Narrative:

Altitude deviation. The company had requested an autoland on this aircraft. We were on the jen 5 arrival to dfw, at 11000 ft. The first officer was flying the aircraft. Past the jen VOR, I was briefing the first officer on the autoland approach. I heard and read back to ATC 'air carrier abc maintain 5000 ft.' at 9000 ft, the first officer requested that I should verify the altitude. The first officer leveled off at 9000 ft. I requested that ATC verify the altitude. He informed us that the clearance had not been for us. A few seconds later, we heard an air carrier abd and an air carrier ebc on the same frequency. ATC then cleared us to 7000 ft and vectors. At no time was there any conflict with other aircraft.

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Original NASA ASRS Text

Title: MD80 CREW HAD ALTDEV AT DFW.

Narrative: ALTDEV. THE COMPANY HAD REQUESTED AN AUTOLAND ON THIS ACFT. WE WERE ON THE JEN 5 ARR TO DFW, AT 11000 FT. THE FO WAS FLYING THE ACFT. PAST THE JEN VOR, I WAS BRIEFING THE FO ON THE AUTOLAND APCH. I HEARD AND READ BACK TO ATC 'ACR ABC MAINTAIN 5000 FT.' AT 9000 FT, THE FO REQUESTED THAT I SHOULD VERIFY THE ALT. THE FO LEVELED OFF AT 9000 FT. I REQUESTED THAT ATC VERIFY THE ALT. HE INFORMED US THAT THE CLRNC HAD NOT BEEN FOR US. A FEW SECONDS LATER, WE HEARD AN ACR ABD AND AN ACR EBC ON THE SAME FREQ. ATC THEN CLRED US TO 7000 FT AND VECTORS. AT NO TIME WAS THERE ANY CONFLICT WITH OTHER ACFT.

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.