Panel for lining a gas turbine engine fan casing

A panel for lining a gas turbine engine fan casing, the panel including a honeycomb core sandwiched between a backing skin and an outer skin,

• the backing skin being adapted to be attached to an inner surface of the casing such that the outer skin forms a radially inward facing surface of a fan duct of the engine, and the panel further being adapted to be joined along sides thereof to similar neighbouring panels such that, in use, the joined panels form a row of panels along the inner surface of the casing;
• the outer skin or the backing skin including two face sheets bonded on top of each other, the face sheets being arranged such that the edges of the two face sheets along each panel side that joins to a neighbouring panel are staggered in the direction of the row, whereby, when the edges of the two face sheets are butted against edges of matching face sheets of a neighbouring panel, the interfaces between the abutting face sheet edges are correspondingly staggered in the direction of the row.