TM 55-1680-358-12&P 2-13.      Loading   Sequence.      Following   are   loading sequences  for  the  Helicopter  Internal  Cargo  Handling System. a.    463L  Pallets.    Refer  to  Table  2-6  to  select  the proper    configuration    for    cargo    system    components during  loading.    Up  to  three  pallets  may  be  winched  or manually loaded on the system.  Loading configurations and clearances are shown in Figures 2-29, 2-30 and 2- 31. b.    Warehouse  Pallets.      Following   is   the   loading sequence for the warehouse pallets. (1)      Refer   to   Table   2-6   to   select   the   proper configuration   for   Helicopter   Internal   Cargo   Handling System   components   during   loading.      Up   to   8   to   10 warehouse   pallets   can   be   loaded   into   the   helicopter. However,    weight    and    center-of-gravity    requirements must   be   within   the   limits   specified   in   paragraph   2- 13b.(2).    The  40-inch  side  should  be  positioned  across the  handling  system  so  that  the  48-inch  side  is  on  the ramp   guide   rail   (12,   Figure   3-6).      Pallets   may   be winched or manually loaded.  During loading, the pallet should    be    forklifted    onto    the    ramp    extension    and balanced  onto  the  outboard  roller  (1).    On  the  ramp,  it should be pushed outboard. (2)  Individual warehouse pallets may weigh up to  3,700  pounds.    However,  in  order  to  maintain  floor isolation,    the    sum    of    the    weights    of    longitudinally adjacent  pallets  must  not  exceed  4,300  pounds.    For example, pallets weighing 2,150 pounds or less may be loaded    without    discrimination.        A    mix    of    pallets weighing,  for  example,  3,000  and  1,200  pounds,  would require  alternate  loading  of  a  3,000  pound  pallet  and  a 1,200   pound   pallet.      If   the   load   consists   entirely   of pallets  weighing  in  excess  of  2,150  pounds,  the  pallets must be spaced longitudinally.  The distance, in inches, between the forward edge of one pallet and the forward edge  of  the  subsequent  pallet  must  not  be  less  than W/45.2  when  W  is  the  average  pallet  load  in  pounds. For  example,  a  load  of  pallets  weighing  3,000  pounds each  would  need  to  be  spaced  3000/45.2  =  66  inches center    to    center    apart.        Pallets    that    are    spaced longitudinally    will    require    tiedowns    for    longitudinal, lateral and vertical forces.  In this situation, there is no requirement to use a barrier system. c.  Wheeled Vehicles.  Refer to Table 2-7 to select the  proper  configuration  for  system  components  during loading.    Winch  or  manually  load  the  vehicles  into  the helicopter.  For specific procedures, refer to TM-55-450- 18,  Internal  and  External  Loads,  CH47  Helicopter  HQ DA, August 1970. d.        Personnel.        The    Helicopter    Internal    Cargo Handling System is compatible for personnel only or for both cargo and personnel.  If both are loaded, the cargo must be forward of the personnel for safety. e.  Miscellaneous Cargo.    Place  on  a  pallet  or  skid as desired.  If a 6/E Pallet is used, secure the pallet with pallet lock assemblies (62, Figure 3-3 and 30, Figure 3- 4)   or   retractable   flange   assemblies   (43,   Figure   3-5). Straps or chains may be used as required. f.  Mixed Cargo.  Any of the previous cargos may be mixed as desired.  The only limitation is space. 2-14.  Hatch Access.  Follow these instructions to gain access to the hatch. a.      Remove,   if   necessary,   any   cargo   forward   of station 377.250 to at least station 157.750. b.    Remove  three  centerline  ring  plug  assemblies (24,  Figure  3-2).    This  will  free  the  inboard  guide/roller assembly, stations 377.313 to 427.188 (11, Figure 3-2). Stow   the   removed   parts   ahead   of   station   272.250 (Figure 2-32). c.  The hatch is now accessible.  The removed parts can be re-installed by reversing the preceding steps. 2-15.        Ferry    Fuel    Port    Access.        Follow    these instructions to gain access to the ferry fuel port. a.  Remove two hex head bolts (29, Figure 3-2) and two    washers    (43)    from    the    aft    side    of    the    splice connection at station 373.437. b.    Refer  to  Figure  2-28  and  remove  5k  tiedown fitting  assemblies  (21,  Figure  3-2)  located  at  stations 380.000,  420.000,  440.000  and  460.000  as  shown  in Figure 2-33. c.  Refer to Figure 2-6 and remove hex head bolts (28, Figure 3-2) and washers (42, Figure 3-2) at stations 400.000  and  481.780  (Figure  2-33).    They  secure  the 10k  fitting  assembly  (22,  Figure  3-2)  to  the  outboard rail/roller assembly, stations 373.469 to 487.000 (6). d.    Stow  all  of  the  removed  parts  and  relocate  the outboard     rail/roller     assembly,     stations     373.469     to 487.000 (6, Figure 3-2), to the center of the helicopter. e.      Reverse   the   above   procedure   to   install   the outboard     rail/roller     assembly,     stations     373.469     to 487.000 (6). 2-49