RPTR PROTESTS RADIO COM SET UP IN ACFT RECENTLY PURCHASED BY HIS COMPANY; WHEN XMITTING ON VHF #2 THE COCKPIT SPEAKERS ARE MUTED.

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RECENTLY OUR AIRLINE PURCHASED AN LGT ACFT FROM ANOTHER AIRLINE. WHEN XMITTING ON VHF-2 #2; INTERPHONE OR PA THE OVERHEAD SPEAKERS ARE MUTED OUT. ON DEP FROM JFK TO DFW; WHILE ON NEW YORK CENTER; THE SO WAS DISCUSSING THIS PROBLEM WITH THE FLT'S DISPATCHER AND COMPANY MAINT ON VHF #2. ZNY ISSUED A CLRNC TO CLB AND TURN WHILE HE WAS TALKING SO IT WAS PARTIALLY MUTED OUT. THE PNF THE ACFT READ BACK THE CLRNC AND A CLBING TURN WAS INITIATED TO FL270 HDG OF 270. AFTER SEVERAL HUNDRED FT ATC CORRECTED THE READBACK AND A CORRECTION TO ALT WAS IMMEDIATELY MADE. THE CAPT HAD PREVIOUSLY WRITTEN THE PROBLEM UP TWICE BEFORE AND IT WAS SIGNED OFF AS NORMAL FOR THIS ACFT TYPE. AFTER THE INCIDENT THE MAINT COORD WAS CALLED AGAIN AND INFORMED OF THE SITUATION THAT JUST HAD OCCURRED. THE CAPT SUGGESTED THAT UNTIL THEY COULD REWIRE THE AIRPLANE TO CORRECT THE PROBLEM; THEY SHOULD MAKE A NOTATION ON SUBSEQUENT FLT PLANS. THIS WOULD ALERT THE CREWS OF THE MUTING AND THAT THEY SHOULD WEAR THEIR HEADSETS WHEN EVER VHF #2 IS USED. THE MAINT COORDINATOR SAID HE WOULD INFORM THE UPPER LEVEL MAINT PEOPLE WHO WOULD TAKE CARE OF THAT.