RADIO COM PROB -- THE CAPT OF THIS ACR BUMPED THE FREQ KNOB OF THE COM RADIO AND INADVERTENTLY CHANGED FREQ. THE FLC RECOGNIZED THE ERROR AND CORRECTED IT A SHORT TIME LATER.

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FLT XXX ORD TO EWR. WE WERE ON APCH VECTORS WITH NY APCH AT 5000 FT WHEN THE FREQ SELECTOR ON COM #1 RADIO WAS BUMPED CHANGING IT FROM 128.55 TO 127.55. THE MISTAKE WAS DETECTED AFTER ABOUT 2 MINS. THE FLT CONTINUED UNEVENTFULLY INTO NEWARK. NO TCASII ADVISORIES OR TFC CONFLICTS WERE NOTED. THE APCH CTLR HAD NO COMMENTS TO US UPON RECHKING IN WITH HIM AFTERWARDS. THE FLT WAS ORD TO EWR IN F100. WE WERE AT 5000 FT ON APCH VECTORS INTO NEWARK. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE FLC OF THIS F100 WAS ABOUT 25 NM W OF EWR WHEN THE CAPT; WHO WAS OPERATING THE RADAR; BUMPED THE FREQ SELECTOR FOR THE VHF COM RADIO CAUSING IT TO CHANGE FREQS. AFTER ABOUT 2 MINS; WHEN THE CREW REALIZED THAT THERE WAS AN UNUSUAL SILENCE; THE CAPT RECHKED THE FREQ READOUT AND CORRECTED THE SIT. THE CAPT SAID THAT THERE WERE TSTMS IN THE AREA; BUT THAT THE ACFT WAS IN THE CLR AT THIS TIME. HE DOES NOT THINK THAT THE RADIO CTLS ARE TOO EXPOSED TO THIS TYPE OF EVENT AND THAT THIS WAS THE FIRST TIME THAT THIS HAS HAPPENED TO HIM.