Narrative:

Late at night, not much traffic, we were given a descent to cross 30 DME southwest of albany at 11000 ft I heard 10000 ft. Aircraft was descending past 11000 ft at 1000 FPM. The captain asked if (or to verify 11000 ft) I said to check with ATC who responded 11000 ft. I was in the process of stopping the descent with the autoplt which (started at 11000 minus 200 ft). The altitude dipped to 11000 minus 380 ft to 400 ft before climb back to 11000 ft. Next time stop descent immediately, discontinue autoplt and hand fly (stop descent) listen for other pilot 1000 ft above call and suspect no response. I had set altitude alerter to 10000 ft so no back up except other pilot 1000 ft above which I did not hear. Late at night, long days of flying. Need to be more alert, when tired.

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Original NASA ASRS Text

Title: ALT OVERSHOT DURING DSCNT.

Narrative: LATE AT NIGHT, NOT MUCH TFC, WE WERE GIVEN A DSCNT TO CROSS 30 DME SW OF ALBANY AT 11000 FT I HEARD 10000 FT. ACFT WAS DSNDING PAST 11000 FT AT 1000 FPM. THE CAPT ASKED IF (OR TO VERIFY 11000 FT) I SAID TO CHK WITH ATC WHO RESPONDED 11000 FT. I WAS IN THE PROCESS OF STOPPING THE DSCNT WITH THE AUTOPLT WHICH (STARTED AT 11000 MINUS 200 FT). THE ALT DIPPED TO 11000 MINUS 380 FT TO 400 FT BEFORE CLB BACK TO 11000 FT. NEXT TIME STOP DSCNT IMMEDIATELY, DISCONTINUE AUTOPLT AND HAND FLY (STOP DSCNT) LISTEN FOR OTHER PLT 1000 FT ABOVE CALL AND SUSPECT NO RESPONSE. I HAD SET ALT ALERTER TO 10000 FT SO NO BACK UP EXCEPT OTHER PLT 1000 FT ABOVE WHICH I DID NOT HEAR. LATE AT NIGHT, LONG DAYS OF FLYING. NEED TO BE MORE ALERT, WHEN TIRED.

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.