FLC FAILS TO MAKE XING RESTR.

Narrative

OVER MORGANTOWN VOR ON WESTMINSTER 3 ARR TO BWI I WAS GIVEN A CLRNC TO 'CROSS L1210 AT 25000 FT AND MUMSY AT 15000 FT.' I READ BACK 'CROSS L1210 AT 25000 FT AND MUMSY AT 11000 FT.' THE CTLR RESTATED CLRNC TO CROSS MUMSY AT 15000 FT. THE CORRECTED CLRNC WAS MISINTERPRETED BY ME AS A NEW CLRNC CANCELING THE L1210 RESTR. I RPTED LEAVING 27000 FT AND CROSSED L1210 AT ABOUT 24000 FT. THE CTLR POINTED OUT THE ERROR; THERE WAS NO APPARENT TFC CONFLICT. THE DSCNT WAS STARTED EARLIER THAN NORMAL FOR MUMSY FOR SEVERAL REASONS; AN UNUSUALLY STRONG TAILWIND GAVE A GROUND SPD OF ALMOST 600 KTS AND THE PRECEDING ACFT WAS GIVEN A SPD RESTR IN THE DSCNT SO I ANTICIPATED THE SAME. ALSO ICING CONDITIONS WERE ANTICIPATED PRIOR TO MUMSY WHICH REQUIRES PWR WELL ABOVE IDLE THRUST IN THE MD80. ANOTHER CONTRIBUTING FACTOR WAS THAT THE FO WAS RECEIVING ATIS AND COMMUNICATING WITH COMPANY SO I WAS 'SOLO' HANDLING THIS CLRNC. EQUIP/PROCS TO PREVENT RECURRENCE: ATIS PRINTER IN COCKPIT AND A PROC FOR FLT ATTENDANTS TO COMMUNICATE REQUIRED SVCS (WHEELCHAIRS; ETC) BEFORE PUSHBACK AND FOR PLTS TO CALL THEM IN WELL BEFORE DSCNT. THIS COULD PREVENT 'SOLO' HANDLING OF RADIOS IN CRITICAL PHASE OF FLT (DSCNT).