Air carrier flight crew responded to a TCASII warning and climbed the aircraft during descent for approach resulting in an near midair collision with another aircraft.

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Attributes
ACN	206888
Time
Date	199204
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : mdw
State Reference	IL
Altitude	msl bound lower : 4000 msl bound upper : 4800
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : ord
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	descent : approach descent other
Flight Plan	IFR
Aircraft 2
Make Model Name	Small Aircraft
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 210
ASRS Report	206888
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : nmac other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course
Consequence	Other
Miss Distance	horizontal : 100 vertical : 300
Supplementary
Primary Problem	Flight Crew Human Performance

Narrative:

Approximately 8 DME from the IAF to runway 31C at chicago's midway airport on an intercept heading to join the localizer our TCASII indicated a TA (conflict) followed shortly thereafter by an RA to initiate a climb. An immediate climb was initiated to avoid the traffic. Traffic was visually referenced as he passed off the left side of the aircraft. We climbed from 4000-4800 ft before the TCASII indicated that we were clear of traffic. The controller never advised us of the traffic. Once we were clear of traffic we advised the controller of a near miss and proceeded to midway and landed. Major problem: the approach leading into mdw is over numerous private airports and all the airspace in uncontrolled!

Original NASA ASRS Text

Title: ACR FLC RESPONDED TO A TCASII WARNING AND CLBED THE ACFT DURING DSCNT FOR APCH RESULTING IN AN NMAC WITH ANOTHER ACFT.

Narrative: APPROX 8 DME FROM THE IAF TO RWY 31C AT CHICAGO'S MIDWAY ARPT ON AN INTERCEPT HDG TO JOIN THE LOC OUR TCASII INDICATED A TA (CONFLICT) FOLLOWED SHORTLY THEREAFTER BY AN RA TO INITIATE A CLB. AN IMMEDIATE CLB WAS INITIATED TO AVOID THE TFC. TFC WAS VISUALLY REFED AS HE PASSED OFF THE L SIDE OF THE ACFT. WE CLBED FROM 4000-4800 FT BEFORE THE TCASII INDICATED THAT WE WERE CLR OF TFC. THE CTLR NEVER ADVISED US OF THE TFC. ONCE WE WERE CLR OF TFC WE ADVISED THE CTLR OF A NEAR MISS AND PROCEEDED TO MIDWAY AND LANDED. MAJOR PROBLEM: THE APCH LEADING INTO MDW IS OVER NUMEROUS PRIVATE ARPTS AND ALL THE AIRSPACE IN UNCTLED!

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.