Medium large transport air carrier crew had a TCASII RA in ord class B airspace.

Attributes
ACN	455533
Time
Date	199911
Day	Sat
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : ord.airport
State Reference	IL
Altitude	msl single value : 5000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : c90.tracon
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 2 Turbojet Eng
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : c90.tracon
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	climbout : vacating altitude
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 10000
ASRS Report	455533
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : multi engine pilot : commercial
Events
Anomaly	conflict : airborne critical non adherence : far non adherence : required legal separation non adherence : published procedure
Independent Detector	aircraft equipment : tcas other flight crewa other flight crewb
Resolutory Action	controller : issued alert flight crew : took evasive action
Miss Distance	horizontal : 3000 vertical : 200
Supplementary
Problem Areas	ATC Human Performance Flight Crew Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

I was flying aircraft on departure from ord. We were level at 5000 ft on heading 090 degrees. ATC issued us a 360 degree heading which was read back with flight number by the captain. There was no question with either of us that it was for us. A few mins later we were issued an immediate turn to 120 degrees and told our heading was supposed to be 100 degrees. We saw another aircraft on TCASII climbing and was only 200 ft below and appeared to be within 1/2 mi and closing. I made an immediate hard right turn and missed traffic. We never saw the aircraft visually and ATC never explained what was the original mistake or who made the error. Regardless of who made the original mistake, quick action by ATC and TCASII enabled us to recognize and avoid further conflict.

Original NASA ASRS Text

Title: MLG ACR CREW HAD A TCASII RA IN ORD CLASS B AIRSPACE.

Narrative: I WAS FLYING ACFT ON DEP FROM ORD. WE WERE LEVEL AT 5000 FT ON HDG 090 DEGS. ATC ISSUED US A 360 DEG HDG WHICH WAS READ BACK WITH FLT NUMBER BY THE CAPT. THERE WAS NO QUESTION WITH EITHER OF US THAT IT WAS FOR US. A FEW MINS LATER WE WERE ISSUED AN IMMEDIATE TURN TO 120 DEGS AND TOLD OUR HDG WAS SUPPOSED TO BE 100 DEGS. WE SAW ANOTHER ACFT ON TCASII CLBING AND WAS ONLY 200 FT BELOW AND APPEARED TO BE WITHIN 1/2 MI AND CLOSING. I MADE AN IMMEDIATE HARD R TURN AND MISSED TFC. WE NEVER SAW THE ACFT VISUALLY AND ATC NEVER EXPLAINED WHAT WAS THE ORIGINAL MISTAKE OR WHO MADE THE ERROR. REGARDLESS OF WHO MADE THE ORIGINAL MISTAKE, QUICK ACTION BY ATC AND TCASII ENABLED US TO RECOGNIZE AND AVOID FURTHER CONFLICT.

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.