An auxiliary longitudinal member of the structural framework of a fuselage, nacelle, empennage, wing, and the like. It is designed to stiffen and/or support the skin by attachment of bulkheads, formers, frames, ribs, and the like.
NSN 5915-01-497-2821
NSN 6645-01-487-7456
NSN 5910-01-030-2275
NSN 6620-01-419-8014
NSN 5990-00-277-3763
NSN 5920-01-465-6312
NSN 6650-01-323-6252
NSN 6685-01-576-8757
NSN 6685-01-458-2859
NSN 6135-01-268-7056
NSN 6110-01-342-1932
NSN 5985-00-893-0917