Method to replace an abradable layer on a gas turbine fan casing

摘要

The procedure is designed for use on a turbojet engine with a rotary section that has a fan stage with a hub and series of blades at the forward end of its shaft inside an annular casing (60) with an abradable layer (80) stuck to its inner surface (70). It consists of removing the worn abradable layer, cleaning and applying adhesive (82) to the casing's inner surface, and fitting the new abradable layer against it. The inner, sealing surface (84) of the abradable layer is then fitted with a heating band (100), to which a pressure is applied by at least three supporting sectors (110) with inflatable chambers (120), the sectors being held in place by brackets (125) attached to the fan casing by fixings (96).