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

C.4.1.1  Minimum required longitudinal design and ultimate loads.  The longitudinal inertia force acting through the CG is:

4 x GW = 4 x 20,000 lb = 80,000 lb

Assume the inertia force will be balanced/restrained by the longitudinal components of the applicable tiedown provisions to restrict the movement of the item in the forward and aft directions.

a.  To restrict movement in the forward direction, two provisions can be used:

3L           4L

= 80,000 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 4  x (T3L  + T4L )

10 x 80,000

3L                   (S

3  + S4 )

=       (5  +10)     =  53,333 lb

S 3  x (T3L  + T4L )

5 x 80,000

4L                   (S

3  + S4 )

=      (5  +10)    =  26,667 lb

b.  To restrict movement in the aft direction, two provisions can be used:

T1L  + T2L = 80,000 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  x (T1L  + T2L )

10 x 80,000

1L                    (S

1  + S2 )

=       (5  +10)      =  53,333 lb

S1  x (T1L  + T2L )

5 x 80,000

2L                   (S

1  + S2 )

=      (5  +10)     =  26,667 lb

Ultimate load requirements (1.5 x design limit load) are:

Forward    U

= 1.5 x T

=   1.5 x 53,333 lb  =  80,000 lb

Source:  https://assist.dla.mil  --  DCow-3nloaded:  2014-09-28T23:10Z Check  the  source  to  verify  that  this  is  the  current  version  before  use.

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