COMMUTER FERRY FLT INTO PSM ARPT IS UNABLE TO ESTABLISH RADIO CONTACT WITH PSM TWR. LANDS WITHOUT COM WITH ARPT. ACFT EQUIP PROB CONSIDERATIONS GOVERNED THE PIC'S FLC PLANNING. INFLT ON THE FINAL APCH.

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APPROX 3 MINS BEFORE LNDG IN PORTSMOUTH; NH; ON AN IFR FLT PLAN IN NIGHT/VMC CONDITIONS; MANCHESTER APCH ADVISED OUR CREW THAT THEY COULD NOT CONTACT PEASE TWR VIA RADIO OR LAND-LINE COMS. AT THIS TIME; WE DECIDED TO CANCEL IFR AND CONTINUE WITH A VISUAL APCH INTO PORTSMOUTH. WE ALSO WERE UNABLE TO COM WITH PEASE TWR OR GND; ATIS WAS NOT BEING BROADCAST; AND NO LIGHT GUN SIGNALS WERE GIVEN. THE CAPT AND MYSELF DECIDED TO CONTINUE AND LAND DUE TO A FERRY PERMIT WE WERE OPERATING ON. THE PERMIT WAS FOR AN ACFT WITH AN ENG OF QUESTIONABLE HEALTH. THE ARPT WAS NOT NOTAMED CLOSED; ALL THE ARPT LIGHTS WERE ON; AND NO OBSTRUCTIONS WERE SEEN. ONCE ON THE GND WE CONTINUED TO TRY TO COM WITH PEASE VIA RADIO WHILE TAXIING TO OUR MAINT HANGAR. OUR COMPANY FLT CTL TRIED TO CALL THEM VIA LAND-LINE WITH NO RESPONSE. THE PEASE TWR WAS UNMANNED FOR UNKNOWN REASONS; AND MORE STAFFING SHOULD BE CONSIDERED. SUPPLEMENTAL INFO FROM ACN 281074: I WAS FERRYING AN AIRPLANE WITH A BAD R ENG DUE TO COMPRESSOR STALLS AND OVER TEMP EARLIER IN THE DAY. TO GAR WOULD BE CHANCING POSSIBLE ENG FAILURE AT THE HIGH TORQUE SETTING REQUIRED.