THE PLT OF A PARACHUTE DROP ACFT DID NOT COM WITH ATC PER LOA. PLT CALLED WITH 2 MIN PRIOR WARNING OF JUMPERS AWAY. PLT LOST XMITTER AND COULD NOT ACKNOWLEDGE RPTR'S REPEATED CALLS.

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PARACHUTE JUMPERS AT THE STEWART SECTOR (SECTOR 5) AREA E; AT THE ZBW ARE CAUSING DAILY INCIDENTS TO OCCUR AND ONE OF THEM IS GOING TO BE FATAL. IN THIS PARTICULAR INCIDENT JUMP ACFT 2 DID NOT CHK ON FREQ; AS PER LOA; ON HIS CLBOUT. INITIAL CONTACT FROM HIM WAS WHEN HE GAVE HIS 2 MIN PRIOR WARNING TO DROPPING HIS PARACHUTE JUMPERS. I ISSUED 2 TA'S TO HIM THAT WERE DISPLAYED ON MY RADAR AND THERE WAS NO RESPONSE. NEW YORK APCH ALSO HAD ADDITIONAL TFC; BUT I TRIED AT LEAST 7 TIMES TO ADVISE JUMP ACFT 2 AND HE NEVER ACKNOWLEDGED. SUBSEQUENTLY HE DROPPED HIS JUMPERS AND DSNDED WITHOUT WORD TO THE CTR. I HAD COMPANY JUMP ACFT 1; WHEN HE LANDED; TO HAVE JUMP ACFT 2 CALL THE CTR. HIS EXPLANATION WAS THAT HIS XMITTER WAS NOT FUNCTIONING; BUT HE WANTED TO CONTINUE TO COME UP AND DROP PARACHUTE JUMPERS AND WE WERE TO 'ASSUME' THAT HE COULD HEAR US IF THERE WAS NO RESPONSE -- WHICH IS COMPLETELY UNSAFE AND UNACCEPTABLE. I CAN'T JUST LET AN ACFT CLB; DSND; AND DROP PARACHUTE JUMPERS AT WILL AND JUST 'ASSUME THAT HE HEARS MY ADVISORIES' -- ESPECIALLY IN SUCH A BUSY SECTOR. THESE JUMPING ACFT HAVE TOTAL CTL OF THE SECTOR AND WE KEEP BEING TOLD THERE IS NOTHING WE CAN DO ABOUT IT.