A BE1900 FLT ENTERS RWY PREMATURELY; NOT KNOWING THAT IT WAS GOING TO BLOCK THE APCH OR NORAC TFC IFR INBOUND TO BHB; ME.

Narrative

MONITORED CTAF AT BAR HARBOR ARPT AND TAXIED OUT TO RWY 4. CAPT INSTRUCTED ME TO CONTACT BANGOR TO GET IFR CLRNC TO BOSTON. APCH INDICATED THEY HAD IFR TFC INBOUND AND WE COULD HOLD FOR RELEASE OR DEPART VFR AND PICK CLRNC UP IN THE AIR. I ASKED CAPT WHAT HE WANTED TO DO. HE SAID WE HAVE TIME TO DEPART. BASE TO FINAL TFC TOUCHED DOWN SO CAPT PUT US IN POS AND HOLD ON RWY 4. TFC ROLLING OUT ON RWY 4 DID A TOUCH-AND-GO WHICH HE DID NOT PREVIOUSLY INDICATE HE WAS GOING TO DO. WAITED TILL TFC TURNED XWIND AND CAPT BROUGHT PWR UP AND WE BEGAN TKOF ROLL. UPON TURNING DOWNWIND FOR DEP; SOMEONE ON RADIO ASKED 'HEY; ACR X; DON'T I GET AN APOLOGY?' CAPT TALKED TO PERSON ON GND THE NEXT DAY AND INDICATED THAT HE DIDN'T HEAR GENTLEMAN MAKE 5 RADIO CALLS AS CLAIMED ON CTAF. I ALSO DIDN'T HEAR RADIO CALLS. THE PERSON INDICATED THAT HE KNEW THE GENTLEMAN IN QUESTION AND THAT HE HAD PREVIOUSLY BEEN ADVISED TO HAVE WEAK RADIOS CHKED FOR XMITTING CAPABILITY. I DID NOT SEE IFR TFC APCHING OR LNDG FROM MY SIDE OF THE COCKPIT. HOWEVER; I BELIEVE THAT CAPT IS A VERY CAPABLE/SAFE PLT AND THAT WOULD NOT HAVE PUT ANYONE IN DANGER INTENTIONALLY.