Narrative:

After receipt of digital ATIS over ACARS, I inadvertently misread the altimeter settings as 29.97 versus 29.27 (actual). I set 29.97 passing through FL180. There was a relatively high workload during this period, which resulted in a delayed 'approach descent checklist.' we leveled off at our assigned altitude of 11000 ft, based on my erroneous altimeter setting. The discrepancy was noticed as we simultaneously completed the checklist and observed the difference between my altimeter reading and that of the first officer's altimeter. I immediately reset my altimeter and initiated corrective action.

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Original NASA ASRS Text

Title: CAPT OF A B757-500 OVERSHOT INTERMEDIATE ALT ON DSCNT DUE TO FORGETTING TO RESET HIS ALTIMETER DSNDING BELOW FL180. HE NOTICED HIS MISTAKE WHEN COMPARING HIS ALTIMETER INDICATION TO THAT OF THE FO'S SINCE THE FO HAD RESET HIS.

Narrative: AFTER RECEIPT OF DIGITAL ATIS OVER ACARS, I INADVERTENTLY MISREAD THE ALTIMETER SETTINGS AS 29.97 VERSUS 29.27 (ACTUAL). I SET 29.97 PASSING THROUGH FL180. THERE WAS A RELATIVELY HIGH WORKLOAD DURING THIS PERIOD, WHICH RESULTED IN A DELAYED 'APCH DSCNT CHKLIST.' WE LEVELED OFF AT OUR ASSIGNED ALT OF 11000 FT, BASED ON MY ERRONEOUS ALTIMETER SETTING. THE DISCREPANCY WAS NOTICED AS WE SIMULTANEOUSLY COMPLETED THE CHKLIST AND OBSERVED THE DIFFERENCE BTWN MY ALTIMETER READING AND THAT OF THE FO'S ALTIMETER. I IMMEDIATELY RESET MY ALTIMETER AND INITIATED CORRECTIVE ACTION.

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.