ACR BUSTED SPEED RESTRICTION ABOVE 10000' WHICH HAD BEEN GIVEN MUCH EARLIER ON CLRNC DELIVERY FREQ. SEE ALSO ACN 91721.

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CAPT FLYING ACFT: CLRNC RECEIVED AT GATE INCLUDED AIRSPD RESTRICTION OF 250 KTS. AT 10000' MSL ALLOWED ACFT TO ACCELERATE TO NORMAL CLB SPD. AT APPROX 16000'; CTR ADVISED TO RESUME NORMAL SPD; BUT NEVER COMMENTED ABOUT THE SPD WE WERE ACTUALLY FLYING. ENTIRE CREW HAD FORGOTTEN ABOUT SPD RESTRICTION. RECOMMENDATION: WHILE IT IS IMPORTANT TO RECEIVE ANY KNOWN RESTRICTIONS WITH THE CLRNC; AN ITEM WHICH IS A DEP FROM THE 'NORM' SHOULD BE REITERATED BY EITHER TWR JUST PRIOR TO TKOF OR BY DEPT CTL. THIS MAY BE A NORMAL PROC OUT OF RDU BUT IT WAS MY FIRST FLT OUT OF THAT ARPT AND MORE THAN 45 MINUTES HAD ELAPSED FROM RECEIPT OF THE CLRNC UNTIL THE ACFT REACHED 10000' MSL. CALLBACK CONVERSATION WITH RPTR REVEALED FOLLOWING. TALKED ABOUT TWO RPTS FROM SAME RPTR. VERY SIMILAR INCIDENT ABOUT FOUR HOURS APART ON SAME DAY INVOLVING SAME ATC FACS. SAYS THAT FLT CREWS BASED AT RDU OR WHO FLY THERE REGULARLY MAY NOT HAVE A PROB REMEMBERING SPD RESTRICTION ABOVE 10000'; BUT OTHER FLT CREWS MAY NOT BE ACCUSTOMED TO THAT TYPE CLRNC; AND DUE TO LONG TIME PERIOD FROM TIME OF RECEIVING IFR CLRNC ON GND TO REACHING 10000 THE RESTRICTION MAY BE FORGOTTEN. IF RESTRICTION IS STILL NEEDED BY ATC IT SHOULD BE RESTATED AT APPROPRIATE TIME.