GA SMA ENTERED ASH ATA AND LANDED WITHOUT CALLING TWR. TWR ACTIVATED LAST AUGUST AND ADVERTISED IN ARPT FAC DIRECTORY LONG BEFORE THIS FLT.

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11/88; I CALLED AND RECEIVED A BRIEFING BEFORE FLYING TO SANFORD; ME. ON THE WAY TO SANFORD I DECIDED TO STOP AT NASHUA; NH; ARPT FOR FUEL FOR THE RETURN TRIP; AS I HAVE BEEN THERE NUMEROUS TIMES IN THE PAST. UNKNOWINGLY TO ME; THE TWR HAD BEEN ACTIVATED SOME TIME IN AUG. I HAD CHKED MY CHART AND MY FLT GUIDE AND THEY LISTED A 122.7 UNICOM FREQ. I WENT TO UNICOM AND RPTED MY POS AND PROCEEDED TO LAND. UPON LNDG I WAS CONTACTED BY THE TWR AND TOLD TO RPT TO THEM. THE TWR INFORMED ME THAT THEY HAD BEEN IN OPERATION FOR SOME TIME. I HAD NO WAY OF KNOWING THAT THE TWR WAS NOW IN OPERATION BECAUSE I DIDN'T RECEIVE ANY INFO ABOUT NASHUA; NH; FROM SVC. MY NY SECTIONAL SHOWS NO FREQS AND THE BOS TCA CHART SHOWS 122.7. I CAN'T UNDERSTAND WHY NASHUA COULDN'T MONITOR 122.7 TO INFORM PLTS IN TRANSIT THAT THEY HAVE A NEW FREQ FOR TWR OPERATION. AREA PLTS SHOULD BE NOTIFIED BY MAIL OF IMPORTANT CHANGES AS THEY HAPPEN. A NUMBER OF OTHER LCL PLTS SAID THEY HAD RECEIVED NOTICES IN THE MAIL. I NEVER RECEIVED ANYTHING ABOUT NASHUA OPENING A TWR.