Near midair collision. Reporter flight crew of this mdt aircraft was climbing out from mdw under positive ATC control when traffic conflict developed. Flight crew received TCASII alert and started climbing at the same time ATC told them to climb. Then, the controller intervened and told them to descend with a heading change.

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Attributes
ACN	346495
Time
Date	199609
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : mdw
State Reference	IL
Altitude	msl bound lower : 3000 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
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 120 flight time total : 4900 flight time type : 100
ASRS Report	346495
Person 2
Affiliation	Other
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	conflict : nmac non adherence : published procedure non adherence : far
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance other
Consequence	Other
Miss Distance	horizontal : 100 vertical : 500
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Intra Facility Coordination Failure Operational Error

Narrative:

We leveled off at 3000 ft MSL. Center assigned heading of 090 degrees. Center instructed another aircraft to descend immediately. At that point we got a TA of an aircraft within 6 mi and at same altitude. Center told us to immediately climb to 5000 ft. We were already starting a climb because of a TA that the TCASII has given us. We were doing an approximately 3000 FPM climb and had passed 4000 ft and were through 4600 ft MSL when center told us to descend to 4000 ft MSL and turn to 040 degrees on heading. We cleared the traffic going above traffic at what I estimate at 500 ft. We had just got handed over to departure, so I'm not sure what clearance the other aircraft had, but we were on the heading and altitude assigned to us by center.

Original NASA ASRS Text

Title: NMAC. RPTR FLC OF THIS MDT ACFT WAS CLBING OUT FROM MDW UNDER POSITIVE ATC CTL WHEN TFC CONFLICT DEVELOPED. FLC RECEIVED TCASII ALERT AND STARTED CLBING AT THE SAME TIME ATC TOLD THEM TO CLB. THEN, THE CTLR INTERVENED AND TOLD THEM TO DSND WITH A HDG CHANGE.

Narrative: WE LEVELED OFF AT 3000 FT MSL. CTR ASSIGNED HDG OF 090 DEGS. CTR INSTRUCTED ANOTHER ACFT TO DSND IMMEDIATELY. AT THAT POINT WE GOT A TA OF AN ACFT WITHIN 6 MI AND AT SAME ALT. CTR TOLD US TO IMMEDIATELY CLB TO 5000 FT. WE WERE ALREADY STARTING A CLB BECAUSE OF A TA THAT THE TCASII HAS GIVEN US. WE WERE DOING AN APPROX 3000 FPM CLB AND HAD PASSED 4000 FT AND WERE THROUGH 4600 FT MSL WHEN CTR TOLD US TO DSND TO 4000 FT MSL AND TURN TO 040 DEGS ON HDG. WE CLRED THE TFC GOING ABOVE TFC AT WHAT I ESTIMATE AT 500 FT. WE HAD JUST GOT HANDED OVER TO DEP, SO I'M NOT SURE WHAT CLRNC THE OTHER ACFT HAD, BUT WE WERE ON THE HDG AND ALT ASSIGNED TO US BY CTR.

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.