Flight crew of air carrier large transport descends to 9000' before ZAU controller told them they were only cleared to 10000'. Controller had issued clearance to 10000', along with an advisory for traffic at 8000'. Flight crew thought they were cleared to 8000'.

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Attributes
ACN	145818
Time
Date	199005
Day	Mon
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : cgt
State Reference	IL
Altitude	msl bound lower : 4000 msl bound upper : 10000
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zau
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	cruise other descent other
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : second officer
Qualification	pilot : cfi pilot : instrument pilot : commercial pilot : flight engineer
Experience	flight time last 90 days : 200 flight time total : 1350 flight time type : 350
ASRS Report	145818
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 20000 flight time type : 8000
ASRS Report	145729
Events
Anomaly	altitude deviation : overshoot non adherence : clearance
Independent Detector	other controllera
Resolutory Action	flight crew : returned to intended course or assigned course
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Cleared from 11000 to 10000'. Center said traffic at 8000'. Misunderstood and set altitude alert for 8000' and started for it. At 9000' center called and said only cleared for 10000'. Immediately climbed to 10000'.

Original NASA ASRS Text

Title: FLT CREW OF ACR LGT DESCENDS TO 9000' BEFORE ZAU CTLR TOLD THEM THEY WERE ONLY CLEARED TO 10000'. CTLR HAD ISSUED CLRNC TO 10000', ALONG WITH AN ADVISORY FOR TRAFFIC AT 8000'. FLT CREW THOUGHT THEY WERE CLRED TO 8000'.

Narrative: CLRED FROM 11000 TO 10000'. CENTER SAID TFC AT 8000'. MISUNDERSTOOD AND SET ALT ALERT FOR 8000' AND STARTED FOR IT. AT 9000' CENTER CALLED AND SAID ONLY CLRED FOR 10000'. IMMEDIATELY CLBED TO 10000'.

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.