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 5975-01-245-4155
NSN 6130-00-470-5195
NSN 5925-01-064-4712
NSN 6240-00-896-6334
NSN 6620-01-027-4159
NSN 5855-01-062-5655
NSN 6320-00-116-3658
NSN 5985-01-535-6924
NSN 4140-01-161-8828
NSN 5985-01-358-4081
NSN 5855-01-267-2751
NSN 5996-00-202-6576