Abstract: Lightning protection system (1) for aircraft structures, comprising a fastening element (4) for attaching an internal structure (63) to an external structure (62), and a composite material providing lightning protection to areas surrounding the fastening element (4), the lightning protection system (1) comprising at least one conductive layer (2, 3) embedded in the matrix of said composite material and in proximity to the fastening element (4), the conductive layer (2, 3) comprising conductive nanoparticles dispersed within its structure.

Abstract: An aircraft telescopic in-flight refueling mast comprising a metallic structural beam (31), electrically connected to the aircraft by flexible conductive means (33), having inside a fixed metallic tube (11) and a metallic telescopic tube (11) providing the fuel conduit, and, attached to said beam (31), flight control surfaces (41) and protection means against electric discharges, specially lightning strikes and electro-static discharges, including insulated means (39, 51) and low conductive means (15, 17) for reducing the lightning currents at a safe level and for draining the static charge created during the refueling, and conductive means (19, 21, 23, 33, 43) providing a safe lightning current path and good electrical bonding for electro-static discharge.