ARMY TM 5-5420-212-10-1 MARINE CORPS TM 08676A-10/1-1 TABLE 3-7.  SS Bridges 4 through 8 bays TABLE 3-8.  SS Bridges 9 through 12 bays Site and Bridge Dimensions Site and Bridge Dimensions AR Gap No. Brg Nose AR Gap No. Brg Nose of of Ranges MLC* Bays Lgth R Dist Const Ranges MLC* Bays Lgth R Dist Const (a) (b) (c) (d) (e) (f) (a) (b) (c) (d) (e) (f) 3.7 - 7.1 70(T) 4 7.9 5.8 12.9 - 16.3 24 9 17.1 10.4 5N1 5.6 - 9.0 70(T) 5 9.8 6.7 14.7 - 18.1 20 10 18.9 12.2 5N1 7-4 - 10.8 40 6 11.6 7.6 LLN 16.5 - 19.9 16 11 20.7 12.2 6N1 9.2 - 12.6 30 7 13.4 9.5 ONLY 18.4 - 21.8 16 12 22.6 14.0 6N1 11.0 - 14.4 30 8 15.2 11.3 * - See step k.  Slope Check and Table 1-1 forcrossing restrictions and MLC 100(W) capability.  (T) = Tracked c. Bridge length Read and note the number of bays and bridge length, Table 3-7 and 3-8 columns (c) and (d). d. R Distance Read and note the R Distance, Table 3-7 and 3-8 column (e). e. Nose construction Read and note the nose configuration, Table 3-7 and 3-8 column (f). f. Key construction points Identify, locate, and take elevations at the key construction points.  These construction points are explained below and shown in Figures 3-7 and 3-8 (1) F  peg-Designates  the  location  of  the  far  bank  end  of  bridge  (outer  edges  of  bankseat  beam).    Initially placed 0.4m (minimum acceptable) from the A peg on the far bank.  This 0.4m, between the A and F pegs is the amount of bridge that will bear on the far bank, and is known as the far bank bearing. (2) A peg-Edge of firm ground on the far bank. (3) A’ peg-Edge of firm ground on the near bank. (4) AR Gap-The distance measured between the A and A’ pegs.  This is the actual gap to be spanned by your bridge. (5) F’  peg-Designates  the  location  of  the  near  bank  end  of  bridge  (outer  edge  of  bankseat  beam).    The distance (determined later), from the A’to F' peg is the amount of bridge that will bear on the near bank, known as the near bank bearing. The minimum acceptable near bank bearing is 0.4 m. (6) RB  peg-Designates  the  position  of  the  roller  beam  (RB).    It  may  be  in  one  of  two  different  positions depending upon the launch method used, push launch (4 or 5 bays) or jack launch (4 through 12 bays). NOTE Push launches are to be performed only when it Is operationaly necessary (see Chap.  5, Sect.  I, para.  b).  Push launches are no longer performed for training or demonstration purposes. (a) Push launch.  The distance X to the RB peg is calculated by using the position of the A' peg on the near bank, bridge length (L), AR Gap, minimum bearing requirement (0.4 m), and the approximate 3-19