AN MD80 ACFT HAS A SPD DEV DURING DSCNT INTO TPA. PF DOES NOT PLAN FOR SPD DECREASE WHICH CAUSES HIS SPD TO REMAIN HIGH.

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LOCATION: TABIR INTXN; PIE 330 DEG RADIAL; 35 DME. WE WERE CLRED BY ATC TO CROSS TABIR INTXN AT 13000 FT AND 250 KIAS. AS WE WERE APCHING THE INTXN; IT BECAME OBVIOUS THAT WE WOULD MAKE THE ALT BUT THAT THE CAPT WAS NOT ACTING TO SLOW THE ACFT TO MEET THE SPD RESTR. I MENTIONED THE RESTR AND HE REMARKED; OH; THAT'S RIGHT; 250 KTS -- HE HAVING FORGOTTEN ABOUT THE SPD RESTR. WE BEGAN SLOWING TO 250 KIAS; BUT CROSSED TABIR AT 13000 FT AND STILL INDICATING 290 KTS; THOUGH SLOWING TO 250 KIAS. THIS WAS CAUSED BY THE CAPT SIMPLY FORGETTING THE SPD RESTR AND BY MYSELF MISTAKENLY ASSUMING AT THE TIME THAT; ALTHOUGH HE WAS WAITING LONGER THAN WHAT I WOULD WAIT TO COMMENCE THE SPD REDUCTION; THE CAPT WAS NONETHELESS AWARE OF THE RESTR AND WOULD ACT IN A TIMELY MANNER AND STILL MEET IT. THIS COULD HAVE BEEN PREVENTED HAD THE CAPT REMEMBERED THE SPD PORTION OF THE RESTR; AND HAD I REMINDED HIM OF THE RESTR WHEN I FIRST FELT IT APPROPRIATE TO BEGIN SLOWING; RATHER THAN ASSUME HE WOULD BEGIN SLOWING LATER AND STILL MEET THE SPD AS WELL AS ALT PART OF THE XING RESTR.