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

hL = √Dab

+ (L   - L )2

y              ab

2              2

cd             xy

2L

2          16.52 -  33.52  + 135.32

=

2(135.3)

= 64.5 inches

xy

And then solve for L

and h .

x          xy

= 135.3 - 64.5 = 70.8 inches

hL  = √Dab    + L

=  √16.52

+ 70.82

= 72.7 inches

x

SA is set to 450 to determine the sling length for a single apex sling assembly.

COS(450) = hL/S;  S = hL/COS(450) = 72.7/.707 = 102.8 inches = 8.6 feet

Since S is shorter than 12 feet, the sling leg length for an equal length single apex sling assembly is set to 12 feet. This is most likely the shortest size of slings that will be available in the field to lift an item. If S had been greater than 12 feet, then the calculated value of S would be used from this point forward to complete the calculations.

For your piece of equipment, if the calculated sling lengths result in interference between the vehicle and slings when the vehicle is lifted, the angle of the slings will be verified at the test site prior to testing. This verfication will ensure that a 45° angle is achieved between the slings and the surface of the vehicle or equipment (see paragraph

5.1.2). Adjustment to the slings lengths may be required if the sling angles are smaller than

45°.

∴ S = 12 feet = 144 inches for all slings

and COS(SA) = h /S;  SA = COS-1(h /S)  = COS-1(72.7/144) = 59.70

L                                                 L

Source:  https://assist.dla.mil  --  DBow-7nloaded:  2014-09-28T23:10Z Check  the  source  to  verify  that  this  is  the  current  version  before  use.

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