MD90 aircraft was cleared to descend to 12000 ft but flight crew thought clearance was to 11000 ft. Controller intervened when aircraft was at 11000 ft and flight crew returned to assigned 12000 ft.

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Attributes
ACN	371840
Time
Date	199706
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : slc
State Reference	UT
Altitude	msl bound lower : 11000 msl bound upper : 12000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : slc tower : vis
Operator	common carrier : air carrier
Make Model Name	MD-88
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	cruise other descent other
Route In Use	enroute airway : slc
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : instrument pilot : cfi pilot : commercial pilot : flight engineer
Experience	flight time last 90 days : 210 flight time total : 14600 flight time type : 4500
ASRS Report	371840
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	altitude deviation : overshoot non adherence : clearance other anomaly other
Independent Detector	other controllera
Resolutory Action	flight crew : returned to intended course or assigned course other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Thought we were cleared to 11000 ft. Controller reminded us we were only cleared to 12000 ft. No problems, no conflict. We returned to 12000 ft. (We thought we had read back 11000 ft.)

Original NASA ASRS Text

Title: MD90 ACFT WAS CLRED TO DSND TO 12000 FT BUT FLC THOUGHT CLRNC WAS TO 11000 FT. CTLR INTERVENED WHEN ACFT WAS AT 11000 FT AND FLC RETURNED TO ASSIGNED 12000 FT.

Narrative: THOUGHT WE WERE CLRED TO 11000 FT. CTLR REMINDED US WE WERE ONLY CLRED TO 12000 FT. NO PROBS, NO CONFLICT. WE RETURNED TO 12000 FT. (WE THOUGHT WE HAD READ BACK 11000 FT.)

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.