CESSNA CITATION HAS PRESSURIZATION LOSS AND FMS FAILURE.

Narrative

THE INCIDENT OCCURRED WHILE ON AN INST FLT ORIGINATING OUT OF WINSTON-SALEM; NC (INT); AND ENDING AT BOSTON; MA (BOS). WHILE IN CRUISE FLT AT FL370; I NOTICED A HISSING SOUND COMING FROM AROUND THE MAIN CABIN DOOR. I CHKED THE CABIN CONTROLLER GAUGE AND IT INDICATED A CLBING CABIN PRESSURE. I IMMEDIATELY DONNED MY OXYGEN MASK AND ADVISED THE PIC/PF TO DO THE SAME; AND HE DID. AT THIS TIME THE RAPID DECOMPRESSION CHKLIST WAS BEGUN. PRIOR TO ITS COMPLETION; THE PRESSURE LEAK FROM AROUND THE CABIN DOOR INCREASED TO A VERY HIGH LEVEL. AT THIS POINT THE PIC/PF INITIATED AN EMER DSCNT; DURING WHICH THE ACFT WAS TURNED OFF THE AIRWAY. DURING THE EMER DSCNT AND AFTER COMPLETION OF BOTH RAPID DECOMPRESSION AND EMER CHKLIST; THE SECURITY OF ALL THE PAX WAS ASSURED AND THAT THEY ALL HAD THE OXYGEN MASKS ON AND WERE RECEIVING ADEQUATE OXYGEN. DURING THE DSCNT; ATTEMPTS WERE MADE TO NOTIFY ZNY OF OUR INTENTIONS. WHILE SQUAWKING 7700 XPONDER CODE; CONTACT WAS ESTABLISHED AND ATC NOTIFIED OF OUR EMER. THE PF LEVELED THE ACFT AT 10000 FT. I ADVISED THE PIC/PF AT THIS TIME WE SHOULD FLY TO THE NEAREST SUITABLE ARPT. THE PIC/PF DECIDED TO CONTINUE TO OUR ORIGINAL DEST AT 10000 FT OR LESS AND UNPRESSURIZED. ATC WAS ADVISED OF OUR INTENTIONS TO CONTINUE TO BOS AND THAT THE DECOMPRESSION EMER WAS OVER. ATC ISSUED A NEW CLRNC AND SQUAWK CODE FROM 7700. WHILE NAV TO BDR VOR; IT WAS NOTED THAT OUR FMS WAS MALFUNCTIONING WITH ERRONEOUS HDG AND DISTANCE INFO. WE ADVISED ATC THAT OUR FMS EQUIP HAD FAILED. WE CONTINUED WITH VOR NAV. WE WERE GIVEN AN ALT OF 9000 FT AT WHICH WE DSNDED TO AND I REMINDED THE PIC/PF OF OUR RESTR 250 KTS BELOW 10000 FT; AND THE FLT CONTINUED TO BOS WITH NO FURTHER INCIDENT. UPON LNDG; WE WERE ADVISED BY GND CTL TO CONTACT ZNY AND TELEPHONE NUMBER. THIS WE DID EXPEDIENTLY AFTER OUR ARR AT THE TERMINAL. I ADVISED ZNY BY PHONE WHAT EMER WE HAD; AND WHAT HAD TAKEN PLACE.