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 B

Rb - static load on sling b, in pounds Rc - static load on sling c, in pounds Rd - static load on sling d, in pounds S - sling leg length, in inches

SA - angle of the slings, with respect to the plane of the provisions, in degrees

Ta - design limit load of provision a, in pounds Tb - design limit load of provision b, in pounds Tc - design limit load of provision c, in pounds Td - design limit load of provision d, in pounds

Ua - ultimate load requirement of provision a, in pounds Ub - ultimate load requirement of provision b, in pounds Uc - ultimate load requirement of provision c, in pounds Ud - ultimate load requirement of provision d, in pounds Va - vertical load at provision a, in pounds

Vb - vertical load at provision b, in pounds Vc - vertical load at provision c, in pounds Vd - vertical load at provision d, in pounds

VAa - angle between the sling leg attached to provision a and the vertical when the equipment is lifted with equal length slings, in degrees

VAb - angle between the sling leg attached to provision b and the vertical when the equipment is lifted with equal length slings, in degrees

VAc - angle between the sling leg attached to provision c and the vertical when the equipment is lifted with equal length slings, in degrees

VAd - angle between the sling leg attached to provision d and the vertical when the equipment is lifted with equal length slings, in degrees

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