Table 5-2. Application of Material for Tiedown of the M9 ACE on the M870 Semitrailer (Fig 5-2)

T M 5 5 - 2 3 5 0 - 2 6 2 - 1 4 (2) The H-frame shoring should be installed raised to the travel position by using the truck- between the tracks, as shown in figure 5–1. tractor winch cable, and the semitrailer must be (3) The vehicle should be parked, with the connected to the M920 truck tractor. brake set, as shown in figure 5-2. The dozer blade (5) Data for the application of material re- should be lowered to the floor of the trailer. quired to restrain the vehicle are provided in table (4) The M870 semitrailer gooseneck must be 5-2. Table 5-1. Bill of Materials for Blocking and Tiedown of the M9 ACE on the M870 Semitrailer Approximate Item Description Quantity Lumber Douglas-fir, or comparable, straight grain, free from material defects; Fed 65 linear feet Spec MM-L-751H: 2- x 4-inch Wire rope* 6 x 19, IWRC: improved plow steel; preformed regular-lay; table X, Fed Spec 90 feet R-W-410: 5/8-inch Clamps* Wire rope, U-bolt clips, saddled, single-grip, steel, Crosby heavy-duty, or 24 equal; MIL-STD 16842 5/8-inch Thimbles Standard, open-type: 5/8-inch 8 Nails Common, steel; flathead, bright or cement-coated; para 3.6.11.2 Fed Spec 100 FF-N-105B: 12D (3-1/4-inch) *Suitable capacity chains and load binders may be substituted for 5/8-inch wire rope and clamps. Table 5-2. Application of Material for Tiedown of the M9 ACE on the M870 Semitrailer (Fig 5-2) Item No. Required Application A 2 Side blocking, 2- x 4- x 120-inch lumber (doubled). Pre-position. Nail first piece to trailer floor with one 12d nail every 8 inches. Nail second piece to first in a like manner. B 2 Lateral bracing, 2- x 4-inch x length-cut-to-fit lumber (doubled). Pre-position. Nail first piece to trailer floor with one 12d nail every 8 inches. Nail second piece to first in a like manner. C, D,E,F 8 Thimble, open-type, 5/8-inch. Place one on each M9 ACE tiedown (front and back) and on each semitrailer outside tiedown ring to be used. C,D,E,F 4 Wire rope, 5/8-inch. Attach, in a complete loop, through thimbles on the vehi- cle tiedown and through the thimbles on the semitrailer outside tiedown rings on the same side. 24 Clamp, 5/8-inch. secure the ends of the wire rope with four clamps each. Se- cure the thimbles with one clamp each. 5-2