIN REQUIRED SEPARATION BTWN ACFT DUE TO MISJUDGING THE VECTOR NEEDED FOR THE TRAILING ACFT TO MAINTAIN STANDARD SEPARATION.

Narrative: ACFT #1 WAS BEING VECTORED FOR SEQUENCE TO MDW LOC RWY 31C BEHIND ACFT #2. AMOUNT OF VECTOR FOR ACFT #1 WAS MISJUDGED AND DID NOT MAINTAIN 5 MI SEPARATION BEHIND ACFT #2.

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.