Narrative:

I advised the captain that we had 1000 ft to go at 9000 ft. At that time I looked down to adjust the heat of the aircraft, after doing so I looked up and saw we were at 12000 ft. The captain saw the altitude at the same time. We started our descent back to 10000 ft and at that time ZMP called us to ask us our altitude. We reported to them 10000 ft (actual 11800 ft). That was the last conversation about it. (Corrective action) -- maintain visual scan.

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Original NASA ASRS Text

Title: ALTDEV ALT OVERSHOT IN CLB.

Narrative: I ADVISED THE CAPT THAT WE HAD 1000 FT TO GO AT 9000 FT. AT THAT TIME I LOOKED DOWN TO ADJUST THE HEAT OF THE ACFT, AFTER DOING SO I LOOKED UP AND SAW WE WERE AT 12000 FT. THE CAPT SAW THE ALT AT THE SAME TIME. WE STARTED OUR DSCNT BACK TO 10000 FT AND AT THAT TIME ZMP CALLED US TO ASK US OUR ALT. WE RPTED TO THEM 10000 FT (ACTUAL 11800 FT). THAT WAS THE LAST CONVERSATION ABOUT IT. (CORRECTIVE ACTION) -- MAINTAIN VISUAL SCAN.

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.