Narrative:

Cleared to FL240 on the arrival. Autoplt failed to level off at the assigned altitude; crew realized too late and we ended up about 400 ft too low before correcting. ATC didn't mention the deviation. Crew was distracted from an ACARS message and was late recognizing the autoplt problem.

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Original NASA ASRS Text

Title: AN A310 ON A DSCNT PROFILE DID NOT LEVEL AT THE FMC AND ALT ALERT SET ALT.

Narrative: CLRED TO FL240 ON THE ARR. AUTOPLT FAILED TO LEVEL OFF AT THE ASSIGNED ALT; CREW REALIZED TOO LATE AND WE ENDED UP ABOUT 400 FT TOO LOW BEFORE CORRECTING. ATC DIDN'T MENTION THE DEV. CREW WAS DISTRACTED FROM AN ACARS MESSAGE AND WAS LATE RECOGNIZING THE AUTOPLT PROB.

Data retrieved from NASA's ASRS site as of January 2009 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.