TM 55-1680-358-12 & P CHAPTER 3 MAINTENANCE INSTRUCTIONS SECTION I.  GENERAL 3-1.  General.  The Helicopter Internal Cargo Handling System     does     not     require     scheduled     service     and maintenance.    However,  it  must  always  be  inspected prior  to  use,  after  storage,  after  extended  periods  of non-use, etc., to make certain that the system functions correctly.  These instructions are provided in paragraph 3-4. SECTION II.  MAINTENANCE 3-2.    Periodic  Lubrication.    Normally  the  Helicopter Internal   Cargo   Handling   System   requires   no   periodic lubrication.      However,   if   the   cargo   system   has   been used under extreme environmental conditions, assemblies  with  close-fitting  parts  may  function  more efficiently if a dry lubricant is used (Specification MIL-L- 46147, NSN 9150-00168-2000). WARNING Provide adequate ventilation when using cleaning solvent (Federal Specification P-D-680. Avoid     prolonged     breathing     of vapors and minimize skin contact. CAUTION Do  not  use  cleaning  solvent  P-D- 680 on rollers. 3-3.  Cleaning.  The Helicopter Internal Cargo Handling System  must  be  kept  clean.    It  may  be  hosed  down. Remove sand, dust, and dirt from all operating parts.  If hosing down is not adequate, use dry cleaning solvent, Specification P-D-680, on all components EXCEPT ALL ROLLERS. 3-4.  Inspection.  Inspect the system as follows: a. Intervals.      The Helicopter Internal Cargo Handling   System   should   be   inspected   prior   to   each cargo  mission  or  when  any  of  the  following  events  has or will occur. (1) A   new   cargo   handling   system   has   just been installed. (2) A  cargo  system  has  been  removed  from storage and installed. (3) A   system   has   been   idle   in   an   out-of- service aircraft. (4) Maintenance has recently been performed and the system has not been inspected. (5) A system appears to function improperly. b. Inspection Criteria.   A general inspection should be accomplished for any one of the reasons indicated in paragraph  3-4a.    Inspection  also  helps  to  maintain  the Helicopter   Internal   Cargo   Handling   System   in   good working  condition.    Refer  to  Table  2-1.    Make  certain that all components shown in the table are accounted for in either the installed or stowed locations as applicable. After this has been accomplished, inspect the Helicopter Internal Cargo Handling System against the illustrations (Figures 2-1 through 2-15).  Make certain that all cargo system    components    are    properly    installed.        Check outboard    rail/roller    assemblies,    stations    158.500    to 274.000   (1   and   2,   Figure   3-2);   stations   272.531   to 374.000  (3  and  4);  stations  373.469  to  487.000  (5  and 6);  left-hand  ramp  guide  rail/roller  assembly  (7);  right- hand    ramp    guide    rail/roller    assembly    (8);    inboard guide/roller assemblies, stations 157.750 to 272.188 (9); stations  272.313  to  377.188  (10);  stations  377.313  to 427.188 (11); and stations 427.375 to 487.000 (12); left- hand inboard ramp 3-1