TM 55-1680-358-12&P SECTION II.  INSPECTING AND SERVICING THE EQUIPMENT 2-4.    Inspection.      Inspect   the   system   components   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    2-4a.        Inspect    regularly    to    maintain    the Helicopter    Internal    Cargo    Handling    System    in    good working   condition.      Make   certain   that   all   components shown in the table are accounted for in either the installed or  stowed  locations  as  applicable.    (Refer  to  Table  2-1.) Then inspect the system against Figures 2-4 through 2-21 to  make  certain  that  all  system  components  are  properly installed.        Check    outboard    rail/roller    assemblies    (1 through 6, Figure 3-2), inboard guide/roller assemblies (9 through  12),  inboard  ramp/roller  assemblies  (13  and  14), ramp   guide   rail/roller   assemblies   (7   and   8),   and   ramp extension  roller  assembly  (15)  for  cracks  or  breaks.    No cracks or breaks are allowed. 2-5.   Service.    No  pre-installation  service  is  required  for the Helicopter Internal Cargo Handling System. SECTION III.  INSTALLATION 2-6.      Tools   Required.      Table   2-3   provides   a   list   of common  tools  required  to  install  the  Helicopter  Internal Cargo  Handling  System  plus  two  special  tools  provided with the system. NOTE Refer to Table 3-2 for standard installation torque values. Table 2-3.  Tools Required for Installation Tool Description Quantity C-clamp 6 Inch Throat 2 3/8 Inch 12 Point Socket 1 7/16 Inch 6 Point Socket 1 9/16 Inch 6 Point Socket 1 Number Three Phillips Drive 3/8 Inch 1 Square Drive Socket Bit Number     Four     Phillips     Drive     3/8     Inch Square 1 Drive Socket Bit or Screwdriver 7/32    Inch    Hex    Drive    (Allen)    3/8    Inch Square 1 Drive Socket Bit (*) 9/16 Inch Open End/Box End 1 3/4 Inch Open End/Box End 1 3/4 Inch Socket 1 X Drill (0.397 Diameter) 1 B 18049 140-MDF Master Drill Fixture (*) 1 * AAR Brooks & Perkins supplies these items as installa- tion aids even though the system can be installed without the use of these items. 2-3