Aircraft responded to descent clearance with a full readback. As aircraft leveled off, ARTCC told the flight crew they had descended to the wrong altitude.

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Attributes
ACN	431950
Time
Date	199903
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	navaid : gpt.vortac
State Reference	MS
Altitude	msl single value : 10000
Environment
Flight Conditions	VMC
Aircraft 1
Controlling Facilities	artcc : zhu.artcc
Operator	common carrier : air carrier
Make Model Name	DC-9 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	cruise : enroute altitude change
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : multi engine pilot : instrument pilot : commercial pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 200 flight time total : 19400 flight time type : 6500
ASRS Report	431950
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : commercial pilot : instrument
Events
Anomaly	altitude deviation : overshoot altitude deviation : excursion from assigned altitude non adherence : clearance
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance none taken : detected after the fact
Supplementary
Problem Areas	Flight Crew Human Performance ATC Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

ZHU cleared us to descend to 10000 ft, first officer read back 10000 ft. After leveloff at 10000 ft, center asked us what our altitude was and first officer replied 10000 ft. Center said we were cleared to 11000 ft. First officer replied, 'I read back 10000 ft.' center said, 'remain at 10000 ft and contact gpt approach control.' the center was busy at the time directing other aircraft. Either one of us missed a readback or we were given the wrong altitude initially.

Original NASA ASRS Text

Title: ACFT RESPONDED TO DSCNT CLRNC WITH A FULL READBACK. AS ACFT LEVELED OFF, ARTCC TOLD THE FLC THEY HAD DSNDED TO THE WRONG ALT.

Narrative: ZHU CLRED US TO DSND TO 10000 FT, FO READ BACK 10000 FT. AFTER LEVELOFF AT 10000 FT, CTR ASKED US WHAT OUR ALT WAS AND FO REPLIED 10000 FT. CTR SAID WE WERE CLRED TO 11000 FT. FO REPLIED, 'I READ BACK 10000 FT.' CTR SAID, 'REMAIN AT 10000 FT AND CONTACT GPT APCH CTL.' THE CTR WAS BUSY AT THE TIME DIRECTING OTHER ACFT. EITHER ONE OF US MISSED A READBACK OR WE WERE GIVEN THE WRONG ALT INITIALLY.

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.