MIL-STD-1365C
4.4.3.1 Nonmetallic materials. Nonmetallic materials shall not produce more than 1 percent permanent deformation when loaded to one and one half times the rated load measured 24 hours after removal of the load. To avoid creep, the design load should be selected in the range of one-tenth to one-fifth of the breaking strength, the former being preferred. In addition, the material shall withstand a load not less than five times the rated load without any sign of failure.
4.4.3.2 Metallic elements. Requirements for metallic elements are as specified in table I and in 4.4.1.1.
4.4.3.3 Wire rope, chain and associated fittings. The dynamic loads shall not exceed 16 percent of the minimum breaking strength. Navy wire rope slings shall have eye splices that are fabricated using Flemish Eye construction method in accordance with NAVSEA Drawing 6213972. Navy slings that utilize a wire rope less than
ΒΌ-inch diameter shall have eye splices that are fabricated using turnback eye construction method in accordance with NAVSEA Drawing 6213973. Natural fiber core wire rope shall not be used for lifting equipment developed
under this standard. The use of chain in lifting equipment is permissible but not desirable. In selecting materials for
lifting equipment, effects of deflection under load and repeated loading shall be considered.
4.4.3.4 Multiple-leg slings. When a sling contains more than one leg, each leg shall be capable of supporting the entire dynamic load.
4.4.4 Weight. Weight limitations shall be as specified by the procuring activity in the applicable specification; however, to the maximum extent possible, consistent with military service requirements, simple construction shall be used to provide the lowest weight possible to comply with human engineering requirements, safety, and reliability. Unless otherwise specified by the procuring activity or the applicable development specification (see
6.2), maximum permissible gross weight of any unit (e.g., missile and transfer dolly) during UNREP is 6,000 pounds with a 4,000 pound maximum preferred,. Simplicity, reliability, safety, or strength shall not be sacrificed to minimize weight. When the weight of an item exceeds 75 pounds, the weight shall be identified on the equipment.
4.4.5 Materials. Materials used for components, which are likely to be subjected to adverse weather conditions, shall be either protected against deterioration or the component made of materials that do not deteriorate under climatic and environmental conditions. The use of protective coatings that will crack, chip, or scale shall be
avoided.
4.4.5.1 Dissimilar metals. Dissimilar metals are those which generate an electric current resulting from galvanic action when two specimens are either in contact or are electrically connected in a conductive solution (electrolyte). Since dissimilar metals can be subjected to accelerated corrosion, protection against galvanic action shall be required by providing proper electrical insulation at the dissimilar metal interface or by eliminating the electrolyte where feasible. Further, the choice of dissimilar metals in contact with each other should be made using the Galvanic Series as a guide so as to select combinations having electrical potentials which are similar or near one another. A source for further guidance concerning dissimilar metals may be found in 6.3.
4.4.5.2 Corrosion. Metal parts subject to corrosion shall be protected with commercially available surface treatments and coatings that will prevent such corrosion when the equipment is subjected to the environment specified by the procuring activity or the development specification (see 6.2). Cadmium coating or plating shall not be used. Paint shall be lead and chromate free.
4.4.5.3 Fungus proof materials. Materials that are nutrients for fungi should not be used where it is practical to avoid them. In the event they are used and not hermetically sealed, the item shall be treated with a suitable fungicidal agent (see 4.9.2).
4.4.6 Lifting equipment designed for use in a constrained space environment. Additional forces imposed on lifting equipment as a result of handling AEODA in a constrained space environment shall be accounted for when establishing their capacity. Lifting equipment includes slings, beams, strongbacks, carriers, or any other equipment which supports a suspended load. An example of a constrained space environment would be a launch cell (or tube) where forces such as friction, surface tension, or vacuum act against a missile canister shell during its extraction, causing an increase in tension (over and above the weight of the static load) on the lifting equipment. For purposes of this paragraph, and rigging safety, the applied load experienced in a constrained space environment shall not exceed the safe working load (capacity) of the lifting equipment.
10
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business