Patent ID: 7234916

Claim:
A method for field balancing a gas turbine engine assembly including a power turbine, said method comprising: coupling the power turbine to a load; identifying a first balancing plane that is aft of the power turbine; identifying a second balancing plane that is forward of the power turbine; determining a balancing correction at each of the first and second balancing planes; mounting a balance weight at the first balancing plane based on the balancing correction determined for the first balancing plane; and mounting a balance weight at the second balancing plane based on the balancing correction determined for the second balancing plane such that the balance weight contacts a portion of the second balancing plane, wherein each balance weight at the second balancing plane is coupled to a respective bolt head of only one coupler, that includes a threaded stud extending from the bolt head in a direction opposite to an longitudinal extension of a shank portion of the coupler, the balance weight is coupled to the respective bolt head without removing the bolt.