INSTRUCTOR PLT LANDS AT SBY WITHOUT CLRNC.

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MY STUDENT AND I PREPARED TO DEPART ON AN IFR XCOUNTRY; IN VFR WX. I ASKED THE STUDENT TO CHK WX; NOTAMS; FILE AN IFR FLT PLAN AND PREFLT. AFTER A SHORT TIME; MY STUDENT ADVISED ME THAT EVERYTHING WAS DONE EXCEPT THE FLT PLAN WAS NOT FILED. I ASKED ATLANTIC CITY TO ACTIVATE OUR IFR FLT PLAN. I WAS TOLD THEY DIDN'T HAVE IT. SO I ADVISED THEM THAT I COULD CONTINUE VFR WITH ADVISORIES. WHEN I SWITCHED TO DOVER THEY ASKED ME TO CONFIRM MY DEST WHICH I DID. ABOUT 10 MI N OF SBY I WAS ADVISED; THE ARPT IS AT 12 O'CLOCK POS 10 MI; RADAR SVCS TERMINATED; SQUAWK VFR; FREQ CHANGE APPROVED. FOR FURTHER ADVISORIES CONTACT PXT APCH. SINCE I HAD THE FIELD IN SIGHT I DID NOT CONTACT PXT. I SWITCHED TO THE CTAF AND MADE POS RPTS. WE FLEW OVER THE FIELD LOOKED AT THE WINDSOCK AND SET UP FOR A L DOWNWIND. WHEN WE LANDED AND TAXIED OFF; I NOTICED A CTL TWR. I QUICKLY LOOKED AT MY CHARTS TO CONFIRM THAT THEY DIDN'T SHOW A CTL TWR. AT THAT POINT; I FIGURED THE TWR WAS DECOMMISSIONED. WHEN I TAXIED BY; I NOTICED SOMEONE IN THE TWR WAVING. I LOOKED AT THE CHARTS AGAIN AND CALLED PXT APCH. I STARTED TO ASK PXT IF THEY HAD A FREQ FOR SBY TWR; AS I WAS DOING THIS; TWR CAME ON PXT'S FREQ AND SAID; ACFT ON THE GND AT SBY CONTACT SBY TWR ON FREQ XXX.XX. I IMMEDIATELY CALLED TWR AND ADVISED THEM THAT MY CURRENT CHARTS HAD NO FREQ FOR SBY TWR. TWR ADVISED ME THAT THEY WERE OPEN BY NOTAM. AT THIS POINT; I APOLOGIZED PROFUSELY AND WAS TOLD BY TWR TO BE SURE AND CONTACT HIM BEFORE I DEPARTED; WHICH I DID. IF I HAD GOTTEN THE IFR I WOULD HAVE BEEN TOLD TO CONTACT TWR. SINCE I WAS VFR; AND THE TWR WAS NEW; DOVER MIGHT HAVE ADVISED ME TO CONTACT THE TWR AND NOT PXT APCH. ALSO TWR COULD MONITOR THE CTAF.