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

GW = 10,000 lb

Lf = 56 in.,     Lr = 79 in.      Hf = 24 in.,     Hr = 33 in. Da = 16 in.,    Db = 17 in.,    Dc = 34 in.,    Dd = 33 in.

Basic assumptions: 1) The front and rear provision pairs are symmetrical about the longi- tudinal centerline of the equipment, and 2) The vertical CG is on a plane containing all provisions, referred to as the "plane of the provisions." These assumptions are made merely to simplify the load calculations. The second assumption in no way negates the location requirements of paragraph 4.1.2.2. For stability reasons, the lift provisions should be located above the vertical CG, per paragraph 5.1.2.g.

B.5.1.1 Determine �, the angle of the plane of the provisions with respect to the horizontal,

and L  .

r  - Hf  = d = 33 - 24 = 9 inches

L = L + L

= 56 + 79 = 135 inches

If  TAN(�)= d!L then �=TAN-1(d!L)

�=TAN-1(d!L)=3.8°

COS(�)=L/Lxy   ⇒  Lxy=L/COS(�)

xy= 135/COS(3.8°) = 135.3 inches

Source:  https://assist.dla.mil  --  DBow-5nloaded:  2014-09-28T23:10Z Check  the  source  to  verify  that  this  is  the  current  version  before  use.