Slings of this type are constructed with plates, tubing, I-beams, and other structural shapes, and they do not contain flexible components. See figure 3-21. Structural steel and aluminum slings are generally compact in size, and they are often used for lifting aircraft subassemblies.

Figure 3-22.Combination wire rope and chain sling.

Chains are generally used in combination with one of the other types of sling construction. See figure 3-22. A chain with a chain adjuster provides a simplified method of shifting the lifting point on a sling to match the components center of gravity under a variety of hoisting configurations.

Load-bearing cables, chains, straps, and other structural members of hoisting and restraining devices are subject to wear and deterioration. It is necessary that these components be inspected and lubricated periodically to ensure safe and proper operation. On initial receipt of equipment or return of equipment from depot-level repair, the aircraft intermediate maintenance department will perform a visual inspection of the hardware for missing or damaged components. Upon completion of the inspection, they tag all equipment in accordance with the Inspection and Proofload Testing of Lifting Slings and Restraining Devices for Aircraft and Related Components NAVAIR 17-1-114.