ACR MDT ACFT DAMAGED AFTER HITTING TUG IN RAMP OP.

Narrative

ON THE MORNING OF THE 4TH; I WAS INSTRUCTED TO PERFORM A TEST FLT ON ACFT WITH CAPT X TO TEST THE SHIMMY DAMPENER OF THE NOSE GEAR OF THE MDT. UPON REACHING THE ACFT; I PERFORMED THE PREFLT INSPECTION AND PROCEEDED TO THE FLT DECK TO COMPLETE MY PREFLT DUTIES. A COMPANY MECH WAS IN THE JUMPSEAT TO OBSERVE THE TEST FLT. AS I WAS CONTINUING MY PREFLT DUTIES; THE CAPT REACHED UP AND DEPRESSED THE START BUTTON FOR #2 ENG. AT THIS POINT; I REALIZED THE CAPT DID NOT INTEND TO PERFORM THE BEFORE STARTING CHKLIST. WITH THE INTENTION TO READ AND COMPLETE THE CHKLIST MYSELF; I REACHED FOR THE CHKLIST AND CONTINUED TO PROCEED WITH THE ITEMS. MY HEAD WAS DOWN PERFORMING THE CHKLIST WHEN I HEARD 'BRAKES; BRAKES.' THE ACFT ROLLED FORWARD APPROX 3 FT AND STRUCK THE GPU. A SMALL HOLE; THE SIZE OF A QUARTER WAS PIERCED IN THE FUSELAGE ON THE R SIDE JUST BEHIND THE NOSE CONE. THE PARKING BRAKE HAD NOT BEEN SET APPROPRIATELY AS CALLED FOR BY THE BEFORE STARTING CHKLIST. MAINT HAD RELEASED THE FLT AND TAXIED THE ACFT TO THE RAMP FOR OUR TEST FLT AND HENCE THE PARKING BRAKE WAS NOT SET AS IS NORMAL WHEN PARKING THE ACFT.