aboard ship to identify material and provide information on how much of what material to stock aboard ship. The COSAL  is  generated  directly  from  the  ship’s configuration  baseline,  which  lists  all  systems, equipments,  and  components  aboard  ship.  Therefore, you must maintain the ship’s configuration baseline in the ICP file from which the COSAL is generated. Other logistics  support  also  depends  on  the  accuracy  of  this configuration baseline. Some examples are technical manuals, planned maintenance, and test equipment allowances.  Ship  personnel  are  responsible  for  the maintenance and accuracy of the configuration baseline. OPNAVINST 4790.4 explains how to report changes in the   ship’s   configuration   baseline.   Use   the   same instruction to report any errors in the COSAL. Some examples  are  APL  still  in  COSAL  for  equipment  that has  been  removed,  equipment  on  board  but  not supported by an APL, nameplate data in the APL does not agree with that represented by the actual equipment configuration, and so forth. Supply Publications When you submit a requisition for supplies, it sets in motion a long chain of events involving procurement actions, movement of material, and maintenance of stock records. You must submit accurate data if you expect  to  get  the  supplies  you  requested.  Refer  to  the following  sources  for  accurate  information. MANAGEMENT LIST NAVY.–  The ML-N is a microfiche aid that contains basic management data you need to prepare requisitions. The ML-N contains stock number   changes,   units   of   issue,   unit   price,   and associated  information  (fig.  5-6). MASTER    CROSS-REFERENCE    LIST (MCRL).–  The  MCRL  is  a  cross-reference  from  a reference  number  (manufacturer’s  part  number,  a drawing number, design control number, and so forth) to its assigned NSN and from its NSN to its reference number. The format of the MCRL is shown in figure 5-7. The column titled Mfr. Code shows the federal stock code   for   manufacturers   (FSCM),   which   is   the identification numbers for each manufacturer doing business with DOD. You need the FSCM because some manufacturers   will   sometimes   assign   identical reference  numbers. MASTER   REPAIRABLE   ITEM   LIST (MRIL).– The MRIL helps identify Navy-managed, mandatory, turn-in repairable items; turn-in activities of repairable  items;  and  pertinent  movement  priority designators. The MRIL is published in microfiche by the fleet material support office (FMSO) and is distributed each month. The introduction to MRIL, NAVSUP P 4000, chapter 5, is included in microfiche in the January, April, July, and October editions of the MRIL. AFLOAT SHOPPING GUIDE (ASG).– The ASG helps you identify items of supply not normally related to a part or reference number by relating them to an NSN. It also helps find substitutions in the general hardware   area   through   the   use   of   illustrations, specifications,  and  narrative  descriptions  from  which you may locate the applicable NSN. Sections of the ASG are  republished  when  the  volume  of  changes  is significant. IDENTIFICATION LISTS (ILs).– The ILs are microfiche listings by group and class that provide item descriptions and related data required to identify or select items of supply. Other Sources of Identification There will be times when a repair part is not listed in an APL. This may happen when the equipment or component is not supported or when the part has been omitted.  Keep  in  mind  that  an  APL  may  cover  a complete   equipment   or   only   a   component   of   an equipment. Therefore, check the index to see if the part you need is included in another APL. For example, couplings, switches, and valves may be listed in the APLs for the components with which they are used or each may be assigned a CID number and have its own APL. To identify a repair part in sources other than the COSAL, you must have complete information on the equipment.  Several  sources  of  this  information  are described in the next paragraphs. NAMEPLATES.–  One  of  the  most  important sources of information is the data shown on equipment nameplates. This may include the manufacturer’s name, model or type, serial number, size or capacity, voltage, and so forth. TECHNICAL MANUALS.– Technical manuals and  instruction  books  published  by  the  equipment manufacturer  usually  contain  a  complete  description  of the equipment as well as parts lists that relate the part to a manufacturer’s part number. BLUEPRINTS AND DRAWINGS.– Installation and  maintenance  blueprints  and  drawings  also  contain helpful  identifying  information. 5-13