Near midair collision during a corporate mdt departure out of mdw.

Attributes
ACN	346269
Time
Date	199609
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : mdw
State Reference	IL
Altitude	msl bound lower : 4000 msl bound upper : 4600
Environment
Flight Conditions	Marginal
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : ord
Operator	general aviation : corporate
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Navigation In Use	Other Other
Flight Phase	climbout : intermediate altitude
Route In Use	departure other departure sid : sid enroute : on vectors
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	other : unknown
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : first officer
Qualification	pilot : cfi pilot : atp
Experience	flight time last 90 days : 100 flight time total : 4600 flight time type : 150
ASRS Report	346269
Person 2
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : nmac non adherence : clearance other anomaly other
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance other
Consequence	Other
Miss Distance	horizontal : 150 vertical : 500
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

We were on a center assigned heading of 090 degrees following the mdw 4 departure. We leveled off at 3000 ft. Approximately 5 mi from mdw we heard center clear someone to descend to 2000 ft. At that time we got a TA of traffic at our altitude. Center then cleared us to 5000 ft. We immediately pulled up and climbed up to 4600 ft MSL when center told us to descend to 4000 ft and maintain 040 degree on the heading. We saw the traffic and estimated a clearance of 500 ft vertical separation.

Original NASA ASRS Text

Title: NMAC DURING A CORPORATE MDT DEP OUT OF MDW.

Narrative: WE WERE ON A CTR ASSIGNED HDG OF 090 DEGS FOLLOWING THE MDW 4 DEP. WE LEVELED OFF AT 3000 FT. APPROX 5 MI FROM MDW WE HEARD CTR CLR SOMEONE TO DSND TO 2000 FT. AT THAT TIME WE GOT A TA OF TFC AT OUR ALT. CTR THEN CLRED US TO 5000 FT. WE IMMEDIATELY PULLED UP AND CLBED UP TO 4600 FT MSL WHEN CTR TOLD US TO DSND TO 4000 FT AND MAINTAIN 040 DEG ON THE HDG. WE SAW THE TFC AND ESTIMATED A CLRNC OF 500 FT VERT SEPARATION.

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.