A B757 FLT CREW RECEIVE ERRONEOUS SWITCHING OF ACARS ATIS INFO WHEN OPERATING FROM ONE ARPT TO THE NEXT.

Narrative

THE GSO D-ATIS ONCE IT HAS BEEN SELECTED ON THE ACARS WILL CONTINUE TO 'REFRESH' ITSELF EVEN IF ANOTHER D-ATIS IS SELECTED ON THE NEXT LEG. FOR EXAMPLE; WE OPERATE ROA-GSO-SDF. AFTER LNDG IN GSO WHEN ATIS IS SELECTED ON THE ACARS; WE GET DEP ATIS FOR GSO. AFTER DEP; WE REQUEST D-ATIS FOR SDF. AFTER SDF ATIS IS RECEIVED; THE ACARS FLASHES AN 'UPDATED' ATIS. IT WILL BE GSO EVEN THOUGH WE HAVE DEPARTED GSO; ARE ENRTE TO SDF AND HAVE REQUESTED THE SDF ATIS ON THE ACARS. WE MUST NOW RE-REQUEST SDF ATIS; AND ONCE AGAIN; THE GSO ATIS WILL COME UP AFTER WE GET THE SDF ATIS. IT APPEARS THAT UNTIL WE HAVE LANDED AT ANOTHER ARPT; THE GSO ATIS KEEPS COMING BACK. THIS IS MOSTLY A NUISANCE; BUT ON THE FLT IN QUESTION; WE STARTED OUR APCH IN IMC AND BROKE OUT TO VFR CONDITIONS AT ABOUT 1200 FT AGL. DURING THE COURSE OF THE APCH IN THE TERMINAL AREA; ONE OF US (THE OPERATING CREW; I DON'T REMEMBER WHOM) NOTICED A NEW ATIS FLASHING AND THE TIME WAS CORRECT FOR A NEW ATIS TO BE COMING OUT. WE RESET OUR ALTIMETERS WHILE ON THE APCH; AND BELOW 1000 FT AGL NOTICED THAT WE SEEMED TO BE A LITTLE LOW ON THE PAPI BUT ON THE VNAV PATH. WE LANDED NORMALLY AND NOTICED THE ALTIMETERS BOTH READING 50 FT LOW RELATIVE TO FIELD ELEVATION. UPON INVESTIGATION; WE DISCOVERED WE HAD SET GSO ALTIMETER BECAUSE THE 'NEW' ATIS WAS GSO NOT SDF. IN THIS CASE NO HARM WAS DONE; BUT IN LOW IFR IT COULD PRESENT A REAL PROB. I HAVE NOTICED THIS ANOMALY FOR QUITE SOME TIME IN MANY DIFFERENT ACFT. I DO NOT KNOW IF THIS IS A PROB WITH GSO OR IF THIS IS A COMPANY ACARS PROB.