Medium large transport crew had TCASII in ZAU class east airspace.

Attributes
ACN	489549
Time
Date	200010
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : ord.airport
State Reference	IL
Altitude	msl bound lower : 10000 msl bound upper : 11200
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zau.artcc
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	climbout : vacating altitude
Route In Use	departure : on vectors
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 : captain oversight : pic
Qualification	pilot : instrument pilot : flight engineer pilot : commercial pilot : cfi pilot : atp pilot : multi engine
Experience	flight time last 90 days : 240 flight time total : 19000 flight time type : 240
ASRS Report	489549
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : cfi pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 220 flight time total : 6000 flight time type : 220
ASRS Report	490570
Events
Anomaly	conflict : airborne less severe other anomaly other
Independent Detector	aircraft equipment : tcas other flight crewa other flight crewb
Resolutory Action	flight crew : took precautionary avoidance action
Miss Distance	vertical : 1200
Supplementary
Problem Areas	FAA Airspace Structure
Primary Problem	Ambiguous

Narrative:

Cleared to 13000 ft, expedite through 8000 ft, then turned northeast. Coming up on 10000 ft, TCASII TA traffic was announced. Traffic was at 11200 ft. We stopped climb at 10000 ft (plenty of separation). This is twice in 4 months where TCASII really helped. I'm not sure I would fly in a busy area without it.

Original NASA ASRS Text

Title: MLG CREW HAD TCASII IN ZAU CLASS E AIRSPACE.

Narrative: CLRED TO 13000 FT, EXPEDITE THROUGH 8000 FT, THEN TURNED NE. COMING UP ON 10000 FT, TCASII TA TFC WAS ANNOUNCED. TFC WAS AT 11200 FT. WE STOPPED CLB AT 10000 FT (PLENTY OF SEPARATION). THIS IS TWICE IN 4 MONTHS WHERE TCASII REALLY HELPED. I'M NOT SURE I WOULD FLY IN A BUSY AREA WITHOUT IT.

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.