FLC FAILS TO COMPLY WITH ASSIGNED ALT AND SPD RESTRS. AMENDED CLRNC LATE SPD ADJUSTMENT.

Narrative

FLT XXX PHX-PIT WAS APPROX OVER CTW AT FL190 WHEN ATC GAVE US DIRECT HLG AND CROSS HLG AT 10000 FT MSL. AUTOPLT WAS ON AND VNAV WAS ENGAGED WITH THE HLG 10 MI W 10000 FT RESTR IN THE FMC. APPROX 10 MI FROM THE HLG 10 MI W FIX; ATC ASKED US TO ALSO CROSS 10 MI W HLG AT 10000 FT AND 250 KTS. DURING THE DSCNT IN VNAV IT LOOKED LIKE WE MIGHT BE HIGH SO I MANUALLY INTERVENED AND INCREASED THE DSCNT RATE. WE ENDED UP XING APPROX 11000-11300 FT AND ABOUT 280 KTS. ATC THEN HANDED US OFF TO PIT APCH WHO THEN VECTORED US FOR A VISUAL TO RWY 10L. NO OTHER TFC WAS SEEN ON TCASII OR CONFLICTS NOTED BY ATC. SOME FACTORS THAT CONTRIBUTED TO US NOT MEETING THE XING RESTRS WERE ATC RECLRNC TO 250 KTS AND THE RESULTANT REQUIREMENT TO CHANGE VNAV PROFILE TO MEET 250 KTS. ALL OF THESE THINGS OCCURRED WHEN THE CREW WAS TRYING TO ACCOMPLISH THE PRELIMINARY CHKLIST; AND MAKING REQUIRED PA ANNOUNCEMENT TO THE PAX AND FLT ATTENDANTS TO PREPARE FOR ARR. THE CAPT WAS OFF ATC AT TIMES FOR THE PA LEAVING ONLY FO ON ATC TO COPY CLRNC AND REPROGRAM FMCS; ETC. WITH HINDSIGHT; WE NOW KNOW WE SHOULD HAVE NOT ACCEPTED THE RECLRNC TO 250 KTS BECAUSE IT INVOLVED TOO MANY CHANGES AT A HIGH WORKLOAD TIME WITH; AT TIMES; ONLY 1 PLT WITH FMC/RADIO DUTIES.