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

B.5.1.11. When the resulting length of slings using the method described previously in this appendix causes interference between the equipment and the slings when the equipment is lifted, the sling lengths to use for the test can be determined as follows:

1)  Determine the point of interference on the equipment.

2)  Determine the length of sling between the provision and the point of interference.

3)  Using a 45° degree sling angle (measured from the horizontal when the equipment

is resting on a level surface), determine the length of sling from the point of interfence to a vertical line running through the location of the longitudinal and lateral CG.

4)  Add #2 and #3 together.

5) If #4 is less than 12 feet, then set the sling length at 12 feet for the test.  If #4 is 12 feet or more, use this length as the test sling length.

6) If there is interference in more than one location, use the above method to determine the test sling lengths for each location and then use the longest resulting sling length as the test sling length. All slings will be the same length for the test.

Source:  https://assist.dla.mil  --  DBow-1nl3oaded:  2014-09-28T23:10Z Check  the  source  to  verify  that  this  is  the  current  version  before  use.