A C550 CITATION II IS RESTR TO TOO HIGH A SPD FOR APCH BUT FAILS TO ADVISE APCH CTLR. FO SLOWS ACFT WHEN HE THINKS THAT THE APCH CLRNC HAD BEEN RECEIVED. PIC DID NOT ADVISE ATC.

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HAD CROSSED OVER PDK AND INTERCEPTED THE 244 DEG RADIAL OUTBOUND AT 4000 FT. THIS IS THE RADIAL FOR THE VOR 26 APCH INTO FTY. THE NORMAL ALT FOR THE APCH IS 3000 FT. BEFORE XING PDK WE HAD BEEN INSTRUCTED TO MAINTAIN 180 KIAS. THE FO WAS FLYING THIS APCH AND AS WE CROSSED PDK WE CHANGED CTLRS. I CHKED IN -- THERE WERE A LOT OF XMISSIONS BTWN ATL AND OTHER ACFT. THE FO THOUGHT WE HAD BEEN CLRED FOR THE APCH AND HAD STARTED SLOWING THE ACFT DOWN AS THE 244 DEG RADIAL IS THE RADIAL FOR THE VOR APCH. WHEN THE FO STARTED SLOWING DOWN; I CALLED APCH TO SEE IF WE HAD BEEN CLRED FOR THE APCH. HE SAID NO; AND ASKED WHAT WAS OUR AIRSPD. I TOLD HIM 150 KIAS. HE ASKED WERE WE NOT GIVEN A MINIMUM OF 180 KIAS. I TOLD HIM WE HAD TO SLOW DOWN AS WE WERE 10 DME TO FTY OR WE WOULD HAVE TO GO MISSED APCH. HE SAID WE SHOULD HAVE TOLD HIM AND THEN HE CLRED US FOR THE APCH AND HANDED US OVER TO THE FTY TWR. I AGREE WITH THE CTLR. WE SHOULD HAVE TOLD HIM WE NEEDED A SLOWER AIRSPD TO MAKE THE APCH. I WILL ENSURE THAT WE TELL THE CTLR THE NEXT TIME THIS SIT ARISES AND TO BE MORE ALERT TO THE FO'S ACTIONS.