MIL-STD-209 Lifting And Tiedown ProvisionsThis standard establishes dimensional limits, design considerations, positioning requirements, and strength requirements for lifting to include helicopter sling load HSL and tiedown provisions for lifting or tying down tanks and other tracked vehicles, tactical wheeled vehicles, helicopters, and other military equipment shipped assembled or disassembled in unboxed or uncrated condition, and for restraining cargo or accessories to such equipment. The lifting and tiedown requirements in this standard are necessary to permit compatibility between military equipment and the transportation systems used for deployments.

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MIL-STD-209K

3.13  Multipurpose provision.

A single provision that meets the requirements of this standard for both lifting and equipment tiedown (see Figure 1).

3.14  Permanent deformation.

Any visible permanent change in the original dimensions or shape of the provision or connecting structure resulting from an applied force.

3.15  Plane of the provisions.

A geometric plane connecting the centers of all lifting provisions of an item of equipment. The "plane of the provisions" will only be a horizontal plane if the height of the front and rear provisions is the same (see appendix B for a pictorial of the "plane of the provisions").

3.16  Static lift test.

A test consisting of rigging and statically lifting the item to verify the rigging configuration and identify clearance problems.

3.17  Static load.

The anticipated maximum resultant force imposed on the provision when an item, at GW, is suspended in a specified lifting configuration without movement.

3.18  Supplemental air transport tiedown provision.

A  padeye, fixture, or attachment used in addition to the equipment tiedown provisions for securing equipment on fixed-wing aircraft (see Figure 1).

3.19  Ultimate load.

The force (not less than the design limit load times 1.5) that a provision, including its connecting structural members, can sustain without breaking, rupturing, or otherwise becoming unusable.

3.20  Yield load.

The force at which a provision, including its connecting structural members, exhibits permanent deformation after the force is removed.  The yield load must be greater than the design limit load.

4.  GENERAL REQUIREMENTS

4.1  Restraint of Item.

The tiedown provisions shall provide the entire restraint of the item without any other restraint such as blocking, vehicle brakes, or other added material.

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