b. Not less than 1 inch of clearanc

b. Not less than 1 inch of clearance should be maintained between the equipment and the slingcables, chains, or the rope portion of helicopter slings. The 1 inch clearance requirement applies when the equipment is lifted with the minimum equal length sling legs (see 5.1.2.a), with sling angles ranging from a 45° single apex sling assembly (this angle will be more than 45° if the spacing of the provisions dictates the use of 12 foot slings (see 5.1.2.a), and if the weight of the equipment is 67,200 pounds or less), to those same sling legs attached to a 20- foot ISO container spreader bar (Figure 4). When a sling leg must contact a part of the equipment, testing or computer-aided engineering structural analysis must demonstrate that the affected part(s) has sufficient strength to withstand the force exerted by the sling leg to prevent permanent deformation of any part of the equipment, and that contact will not adversely affect the material of the sling device.