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 APPENDIX C

= 1.5 x T

=  1.5 x 26,667 lb  =  40,000 lb

Aft            U

= 1.5 x T

=  1.5 x 53,333 lb =  80,000 lb

= 1.5 x T

=  1.5 x 26,667 lb  =  40,000 lb

C.4.1.2  Minimum required vertical design and ultimate loads.   The vertical inertia force acting through the CG is:

2 x GW = 2 x 20,000 lb = 40,000 lb

It should be assumed that this force will be restrained by the vertical force compo- nents of all four tiedown provisions against upward movement of the item.

1V           2V           3V           4V

= 40,000 lb

For this example, the provisions are not located symmetrically about the CG so the proportionate share of the load that is applied to each provision is not equal and is as follows:

      S 2        

      L3        

T     =   (S

+  S  ) x  (L

+  L  )

x (T    + T    + T    + T   )

1V                  1             2

10

1V   =  (5  +  10)  x

      S1        

1              3

10

(15  +  10)

      L4        

x 40,000 = 10,667 lb

T     =  (S

+  S  ) x  (L

+  L  )

x  (T    + T    + T    + T   )

2V                1             2

5

2V    =  (5  +  10)

2              4

10

x  (15  +  10)

x 40,000 = 5,333 lb

      S 4        

      L1        

T     =   (S

+  S  ) x  (L

+  L  )

x (T    + T    + T    + T   )

3V                  3              4

10

3V  =  (5  +  10)  x

1              3

15

(15  +  10)

x 40,000 = 16,000 lb

Source:  https://assist.dla.mil  --  DCow-4nloaded:  2014-09-28T23:10Z Check  the  source  to  verify  that  this  is  the  current  version  before  use.

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