BE02 CREW WAS ALMOST HIT BY A PA28 DURING BACK TAXI TO RWY.

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ACR FLT ABC; BE1900C; WAS TAXIING FROM RAMP AREA TO RWY 31 AT ROCKLAND. LEAVING THE TERMINAL; CTAF BROADCAST WAS MADE 'ROCKLAND TFC ACR #ABC; TAXI FROM TERMINAL HOLDING SHORT OF RWY 31 ROCKLAND.' A CHEROKEE RESPONDED ON THE LOW APCH FOR RWY 21 AT ROCKLAND. AT THE HOLD SHORT LINE FOR RWY 31; ACR ABC AGAIN BROADCAST 'HOLDING SHORT OF RWY 31 ROCKLAND.' CHEROKEE RESPONDED ON THE XWIND RWY 21. ACR ABC CALLED FOR IFR RELEASE FROM BRUNSWICK APCH; CTAF 122.8 IS ALWAYS ACTIVE ON COM #1; NO CTAF XMISSIONS WERE HEARD; AS ACR ABC MADE CTAF XMISSION 'ACR ABC; A BE1900; BACK TAXI RWY 31 ROCKLAND;' NO OTHER TFC WAS RESPONDING. AS IS MY HABIT PATTERN; THERE IS ALWAYS A VISUAL CONFIRMATION THAT NO CONFLICT EXISTS -- IE; COLLISION ON RWY WITH OTHER ACFT. THE ACR BE1900 TURNED TOWARDS RWY 31 FROM TXWY. THERE WAS A C172 #XXX JUST ROTATING ON TKOF RWY 31. ACFT XXX DID NOT MAKE ANY CTAF CALLS PRIOR TO DEP. HAD I NOT CLRED THE RWY BEFORE TAXIING ONTO IT; WE WOULD HAVE A CATASTROPHIC EVENT -- 2 AIRPLANES COLLIDING. THE OPERATOR OF THE C172 PLACED THE CREW AND PAX AT RISK. NON CONFORMANCE TO AIM CTAF PROCS BY A FAR 91 PVT PLT ARE CAUSAL FACTORS. LUCKILY; WE (THE CREW OF ACR ABC) WEREN'T AS COMPLACENT AS THE CHEROKEE PIC.