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.

Pages 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 - 13 - 14 - 15 - 16 - 17 - 18 - 19 - 20 - 21 - 22 - 23 - 24 - 25 - 26 - 27 - 28 - 29 - 30 - 31 - 32 - 33 - 34 - 35 - 36 - 37 - 38 - 39 - 40 - 41 - 42 - 43 - 44 - 45 - 46 - 47 - 48 - 49 - 50 - 51 - 52 - 53 - 54 - 55 - 56 - 57 - 58 - 59 - 60 - 61 - 62 - 63 - 64 - 65 - 66 - 67 - 68 - 69

MIL-STD-209K

be based on using two provisions for restraint in both longitudinal directions (fore and aft), two provisions for restraint in both lateral directions (left and right), and four provisions for restraint in the vertical direction.  Although some vehicles are normally transported together (i.e. truck/trailer combinations), each vehicle's equipment tiedown provisions shall individually meet the strength requirements of this standard.  A sample problem that shows how to determine the required strength of the equipment tiedown provisions is in appendix C.  No permanent deformation of the provision or other equipment structural components shall occur as a result of application of the loads to the equipment tiedowns.  The ultimate load that each equipment tiedown provision can withstand shall not be less than 1.5 times the design limit load.

5.2.3.1   Option for equipment weighing 50,000 pounds or more.

To aid in meeting the strength requirements of 5.2.3, equipment weighing 50,000 pounds or more can have two openings on each equipment tiedown provision that are at least 3.5 inches in diameter each (dimension Dmin in Figure 3).  This is in lieu of having one large opening for the provision. The resulting provision with two openings must meet all the other dimensions in Figure 3 for it's weight category.   Figure 8 is an example of a provision with two openings.  Both openings of the provision will be tested simultaneously.

5.2.3.2  Strength of helicopter equipment tiedown provisions.

Helicopters must be designed to be restrained to 3gs in the forward and aft longitudinal directions, 1.5gs in the lateral direction, and 2gs in the vertical direction. When designing equipment tiedown provisions on helicopters, the location options can be limited by the structure of helicopters.  Additionally, because of the desire to load as many helicopters as possible into C-5 and C-17 aircraft, helicopters may be oriented at various angles to the longitudinal axis of the fixed wing aircraft.  When determining the required strength of helicopter equipment tiedown provisions, an analysis of the loads encountered during orientations other than parallel to the longitudinal axis must be considered. This will ensure that the equipment tiedown provisions on helicopters can provide adequate restaint during fixed wing air transport.

5.2.4  Provision Dimensions.

Equipment tiedown provisions shall conform to the dimensions specified in Figure

3.  See paragraph 5.2.3.1 for the dimensional requirements if two openings are used in lieu of one for equipment weighing 50,000 pounds or more.  For equipment tiedown provisions, the maximum dimensions of the resulting cross section shall be capable of being inscribed in a 2-inch diameter circle (see Figure 9). This cross section shall be on the parts of the provisions that would be contacted by hooks pulling in the directions described in 5.2.2.f.

Source:  https://assist.dla.mil  --  D1o5wnloaded:  2014-09-28T23:10Z Check  the  source  to  verify  that  this  is  the  current  version  before  use.