A method of inspecting the fan track liner of a gas turbine engine of a type having a rotatable propulsive fan circumscribed by a fan track liner and having a plurality of fan blades extending radially outwardly from a central hub. The method comprises the steps of: affixing at least part of an inspecting device to the fan so as to be directed towards the fan track liner; and rotating the fan within the fan track liner to move the at least part of the inspecting device circumferentially relative to at least a region of the fan track liner to thereby scan the region of the fan track liner with the at least part of the inspecting device.