Cpr Y had less than standard separation from small aircraft X. System error.

Attributes
ACN	248656
Time
Date	199308
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : mdw
State Reference	IL
Altitude	msl bound lower : 3000 msl bound upper : 3000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : ord tower : mdw
Operator	general aviation : personal
Make Model Name	Small Aircraft, Low Wing, 1 Eng, Fixed Gear
Flight Phase	climbout : intermediate altitude
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	general aviation : corporate
Make Model Name	Light Transport, Low Wing, 2 Turboprop Eng
Flight Phase	climbout : intermediate altitude
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : departure
Qualification	controller : radar
ASRS Report	248656
Person 2
Affiliation	government : faa
Function	controller : local
Qualification	controller : non radar
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : required legal separation
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance other
Consequence	faa : investigated
Miss Distance	horizontal : 12000
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Intra Facility Coordination Failure Operational Error

Narrative:

Small aircraft X departed midway airport on 250 degree heading climbing to 3000 ft. He was talking to chicago departure control. Cpr Y departs on 250 degree heading climbing to 3000 ft. Upon initial contact with chicago departure, the aircraft were less than standard IFR separation and I immediately turned cpr Y to 290 degree heading on initial contact. I informed the area supervisor of the conflict. This is the only information I have. It appears as though the midway tower controller must have forgotten about the slower small aircraft X and released the faster departure right into him.

Original NASA ASRS Text

Title: CPR Y HAD LTSS FROM SMA X. SYS ERROR.

Narrative: SMA X DEPARTED MIDWAY ARPT ON 250 DEG HDG CLBING TO 3000 FT. HE WAS TALKING TO CHICAGO DEP CTL. CPR Y DEPARTS ON 250 DEG HDG CLBING TO 3000 FT. UPON INITIAL CONTACT WITH CHICAGO DEP, THE ACFT WERE LESS THAN STANDARD IFR SEPARATION AND I IMMEDIATELY TURNED CPR Y TO 290 DEG HDG ON INITIAL CONTACT. I INFORMED THE AREA SUPVR OF THE CONFLICT. THIS IS THE ONLY INFO I HAVE. IT APPEARS AS THOUGH THE MIDWAY TWR CTLR MUST HAVE FORGOTTEN ABOUT THE SLOWER SMA X AND RELEASED THE FASTER DEP RIGHT INTO HIM.

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.