Narrative:

At approximately XA00 local, flight was descending to cross druzz on the bucko 4 arrival at 15000 ft. Captain flying. Captain heard call to cross armel at 11000 ft, 250 KTS. Captain acknowledged call but copilot did not hear call so we verified our clearance and we were told that we had accepted someone else's clearance. Stopped descent and climbed back to 15000 ft. Believe we were 400 ft low at lowest point. No conflict.

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Original NASA ASRS Text

Title: ALTDEV ON DSCNT. FLC ANSWERED CLRNC FOR ANOTHER ACFT. WHEN RECONFIRMING WITH ATC, THEY CLBED BACK TO ASSIGNED ALT.

Narrative: AT APPROX XA00 LCL, FLT WAS DSNDING TO CROSS DRUZZ ON THE BUCKO 4 ARR AT 15000 FT. CAPT FLYING. CAPT HEARD CALL TO CROSS ARMEL AT 11000 FT, 250 KTS. CAPT ACKNOWLEDGED CALL BUT COPLT DID NOT HEAR CALL SO WE VERIFIED OUR CLRNC AND WE WERE TOLD THAT WE HAD ACCEPTED SOMEONE ELSE'S CLRNC. STOPPED DSCNT AND CLBED BACK TO 15000 FT. BELIEVE WE WERE 400 FT LOW AT LOWEST POINT. NO CONFLICT.

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.