MD82 and unidented aircraft had less than legal separation that resulted in a TCASII RA in ZAU class...

Attributes
ACN	534516
Time
Date	200201
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	navaid : fwa.vortac
State Reference	IN
Altitude	msl single value : 27000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zau.artcc
Operator	common carrier : air carrier
Make Model Name	MD-82
Operating Under FAR Part	Part 121
Navigation In Use	other vortac
Flight Phase	cruise : level
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zau.artcc
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : flight engineer pilot : instrument pilot : multi engine pilot : atp
Experience	flight time last 90 days : 100 flight time total : 6625 flight time type : 2000
ASRS Report	534516
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	conflict : airborne critical non adherence : far non adherence : published procedure other anomaly other
Independent Detector	aircraft equipment : tcas other controllera other flight crewa other flight crewb
Resolutory Action	controller : issued new clearance flight crew : took evasive action none taken : detected after the fact other
Miss Distance	horizontal : 6000 vertical : 400
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

I was the first officer on air carrier X flight abc dtw to stl, level at FL270 over fwa VOR. We received an RA on the TCASII that said 'climb.' at the same time, the controller said to turn to 350 degrees which was 90 degrees off our wbound heading. I disconnected the autoplt, initiated a climb and turned north. At FL274, the TCASII said 'clear of conflict.' the captain told the controller of the RA and maneuver. The controller then cleared us back on course. This all happened within 5 seconds and we never saw the traffic.

Original NASA ASRS Text

Title: MD82 AND UNIDENTED ACFT HAD LESS THAN LEGAL SEPARATION THAT RESULTED IN A TCASII RA IN ZAU CLASS A AIRSPACE.

Narrative: I WAS THE FO ON ACR X FLT ABC DTW TO STL, LEVEL AT FL270 OVER FWA VOR. WE RECEIVED AN RA ON THE TCASII THAT SAID 'CLB.' AT THE SAME TIME, THE CTLR SAID TO TURN TO 350 DEGS WHICH WAS 90 DEGS OFF OUR WBOUND HDG. I DISCONNECTED THE AUTOPLT, INITIATED A CLB AND TURNED N. AT FL274, THE TCASII SAID 'CLR OF CONFLICT.' THE CAPT TOLD THE CTLR OF THE RA AND MANEUVER. THE CTLR THEN CLRED US BACK ON COURSE. THIS ALL HAPPENED WITHIN 5 SECONDS AND WE NEVER SAW THE TFC.

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.

MD82 and unidented aircraft had less than legal separation that resulted in a TCASII RA in ZAU class a airspace.