TM 55-1680-358-12&P (f)    Attach  outboard  rail/roller  assemblies,  stations 373.469  to  487.000  (5  and  6,  Figure  3-2)  to  10k  fitting assemblies (22) at stations 400.00 and 481.780.  Refer to Figures 2-5 and 2-6). NOTE Due   to   possible   irregularities   in   aircraft, pallet, and/or cargo system, the main deck outboard   rails   may   have   less   than   the required lateral spacing which must be not less   than   88.00   inches.      Use   spacers   in pairs  where  relief  is  necessary  in  order  to maintain    required    separation,    i.e.,    one spacer should be used on either side when required.  Do not use two spacers together on a side.  Use of more than one shim at a location     can     jeopardize     adequate     grip length  of  the  10k  fitting  and  outboard  rail attachment bolts and is not permissible. (g)    Measure  lateral  spacing  of  outboard  rails  at (stations 240.000, 320.000, 400.000, 481.78).  If spacing is less than the required 88.00 inches, a 0.060 inch thick spacer  (P/N  18049C545)  is  to  be  inserted  between  the 10k  fitting  and  the  outboard  rail  to  maintain  required  rail clearance. (h)      Make   splice   connections   between   outboard rail/roller assemblies, stations 158.500 to 274.000 (1 and 2, Figure 3-2), and rail/roller assemblies, stations 272.531 to 374.000 (3 and 4) on both left and right sides.  Use two hex   head   bolts   (29)   and   flat   washers   (43)   per   splice. Refer to Figure 2-7. (i)      Make   splice   connections   between   outboard rail/roller assemblies, stations 272.531 to 374.000 (3 and 4) and rail/roller assemblies, stations 373.469 to 487.000 (5 and 6), on both left and right sides.  Use two hex head bolts   (29)   and   flat   washers   (43)   per   splice.      Refer   to Figure 2-7. (j)  If floor patches cause interference problems with outboard  rail/roller  assemblies  (1  through  6,  Figure  3-2), modify   as   follows.      Mark   the   area   on   the   rail/roller assembly.      Remove   rail/roller   assembly.      Machine   or relieve    the    area    as    necessary    to    ensure    adequate clearance  of  rail/roller  assembly  and  patched  area.    In modified  area,  remove  all  sharp  edges.    Have  0.13  inch (approximate)  radii  where  needed  (Figure  2-8).    Repaint as specified in Chapter 3. (k)  Connect twenty-six floor-mounted tiedown rings in   the   helicopter   to   the   outboard   rail/roller   assemblies, stations    158.500    to    274.000    (1    and    2,    Figure    3-2) outboard     rail/roller     assemblies,     stations     272.531     to 374.000  (3  and  4),  and  outboard  rail/roller  assemblies, stations  373.469  to  487.000  (5  and  6).    Use  5k  tiedown fitting  assemblies  (21).    There  are  thirteen  symmetrical locations per side.  Refer to Figure 2-9 for details. CAUTION Ensure   conical   washer   (6,   Figure   3-16) has  flat  down  when  installing  5k  tiedown fitting  assembly  (21,  Figure  3-2).    (See Figure 2-9 for correct position). CAUTION At   station   360.000,   use   tiedown   fitting assembly, station 360.000 (23) and not 5k tiedown    fitting    assembly    (21).        (See Figure  2-10.)  Tiedown  washer  (1,  Figure 3-18) should have the flat down. (1)  Connect two floor-mounted tiedown rings on the left and right sides at station 360.000 (23, Figure 3- 2)  to  outboard  rail/roller  assemblies,  stations  272.531  to 374.000 (3 and 4).  Use tiedown fitting assemblies, station 360.000 (23) as shown in Figure 2-10. c.  Inboard Guide/Roller Assembly.  Install inboard guide/roller   assembly,   stations   157.750   to   272.188   (9, Figure     3-2);     inboard     guide/roller     assembly,     stations 272.313  to  377.188  (10);  inboard  guide/roller  assembly, stations 377.313 to 427.188 (11); and inboard guide/roller assembly, stations 427.375 to 487.000 (12) as follows: (1)      Position   inboard   guide/roller   assembly, station 157.750 to 272.188 (9) on B.L.  0.000.  Make sure the forward end is aligned at station 157.750 as shown in Figure 2-11. (2)      Connect   three   tiedown   assemblies   (9 through  16,  Figure  3-7),  as  shown  in  Figure  2-11,  to  5k tiedown rings on the helicopter floor.  Use centerline ring plug assemblies (24, Figure 3-2). (3)      Position   inboard   guide/roller   assembly, stations  272.313  to  377.188  (10)  on  B.L.  0.000  directly behind inboard guide/roller assembly, stations 157.750 to 272.188 (9). (4)      Connect   three   tiedown   assemblies   (45 through  60,  Figure  3-8),  as  shown  in  Figure  2-11,  to  5k tiedown    fitting    assemblies    (21,    Figure    3-2)    on    the helicopter floor.  Use centerline ring plug assemblies (24). (5)      Position   inboard   guide/roller   assembly, stations  377.313  to  427.188  (11)  on  B.L.  0.000  directly behind inboard guide/roller assembly, stations 272.313 to 377.188 (10). Change 1 2-11