A320 had track deviation in C90 class east.

Attributes
ACN	482920
Time
Date	200008
Day	Tue
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : mdw.airport
State Reference	IL
Altitude	msl single value : 15000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : c90.tracon
Operator	common carrier : air carrier
Make Model Name	A320
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 240 flight time type : 260
ASRS Report	482920
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : flight engineer pilot : cfi
Experience	flight time last 90 days : 240 flight time total : 7000 flight time type : 350
ASRS Report	482798
Events
Anomaly	non adherence : published procedure non adherence : clearance other anomaly other other spatial deviation
Independent Detector	other controllera
Resolutory Action	controller : issued alert flight crew : returned to original clearance none taken : detected after the fact
Supplementary
Problem Areas	Aircraft Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

We were level at 15000 ft after climb out of mdw, il. Controller requested a 020 degree heading, we were on a 340 degree heading. The first officer dialed in 020 degrees on the FMS mcu. After about 20 seconds I noticed the aircraft in a left turn, the wrong way to 020 degrees. I told the copilot to disconnect the autoplt and immediately turn right to 020 degrees. ATC controller said we were 'close' to another aircraft. Flight continued normally to msp.

Original NASA ASRS Text

Title: A320 HAD TRACK DEV IN C90 CLASS E.

Narrative: WE WERE LEVEL AT 15000 FT AFTER CLBOUT OF MDW, IL. CTLR REQUESTED A 020 DEG HDG, WE WERE ON A 340 DEG HDG. THE FO DIALED IN 020 DEGS ON THE FMS MCU. AFTER ABOUT 20 SECONDS I NOTICED THE ACFT IN A L TURN, THE WRONG WAY TO 020 DEGS. I TOLD THE COPLT TO DISCONNECT THE AUTOPLT AND IMMEDIATELY TURN R TO 020 DEGS. ATC CTLR SAID WE WERE 'CLOSE' TO ANOTHER ACFT. FLT CONTINUED NORMALLY TO MSP.

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.