Narrative:

I was flying a commander on an IFR flight plan from gri to oma as part of a 2 person crew. We were cruising at 13000 ft when the PNF called center and asked to start our descent. The controller cleared us to 11000 ft. We were continuing our descent when the controller said he was confused with our assigned altitude and asked us what we were cleared to. The PNF said he believed we were cleared to 10000 ft. At that time we were at 9700 ft. We immediately climbed to 10000 ft. After reaching 10000 ft, the controller cleared us down to 9000 ft and handed us off to the next controller. This incident was a result of poor communication between the crew members, and lack of attention to our assigned altitude. In the future our crew will use written callouts for altitudes and when available use an altitude bug to indicate our assigned altitude. If clarification is ever necessary we will contact the controller.

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Original NASA ASRS Text

Title: A DSNDING AERO COMMANDER ATX FLT OVERSHOT ITS ALT BY 1300 FT BEFORE ATC STOPS THEIR DSCNT.

Narrative: I WAS FLYING A COMMANDER ON AN IFR FLT PLAN FROM GRI TO OMA AS PART OF A 2 PERSON CREW. WE WERE CRUISING AT 13000 FT WHEN THE PNF CALLED CTR AND ASKED TO START OUR DSCNT. THE CTLR CLRED US TO 11000 FT. WE WERE CONTINUING OUR DSCNT WHEN THE CTLR SAID HE WAS CONFUSED WITH OUR ASSIGNED ALT AND ASKED US WHAT WE WERE CLRED TO. THE PNF SAID HE BELIEVED WE WERE CLRED TO 10000 FT. AT THAT TIME WE WERE AT 9700 FT. WE IMMEDIATELY CLBED TO 10000 FT. AFTER REACHING 10000 FT, THE CTLR CLRED US DOWN TO 9000 FT AND HANDED US OFF TO THE NEXT CTLR. THIS INCIDENT WAS A RESULT OF POOR COM BTWN THE CREW MEMBERS, AND LACK OF ATTN TO OUR ASSIGNED ALT. IN THE FUTURE OUR CREW WILL USE WRITTEN CALLOUTS FOR ALTS AND WHEN AVAILABLE USE AN ALT BUG TO INDICATE OUR ASSIGNED ALT. IF CLARIFICATION IS EVER NECESSARY WE WILL CONTACT THE CTLR.

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.