Departure controller observed a B757 aircraft under his control execute a TCASII RA in C90 class B a...

Attributes
ACN	485818
Time
Date	200009
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : ord.airport
State Reference	IL
Altitude	msl bound lower : 5000 msl bound upper : 6500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Flight Phase	climbout : vacating altitude
Route In Use	departure : on vectors
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : c90.tracon
Operator	common carrier : air carrier
Make Model Name	EMB ERJ 145 ER&LR
Operating Under FAR Part	Part 121
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : departure
Experience	controller military : 8 controller radar : 18
ASRS Report	485818
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : airborne critical other anomaly other
Independent Detector	aircraft equipment : tcas other controllera other flight crewa
Resolutory Action	flight crew : took evasive action
Miss Distance	horizontal : 15000 vertical : 500
Supplementary
Problem Areas	Airspace Structure Flight Crew Human Performance Aircraft
Primary Problem	Ambiguous

Narrative:

Air carrier X departed runway 27, heading 270 degrees, climbing to 5000 ft. 5 mi west of ord, air carrier X reported an RA and was climbing. Air carrier X reported traffic in front of him at 5500 ft. I observed no conflicting traffic in his vicinity. Air carrier Y was 4 mi southeast, level at 7000 ft, nwbound. Air carrier Y passed 2.5 mi behind air carrier X. Air carrier X stopped his climb at 6500 ft.

Original NASA ASRS Text

Title: DEP CTLR OBSERVED A B757 ACFT UNDER HIS CTL EXECUTE A TCASII RA IN C90 CLASS B AIRSPACE.

Narrative: ACR X DEPARTED RWY 27, HDG 270 DEGS, CLBING TO 5000 FT. 5 MI W OF ORD, ACR X RPTED AN RA AND WAS CLBING. ACR X RPTED TFC IN FRONT OF HIM AT 5500 FT. I OBSERVED NO CONFLICTING TFC IN HIS VICINITY. ACR Y WAS 4 MI SE, LEVEL AT 7000 FT, NWBOUND. ACR Y PASSED 2.5 MI BEHIND ACR X. ACR X STOPPED HIS CLB AT 6500 FT.

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.

Departure controller observed a B757 aircraft under his control execute a TCASII RA in C90 class B airspace.