An small aircraft wandered into the mdw arsa without clearance causing less than standard separation...

Attributes
ACN	251817
Time
Date	199309
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : mdw
State Reference	IL
Altitude	msl bound lower : 2500 msl bound upper : 2500
Environment
Flight Conditions	Marginal
Light	Daylight
Aircraft 1
Controlling Facilities	tower : mdw
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent : approach
Flight Plan	IFR
Aircraft 2
Make Model Name	Small Aircraft, High Wing, 1 Eng, Fixed Gear
Flight Phase	descent : approach
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : cfi pilot : commercial
Experience	flight time last 90 days : 140 flight time total : 9600 flight time type : 2200
ASRS Report	251817
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation non adherence : far non adherence : clearance other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other controllera other flight crewa
Resolutory Action	flight crew : took evasive action other
Consequence	Other
Miss Distance	horizontal : 1000 vertical : 0
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

We were cleared for the ILS 31C, circle to runway 22L. We called the midway ATCT at runts and started a circling maneuver east of midway airport, northbound at 2500 ft with the airport barely in sight. Visibility was lower to the east over downtown chicago. I heard an small aircraft on the frequency request a clearance into the arsa on tower frequency (118.7). He was told to remain clear of the class C airspace and asked what his position was. He replied that he was about 4 mi east. The controller then said 'I told you to remain clear of the class C airspace' and he gave him a squawk code. I began searching for the traffic. At the same instant, tower issued a possible TA to us. The TCASII issued a 'climb now, climb' RA and I got the small aircraft in sight just off our right front (about 1 O'clock) sbound. We were by now in a left turn to final and the small aircraft passed just off our right wing, opposite direction. This was very close.

Original NASA ASRS Text

Title: AN SMA WANDERED INTO THE MDW ARSA WITHOUT CLRNC CAUSING LTSS.

Narrative: WE WERE CLRED FOR THE ILS 31C, CIRCLE TO RWY 22L. WE CALLED THE MIDWAY ATCT AT RUNTS AND STARTED A CIRCLING MANEUVER E OF MIDWAY ARPT, NBOUND AT 2500 FT WITH THE ARPT BARELY IN SIGHT. VISIBILITY WAS LOWER TO THE E OVER DOWNTOWN CHICAGO. I HEARD AN SMA ON THE FREQ REQUEST A CLRNC INTO THE ARSA ON TWR FREQ (118.7). HE WAS TOLD TO REMAIN CLR OF THE CLASS C AIRSPACE AND ASKED WHAT HIS POS WAS. HE REPLIED THAT HE WAS ABOUT 4 MI E. THE CTLR THEN SAID 'I TOLD YOU TO REMAIN CLR OF THE CLASS C AIRSPACE' AND HE GAVE HIM A SQUAWK CODE. I BEGAN SEARCHING FOR THE TFC. AT THE SAME INSTANT, TWR ISSUED A POSSIBLE TA TO US. THE TCASII ISSUED A 'CLB NOW, CLB' RA AND I GOT THE SMA IN SIGHT JUST OFF OUR R FRONT (ABOUT 1 O'CLOCK) SBOUND. WE WERE BY NOW IN A L TURN TO FINAL AND THE SMA PASSED JUST OFF OUR R WING, OPPOSITE DIRECTION. THIS WAS VERY CLOSE.

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.