aboard ship to identify material and provide informationon how much of what material to stock aboard ship. TheCOSAL is generated directly from the ship’sconfiguration baseline, which lists all systems,equipments, and components aboard ship. Therefore,you must maintain the ship’s configuration baseline inthe ICP file from which the COSAL is generated. Otherlogistics support also depends on the accuracy of thisconfiguration baseline. Some examples are technicalmanuals, planned maintenance, and test equipmentallowances. Ship personnel are responsible for themaintenance and accuracy of the configuration baseline.OPNAVINST 4790.4 explains how to report changes inthe ship’s configuration baseline. Use the sameinstruction to report any errors in the COSAL. Someexamples are APL still in COSAL for equipment thathas been removed, equipment on board but notsupported by an APL, nameplate data in the APL doesnot agree with that represented by the actual equipmentconfiguration, and so forth.Supply PublicationsWhen you submit a requisition for supplies, it setsin motion a long chain of events involving procurementactions, movement of material, and maintenance ofstock records. You must submit accurate data if youexpect to get the supplies you requested. Refer to thefollowing sources for accurate information.MANAGEMENT LIST NAVY.– The ML-N is amicrofiche aid that contains basic management data youneed to prepare requisitions. The ML-N contains stocknumber changes, units of issue, unit price, andassociated information (fig. 5-6).MASTER CROSS-REFERENCE LIST(MCRL).– The MCRL is a cross-reference from areference number (manufacturer’s part number, adrawing number, design control number, and so forth)to its assigned NSN and from its NSN to its referencenumber. The format of the MCRL is shown in figure 5-7.The column titled Mfr. Code shows the federal stockcode for manufacturers (FSCM), which is theidentification numbers for each manufacturer doingbusiness with DOD. You need the FSCM because somemanufacturers will sometimes assign identicalreference numbers.MASTER REPAIRABLE ITEM LIST(MRIL).– The MRIL helps identify Navy-managed,mandatory, turn-in repairable items; turn-in activities ofrepairable items; and pertinent movement prioritydesignators. The MRIL is published in microfiche by thefleet material support office (FMSO) and is distributedeach month. The introduction to MRIL, NAVSUP P4000, chapter 5, is included in microfiche in the January,April, July, and October editions of the MRIL.AFLOAT SHOPPING GUIDE (ASG).– The ASGhelps you identify items of supply not normally relatedto a part or reference number by relating them to anNSN. It also helps find substitutions in the generalhardware area through the use of illustrations,specifications, and narrative descriptions from whichyou may locate the applicable NSN. Sections of the ASGare republished when the volume of changes issignificant.IDENTIFICATION LISTS (ILs).– The ILs aremicrofiche listings by group and class that provide itemdescriptions and related data required to identify orselect items of supply.Other Sources of IdentificationThere will be times when a repair part is not listedin an APL. This may happen when the equipment orcomponent is not supported or when the part has beenomitted. Keep in mind that an APL may cover acomplete equipment or only a component of anequipment. Therefore, check the index to see if the partyou need is included in another APL. For example,couplings, switches, and valves may be listed in theAPLs for the components with which they are used oreach may be assigned a CID number and have its ownAPL.To identify a repair part in sources other than theCOSAL, you must have complete information on theequipment. Several sources of this information aredescribed in the next paragraphs.NAMEPLATES.– One of the most importantsources of information is the data shown on equipmentnameplates. This may include the manufacturer’s name,model or type, serial number, size or capacity, voltage,and so forth.TECHNICAL MANUALS.– Technical manualsand instruction books published by the equipmentmanufacturer usually contain a complete description ofthe equipment as well as parts lists that relate the part toa manufacturer’s part number.BLUEPRINTS AND DRAWINGS.– Installationand maintenance blueprints and drawings also containhelpful identifying information.5-13
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