Stiffened structures and associated methods are disclosed. In one embodiment, an elongated metallic stiffening member can be attached to a composite sheet and positioned to resist bending of the composite sheet. In another embodiment, a structural system can include an elongated composite element attached between a composite sheet and a metallic stiffening member. In still another embodiment, the structural system is formed without attaching a honeycomb stiffening arrangement.

 
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> Overhead space access conversion monument and service area staircase and stowage system

> Window frame/seal assembly and method of forming the same

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