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

f.  The contractor shall provide a material analysis showing the ultimate load is not less than 1.5 times the required design limit load for the provisions.

5.6   Supplemental air transport tiedown provisions.

Supplemental air transport tiedown provisions will be provided on all equipment weighing over 10,000 pounds or more with an internal air transport requirement.  These provisions allow flexibility in air transport restraint and reduce floor space between equipment items to maximize aircraft utilization.

5.6.1  Number.

The number of supplemental air transport tiedown provisions is dependent upon the weight of the item, the strength of the provisions (see 5.6.3), and the directional capabilities of the provisions (see 5.6.6).  The minimum number of air transport tiedown provisions is given in Table III.

5.6.2   Location.

The provisions shall be located symmetrically about the equipment longitudinal centerline.  Provisions shall be located to provide restraint in both the fore and aft direction of the equipment.  The area of action for each provision is illustrated in Figure

13.  Longitudinal spacing between provisions shall be no less than 20 inches for 10,000 pound provisions, and 40 inches for 20,000, 25,000 pound, and 50,000 pound provisions.  If a provision's location is suitable for use in only one direction, an additional provision must be provided for use in the opposite direction.  Restraint devices should not contact any other part of the equipment.  When a restraint device must contact a

part of the equipment, testing must demonstrate that the affected part(s) has sufficient strength to withstand the force exerted to prevent permanent deformation of any part of the equipment, and that contact will not adversely affect the material of the tiedown device.  Provisions shall be located on the chassis of wheeled vehicles or the hull of tracked vehicles.  Provisions may be no higher than 6 feet on the equipment and no less than 2 feet.

5.6.3  Strength.

Supplemental air transport tiedown provisions are rated according to their strength throughout the required area of action.  The design load limit for supplemental air transport tiedown provisions shall be 10,000 or 20,000 pounds for vehicles suitable for transport by C-130 and larger aircraft.  For vehicles transportable only by C-5 and C17 aircraft, the provisions should have a design limit load of 25,000 or 50,000 pounds.  All supplemental air transport tiedown provisions on equipment must have the same design limit load.  Provision strength includes all load bearing structures associated with each provision.  The ultimate load that each equipment tiedown provision can withstand shall not be less than 1.5 times the design limit load.

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