LDEF (Prelaunch) The LDEF structure is shown mounted on the LDEF Assembly and Transport System in Building 1250 at the Langley Research Center (LaRC), Hampton Virginia, during pre-ship wiring checks. The structure is a welded / bolted assembly fab- ricated from aluminum alloy 6061-T6 extrusions, forgings, tubing and plate materials and assembled with stainless steel fasteners. The eight (8) internal tubular diagonals between the center ring structure and the two end frames provide torsional stiffness to the structure.
