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 ships
configuration baseline, which lists all systems,
equipments, and components aboard ship. Therefore,
you must maintain the ships 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 ships 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.
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 (manufacturers 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
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
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
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 manufacturers 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 manufacturers part number.
BLUEPRINTS AND DRAWINGS. Installation
and maintenance blueprints and drawings also contain
helpful identifying information.