Patent ID: 8668457

Claim:
A trim balance for a gas turbine engine having a hollow rotatable rotor shaft, said trim balance comprising: an elongate support rod adapted for longitudinal accommodation within, and mounting on, an interior surface of said hollow rotor shaft; at least one balance weight supported on said support rod; a weight retainer disposed on said support rod for retaining said weight thereon such that said weight is selectively mountable on, and removable from, said support rod; wherein said elongate support rod is threaded and said weight retainer comprises a radially enlarged end portion of said support rod and a nut threaded on said rod, said balance weight being compressively retained on said rod between said nut and said enlarged support rod end portion; wherein said enlarged end portion of said rod includes at least one aperture in a longitudinally outer end thereof for receiving tooling for the mounting of said trim balance on and removal of said trim balance from said hollow rotor shaft.