Emj flight crew has TCASII RA during approach to ord.

Attributes
ACN	592606
Time
Date	200309
Day	Tue
Place
Locale Reference	airport : ord.airport
State Reference	IL
Altitude	msl bound lower : 5000 msl bound upper : 5400
Aircraft 1
Controlling Facilities	tracon : c90.tracon
Operator	common carrier : air carrier
Make Model Name	Embraer Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	ils localizer & glide slope : 9r
Flight Phase	descent : approach
Route In Use	approach : instrument precision arrival : on vectors
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : c90.tracon
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Flight Phase	cruise other
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	592606
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne critical inflight encounter : weather
Independent Detector	aircraft equipment : tcas other flight crewa other flight crewb
Resolutory Action	controller : issued advisory flight crew : took precautionary avoidance action flight crew : took evasive action
Supplementary
Problem Areas	Weather ATC Human Performance Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

We were being given vectors to intercept the ILS runway 9R at ord and on our base leg, approximately 20 NM out from ord. We had first a TA, then an RA, on TCASII. At the same time we had the RA, ord ATC informed us that the traffic had just shown up on his radar. We had just intercepted runway 9R and had to climb 3400 ft. During the climb, I noticed a low wing GA aircraft circling right above a cloud layer. After the RA, we returned to our assigned altitude of 5000 ft to continue the approach without further incident.

Original NASA ASRS Text

Title: EMJ FLT CREW HAS TCASII RA DURING APCH TO ORD.

Narrative: WE WERE BEING GIVEN VECTORS TO INTERCEPT THE ILS RWY 9R AT ORD AND ON OUR BASE LEG, APPROX 20 NM OUT FROM ORD. WE HAD FIRST A TA, THEN AN RA, ON TCASII. AT THE SAME TIME WE HAD THE RA, ORD ATC INFORMED US THAT THE TFC HAD JUST SHOWN UP ON HIS RADAR. WE HAD JUST INTERCEPTED RWY 9R AND HAD TO CLB 3400 FT. DURING THE CLB, I NOTICED A LOW WING GA ACFT CIRCLING RIGHT ABOVE A CLOUD LAYER. AFTER THE RA, WE RETURNED TO OUR ASSIGNED ALT OF 5000 FT TO CONTINUE THE APCH WITHOUT FURTHER INCIDENT.

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.