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 6130-01-245-9226
NSN 5935-01-142-2930
NSN 5945-01-189-4086
NSN 6110-00-773-0915
NSN 5925-00-226-1155
NSN 5965-01-452-7874
NSN 5950-01-412-5055
NSN 5915-00-315-3583
NSN 5950-01-567-6728
NSN 6620-01-053-6650
NSN 5915-01-282-2610
NSN 5950-01-292-3426