WHILE ON APCH; A BA-32 COMMUTER FLC ATTEMPTED TO CONTACT THE TWR ON THE WRONG FREQ. AFTER NO RESPONSE; FLC ASSUMED THAT TWR WAS CLOSED; AND CONTINUED INTO CLASS D AND LANDED WITHOUT LNDG CLRNC.

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ON MAY/MON/95 WE LEFT HPN FOR A SHORT COMBINATION FLT TO SWF. WE WERE ON AN IFR FLT PLAN AND IN NEW YORK APCH CTL'S JURISDICTION. WE WERE IN VMC CONDITIONS AT 3000 FT CRUISING TO SWF. THE FLT LASTED ALL OF ABOUT 12-15 MINS AND WE WERE ABLE TO PICK UP SWF ABOUT 12 MI OUT. AFTER CONFIRMING THE ARPT WITH APCH CTL; WE WERE CLRED FOR THE VISUAL APCH TO RWY 9 AT SWF. AT THIS TIME; THE CAPT (PNF) WAS TALKING TO COMPANY ON THE #2 RADIO. I (PF) WAS TOLD TO CONTACT SWF TWR ON 121.1. THE CAPT THEN RETURNED TO THE #1 RADIO AND I TOLD HIM WE WERE CLRED FOR VISUAL TO RWY 9. I THEN TOLD HIM TO CALL THE TWR AS I HAD NOT CHKED IN YET. HE PROCEEDED TO CALL 3 TIMES WITH NO RESPONSE. AT THIS TIME; WE WERE CONFIGURING THE ACFT AND ON BASE LEG FOR THE RWY. THE CAPT THEN ASSUMED THAT THE TWR WAS CLRED AS IT WAS XA40 AT NIGHT AND WE RECEIVED NO RESPONSE. WE PROCEEDED TO MAKE TFC CALLS FOR THE FIELD AND LANDED UNEVENTFULLY. AFTER CLRING THE RWY; I CALLED NEW YORK APCH BACK TO CANCEL OUR IFR FLT PLAN. IT WAS AT THIS TIME THE CTLR SAID TO CONTACT TWR AGAIN. WE SAID IT WAS CLOSED AND TO CANCEL US OUT. HOWEVER; THIS TIME WE RECEIVED A DIFFERENT TWR FREQ. WE IMMEDIATELY CALLED THE TWR AND IDENTED OURSELVES. THE TWR CTLR WAS VERY UPSET AND ASKED US TO CALL ONCE WE GOT INSIDE. WE EXPLAINED WHAT HAD HAPPENED; BUT CTLR STATED IT WOULD BE WRITTEN UP ANYWAY. FACTORS: FATIGUE. LATE AT NIGHT AND THOUGHT TWR WAS CLOSED SINCE WE LEFT HPN AND THEIR TWR WAS ALSO CLOSED. NO RESPONSE EITHER. SHORT FLT WITH MANY CHKLISTS TO RUN; CREW WAS SEPARATE DURING THESE PHASES. BUSIEST TIME OF FLT; CONFIGURING ACFT; TALK TO COMPANY/PAX; TRYING TO RAISE TWR WITH NO RESPONSE. SUPPLEMENTAL INFO FROM ACN 303927: MY FO STATED THAT HE HAD BEEN CLRED FOR THE VISUAL RWY 9 AT NEWBERGH AND FREQ CHANGED. HE STATED HE HAD THE TWR FREQ IN THE RADIO AND REQUESTED LNDG CHKLIST.