Approach controller at C90 claims readback errors occur several times daily.

Attributes
ACN	487774
Time
Date	200010
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	navaid : ord.vor
State Reference	IL
Altitude	msl single value : 5000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : c90.tracon
Operator	common carrier : air carrier
Make Model Name	MD-80 Series (DC-9-80) Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	other vortac
Flight Phase	climbout : vacating altitude
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : departure
Qualification	controller : radar
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	non adherence : clearance
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance flight crew : returned to assigned altitude
Supplementary
Problem Areas	ATC Human Performance Flight Crew Human Performance
Primary Problem	Ambiguous
Situations
ATC Facility	procedure or policy : ord.comrdo

Narrative:

Air carrier X, ord to rdu, issued 6000 ft altitude. Read back 16000 ft. Traffic overhead at 7000 ft. Caught by controller. This is happening several times daily!

Original NASA ASRS Text

Title: APCH CTLR AT C90 CLAIMS READBACK ERRORS OCCUR SEVERAL TIMES DAILY.

Narrative: ACR X, ORD TO RDU, ISSUED 6000 FT ALT. READ BACK 16000 FT. TFC OVERHEAD AT 7000 FT. CAUGHT BY CTLR. THIS IS HAPPENING SEVERAL TIMES DAILY!

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.