FO OF ACR LGT ADVANCED COCKPIT PUT THE WRONG DEST INTO ACARS WHEN REQUESTING DEP CLRNC. ACARS GAVE BACK AN INCORRECT CLRNC AND TRANSPONDER CODE THAT WAS NOT CHKED BY THE FLC. ERROR WAS DETECTED AFTER TKOF WHEN CTLR REQUESTED A MODE C CHANGE.

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I WAS THE FO ON FLT FROM BWI TO ORD. INADVERTENTLY; I ENTERED BWI AS THE DEP AND ARR STATION IN ACARS. THE FLT NUMBER AND THE OTHER INFO WERE ENTERED CORRECTLY. THE DEP CLRNC THAT WE RECEIVED WAS IN ERROR AS A RESULT. THE CLRNC WE RECEIVED WAS FOR A FLT FROM DFW TO BWI THAT OPERATED THE NIGHT BEFORE. I NEGLECTED TO CHK THE ENTIRE CLRNC; BUT ONLY SET THE DEP FREQ; THE INITIAL ALT; AND THE TRANSPONDER CODE. I HAD FLOWN THIS SAME SEQUENCE THE ENTIRE MONTH BEFORE WITH THE SAME CAPT AND I WAS COMPLACENT. AFTER TKOF WE TRIED TO CALL DEP AND AFTER GETTING NO REPLY; WE RETURNED TO TWR AND RECEIVED THE CORRECT FREQ. WE INFORMED DEP CTL THAT WE WERE CLBING TO 10000 FT; THE INITIAL ALT ON THE ERRONEOUS CLRNC. DEP CLRED US TO 17000 FT AND DID NOT QUESTION OUR ORIGINAL ALT. I DO NOT BELIEVE THERE WAS A CONFLICT WITH OTHER TFC. LATER; WASHINGTON CENTER HAD US CHANGE OUR TRANSPONDER CODE; WHICH LED US TO CHK OUR ORIGINAL CLRNC AND DETECT THE ERROR. AFTER ENTERING THE CORRECT DEST; WE RECEIVED A VALID CLRNC THROUGH ACARS. I HAD NEVER ENCOUNTERED A PROBLEM LIKE THIS BEFORE AND WAS VERY SURPRISED TO FIND THAT IT WAS POSSIBLE TO GET A CLRNC FOR A DIFFERENT FLT NUMBER; FROM A DIFFERENT DEP STATION THAT HAD PREVIOUSLY DEPARTED. COMPLACENCY WAS THE BIGGEST PROBLEM IN THIS INSTANCE. A CONTRIBUTING FACTOR WAS THE POSSIBILITY OF GETTING AN ERRONEOUS CLRNC WITH NO DOUBLE CHKS ON THE SYS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO. THE FLC DOES BRING A FLT PLAN TO THE ACFT FROM THE OPS OFFICE BUT THEY DID NOT COMPARE THE 2. RPTR SAYS SOME STATIONS REQUEST A READBACK OF THE TRANSPONDER CODE WHEN TKOF CLRNC IS REQUESTED BUT THAT BWI DOES NOT REQUEST A READBACK OF ANY FLT PLAN INFO. RPTR HAS TALKED WITH OTHER FLCS ABOUT THIS PROBLEM BUT NON HAVE EVER EXPERIENCED THIS AND HE NOW THINKS IT WAS PERHAPS JUST A 1 TIME COMPUTER GLITCH.