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

hat - distance from provision a to the CG, on the plane of the provisions, when the equipment is lifted with equal length slings, in inches

hbt - distance from provision b to the CG, on the plane of the provisions, when the equipment is lifted with equal length slings, in inches

hct - distance from provision c to the CG, on the plane of the

provisions, when the equipment is lifted with equal length slings, in inches

hdt - distance from provision d to the CG, on the plane of the provisions, when the equipment is lifted with equal length slings, in inches

Ha - apex height, from the ground to the top of the equal length single apex sling assembly, in inches

Hf - height from the ground to the front provisions, a and b, in inches

Hr - height from the ground to the rear provisions, c and d, in inches

Ht - vertical distance between the horizontal plane and the plane of the provisions, on the CG axis, in inches

K - vertical distance between the CG and the sling apex when the equipment is lifted with equal length slings, in inches

L - longitudinal distance between front and rear provisions, measured on a horizon- tal plane, in inches

Lf - longitudinal distance from front provisions, a and b, to the CG, on a horizontal plane, in inches

Lr - longitudinal distance from front provisions, c and d, to the CG, on a horizontal plane, in inches

Lx - longitudinal distance from the rear provisions to the intersection of KL with the plane of the provisions, when the item is resting on a level surface, in inches

Ly - longitudinal distance from the rear provisions to the intersection of KL with the plane of the provisions, when the item is resting on a level surface, in inches

Lxy - longitudinal distance between the front provisions and the rear provisions on the plane of the provisions, in inches

Ra - static load on sling a, in pounds

Source:  https://assist.dla.mil  --  DBow-2nloaded:  2014-09-28T23:10Z Check  the  source  to  verify  that  this  is  the  current  version  before  use.