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 6135-01-111-1495
NSN 6220-01-284-6347
NSN 5920-01-143-2212
NSN 5999-01-263-3657
NSN 5855-00-832-9341
NSN 5950-00-243-9481
NSN 5930-00-920-6290
NSN 6105-00-518-1854
NSN 5935-00-196-2293
NSN 5835-01-121-2098
NSN 6135-01-575-8362
NSN 5975-01-333-1798