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

The same equation can be applied to the other provisions.

COS(�) = hb/hbt   ;  hbt  = hb/COS(�) = 58.5/COS(3.80) = 58.6 inches COS(�) = hc/hct   ;  hct  = hc/COS(�) = 86.0/COS(3.80) = 86.2 inches COS(�) = hd/hdt   ;  hdt  = hd/COS(�) = 85.6/COS(3.80) = 85.8 inches

K2  = S2 + h

2 - 2Sh

COS(SA)

at                  at

K =  √S2  + h

2  - 2Sh

COS(SA)

at                   at

K =  √1442  + 58.32  - 2(144)(58.3)COS(59.7°)   =  125.2 inches

B.5.1.4 Determine VA, the angle of the slings with the vertical when the equipment is lifted.

h  2  = S2  + K2 - 2SKCOS(VA )

at                                                                     a

VA  = COS-1((S2 + K2 - h

2)/2SK)

VA  =  COS-1((1442 + 125.22 - 58.32)/2(144)(125.2)) = 23.70

VA  = COS-1((S2  + K2  - h

2)/2SK)

VA  =  COS-1((1442 + 125.22 - 58.62)/2(144)(125.2)) = 23.90

VA  = COS-1((S2 + K2 - h

2)/2SK)

VA  = COS-1((1442 + 125.22 - 86.22)/2(144)(125.2)) = 36.50

VA  = COS-1((S2 + K2  - h

2)/2SK)

VA  = COS-1((1442 + 125.22 - 85.82)/2(144)(125.2)) = 36.30

B.5.1.5 Determine the vertical force component, V, at each provision.

Based on the assumption that the CG lies on the plane of the provisions, the horizontal distance between the provisions and the vertical axis of the CG when the equipment is

Source:  https://assist.dla.mil  --  DBow-9nloaded:  2014-09-28T23:10Z Check  the  source  to  verify  that  this  is  the  current  version  before  use.

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