Narrative:

Cleared to descend to 15000 ft, busted down to 13800 ft before correcting.

Google
 

Original NASA ASRS Text

Title: FLC OF A BEECH 1900 OVERSHOT DSCNT. THEY SUBSEQUENTLY CORRECTED BACK TO THEIR ASSIGNED ALT.

Narrative: CLRED TO DSND TO 15000 FT, BUSTED DOWN TO 13800 FT BEFORE CORRECTING.

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.