In block 18, the first two letters identify SHIPALT (SA), ORDALT (OA), field change (FC), or any other appropriate instruction. Electronic equipment is always identified by serial number, and only one piece of equipment may be reported under a given JCN. If several pieces of the same type of equipment are altered by field changes, there must be one document for each piece of equipment. Example: A ship has four C-13 Mod 1 catapults, and field change 17 is to be installed in all of them. Each catapult will be changed, and the changes will be reported on separate documents   showing   a   specific   JSN   and   equipment serial   number.   This   will   enable   the   computers   to identify which items of equipment have been changed and  which  have  not.  It  also  will  be  reflected  on  the readouts  returned  to  the  ship  as  part  of  its  material history. Another  problem  is  the  use  of  the  noun  name  in block 5. For electronic equipment the "AN" designation is the best entry for the noun name. If there is no "AN" designation, the name from the nameplate should be used. Up to 16 characters of a name may be entered. In block 35, a space follows each word, and words that cannot be completed on a line are continued on the next   line   with   no   spaces   or   hyphens   inserted.   On deferred actions, the XXX's used to separate the trouble from    the    desired    corrective    action    must    not    be separated. If they cannot be fitted in on one line, extra spaces will be left blank on that line and the XXX's will be put in the first spaces of the next line. REVIEW QUESTIONS Q7. Maintenance Data System is used to record what type of information? Q8. Under the maintenance Data System, what is a Job Control Number? Q9. What is the OPNAV 4790/2K used to report? Q10. The  OPNAV  4790/2P  provide  what  type  of information? SUPPLY LEARNING  OBJECTIVES:  Recognize  the different  types  of  stock  and  control  numbers. Recall   the   purpose   of   cognizance   symbols. Recognize   sources   of   identifying   material when a stock number is not available. Recognize  the  uses  of  the  following  supply publications:    FED    LOG,    ML–C,    MCRL, MRIL, ASG, and GSA. One  of  the  duties  of  an  ABE  is  to  identify  and requisition    material.    This    section    provides    basic information  to  help  you  develop  the  knowledge  you need to perform these duties. Proper material identification   is   essential   to   the   requisitioning   and receipt  of  the  correct  item.  You  must  understand  the terminology used in material identification. GENERAL INFORMATION Material is managed according to category (Federal  Supply  Classification)  and  its  intended  use. An inventory manager is assigned for each category of material,  and  has  overall  responsibility  for  all  items within the category. All items in the supply system have an   assigned   two-position   cognizance   symbol   code. This  code  identifies  the  inventory  manager  and  the stores  account  in  which  the  material  is  carried.  The items assigned to bureau, office, or systems command for   inventory   management   includes   the   following material:   Material in the research and development stage   Material    that    requires    continuing    logistics, engineering, or fiscal administration and control at the department level.   Material  recognized  as  a  onetime  installation that was bought and issued for a specific use Naval Supply System Command (NAVSUP) Inventory Control point (ICP) items are those for which bureau, office, or systems command management is not essential.  The  NAVSUP  ICP  provides  stocks  of  these items to its segment of the supply system. This group of items includes equipment, repair parts, and consumables.  It  also  includes  those  items  for  which stocking  determination,  quality  control,  funding,  and issue   control   can   be   accomplished   by   the   ICP   if required, the ICP ensure that these items are available from    commercial    sources    and    other    government agencies.  NAVSUP  selects  the  items  assigned  to  ICP for   inventory   management   with   the   advice   of   the appropriate bureau, office, or systems command. The Navy Retail Office items are items for which joint   military   supply   management   responsibility   is vested to the Defense Logistics Agency (DLA). These items  include  components,  repair  parts,  consumables, and other material. The requirement determination and procurement of these items can be accomplished by the 7-29