| 主权项 |
1. A method of balancing a set of retaining and locking plates used to retain a row of gas turbine engine aerofoil blades in attachment to a rotor disc, the aerofoil blades having root fixings which are slidable into corresponding slots formed in the disc, the retaining plates being positioned in a circumferential row at a rim of the disc to prevent the root fixings sliding out of the slots, and the locking plates being introduced into the circumferential row between pairs of retaining plates to lock the retaining plates in position, the method including:
providing a weighing plate having a circular track corresponding to the position of the circumferential row at the rim of the disc; providing a non-rotating, static balancing apparatus capable of detecting unbalance in the weighing plate; positioning the weighing plate on the static balancing apparatus, and positioning the set of retaining and locking plates on the track in an arrangement corresponding to a possible arrangement for the set of plates in the circumferential row at the rim of the disc; and repositioning the retaining and locking plates on the track to arrive at a balanced arrangement for the set of plates which reduces unbalance produced by the set of plates to below a predetermined threshold. |
