An EMB120 captain reads back the wrong altitude to ord departure controller.

Attributes
ACN	430250
Time
Date	199903
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : c90.tracon
State Reference	IL
Altitude	msl bound lower : 11000 msl bound upper : 13000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : c90.tracon
Operator	common carrier : air carrier
Make Model Name	Brasilia EMB-120 All Series
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude
Route In Use	departure : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument pilot : multi engine
Experience	flight time last 90 days : 240 flight time total : 2050 flight time type : 700
ASRS Report	430250
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	non adherence other other anomaly other
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance
Supplementary
Problem Areas	ATC Human Performance Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Ord departure cleared us to 13000 ft. 13000 ft was read back to controller. On the next transmission, controller said we were cleared to 11000 ft. We read back 13000 ft with no changes in altitude.

Original NASA ASRS Text

Title: AN EMB120 CAPT READS BACK THE WRONG ALT TO ORD DEP CTLR.

Narrative: ORD DEP CLRED US TO 13000 FT. 13000 FT WAS READ BACK TO CTLR. ON THE NEXT XMISSION, CTLR SAID WE WERE CLRED TO 11000 FT. WE READ BACK 13000 FT WITH NO CHANGES IN ALT.

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.