LGT RECEIVED CAF CLRNC WHEN EHE SHOULD HAVE BEEN GIVEN A FULL READOUT CLRNC. ACFT WAS OFF COURSE FROM ARTCC FLT PLAN. NEW EECP PROC.

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THE COPY OF THE COMPUTER GENERATED AND FILED AFTN FLT PLAN FOR LGT FLT 3/THU WAS PICKED UP WITH THE PRE-DEP PAPERS. IT SHOWED THE FOLLOWING ROUTE HAD BEEN FILED TO REGIONAL SW ARPT; FL: JFK-CYN-J37-GVE-J75-TAY-J85-GNV. WHEN CONTACTED JFK CLRNC DELIVERY CLRED US AS FOLLOWS: 'LGT IS CLRED TO THE RSW ARPT VIA THE JFK #1 DEP; BREEZY POINT CLB; RBV TRANSITION; AS FILED; EXPECT FL310; SQUAWK XXXX.' AFTER DEP THE SID WAS COMPLIED WITH WHILE IN CONTACT WITH JFK DEP; AND ALSO WITH NY DEP. WHILE ON THE SID DESIGNATED R OF THE CANARSIE VOR; LGT WAS CLRED DIRECT TO RBV VOR AND TO CONTACT NY CENTER. NY CENTER CLRED THE FLT TO FL310. AFTER PASSING RBV VOR THE COPLT; WHO WAS FLYING; BEGAN A TURN TOWARD CYN VOR (APPROX A 180 DEG HDG; AND 75 DEG HDG CHANGE). AT ABOUT XA05Z; PASSING THROUGH ABOUT FL205 AND 210 DEGS ON THE HDG; THE CENTER CALLED AND ASKED FOR OUR HDG. WHEN I REPLIED; THE CENTER ISSUED AN 'IMMEDIATE RIGHT TURN TO HDG 330; MAINTAIN FL220! WHERE ARE YOU GOING?!' I REPLIED THAT WE WERE GOING TO CYN VOR AS FILED. WE WERE THEN ISSUED A HDG OF 360 DEGS TO INTERCEPT THE RBV VOR 274 R; AND STAND BY TO COPY A REROUTE. THE NEW CLRNC WAS: 'CLRED TO RSW ARPT VIA J230; J75 TAY; J85 GNV; DIRECT LAL; DIRECT FMY; DIRECT RSW.' AFTER READING BACK THE NEW CLRNC; I READ THE CTLR THE ORIGINAL CLRNC AND EXPLAINED ONCE AGAIN THAT WE HAD BEEN CLRED AS FILED. HE EXPLAINED ABOUT THE EXPANDED EAST COAST PLAN AND THAT IT HAD BEEN IN EFFECT FOR A WEEK; AND THAT THE COMPANY COMPUTER HAD NOT AS YET BEGUN TO FILE THE NEW FLT PLANS. AS A RESULT WE SHOULD HAVE BEEN GIVEN A FULL READBACK CLRNC BY JFK CLRNC DELIVERY. HE QUESTIONED THE FACT THAT WE HAD NOT BEEN GIVEN A FULL READBACK. I ASSURED HIM WE HAD NOT. A SHORT TIME LATER THE CTLR CALLED AND TOLD US THAT THE ERROR HAD OCCURRED BTWN THE CENTER AND THE TWR; AND THEY HAD CONFIRMED THAT WE INDEED HAD NOT BEEN GIVEN THE REVISED ROUTING. IT HAS BEEN MY OBSERVATION THAT IT USUALLY TAKES THE COMBINATION OF AT LEAST 3 EVENTS TO BRING ABOUT A SERIOUS PROB. ON THIS FLT; 2 OF THE BOXES HAD BEEN FILLED; AND HAD THE CENTER CTLR BEEN TOO BUSY OR NOT OBSERVANT AT THE RIGHT TIME; THERE WAS CERTAINLY THE POTENTIAL FOR A VERY SERIOUS PROB.