MD80 flight crew has a TCASII RA during the final approach into ord.

Attributes
ACN	593435
Time
Date	200309
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : ord.airport
State Reference	IL
Altitude	msl single value : 2200
Aircraft 1
Controlling Facilities	tracon : c90.tracon tower : ord.tower
Operator	common carrier : air carrier
Make Model Name	MD-80 Series (DC-9-80) Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	ils localizer & glide slope : 22r
Flight Phase	descent : approach
Route In Use	approach : instrument precision
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : c90.tracon
Operator	general aviation : personal
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Flight Phase	cruise : level
Flight Plan	None
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	593435
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne critical non adherence : far non adherence : required legal separation
Independent Detector	other controllera other flight crewa other flight crewb
Resolutory Action	controller : issued advisory
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	ATC Human Performance Flight Crew Human Performance
Primary Problem	Ambiguous

Narrative:

2 mi from FAF established at 2200 ft on ILS runway 22R traffic called at 2000 ft at 10 or 11 O'clock position. Crew picked up visually with immediate concern for midair potential. Responded to RA aircraft cleared below us at 500 ft. We were unable to descend to runway from that altitude. I contacted ord TRACON and they said aircraft was in class B airspace at 1900 ft. This was a serious situation (direct conflict at the FAF) and should be reviewed by all safety aspects.

Original NASA ASRS Text

Title: MD80 FLT CREW HAS A TCASII RA DURING THE FINAL APCH INTO ORD.

Narrative: 2 MI FROM FAF ESTABLISHED AT 2200 FT ON ILS RWY 22R TFC CALLED AT 2000 FT AT 10 OR 11 O'CLOCK POS. CREW PICKED UP VISUALLY WITH IMMEDIATE CONCERN FOR MIDAIR POTENTIAL. RESPONDED TO RA ACFT CLRED BELOW US AT 500 FT. WE WERE UNABLE TO DSND TO RWY FROM THAT ALT. I CONTACTED ORD TRACON AND THEY SAID ACFT WAS IN CLASS B AIRSPACE AT 1900 FT. THIS WAS A SERIOUS SIT (DIRECT CONFLICT AT THE FAF) AND SHOULD BE REVIEWED BY ALL SAFETY ASPECTS.

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.