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personnel. Thus, they are able to schedule routine
maintenance
f o r
u n d e r w a y o r
inport
periods-whichever is the best time to accomplish the
maintenance.
OPNAVINST 4790.4 contains thorough coverage
of the 3-M Systems from a maintenance management
point of view. The 3-M systems also includes material
management by providing information as to how the
Navy is using both its material and man-power.
MAINTENANCE DATA SYSTEM
The Maintenance Data System (MDS) provides a
means of recording information on maintenance actions
that have been taken. Each action is documented on a
Maintenance Data Form.
Any data collection system must have some means
of sorting and classifying information. If you were
handed a stack of stock record cards and told to sort
them, you would also have to be told what kind of a sort
was needed before you could proceed. These sorts
include putting them in national stock number (NSN)
or national item identification number (NIIN)
sequence; separating them by cognizance or location;
removing all cards with excess stock or removing all
cards showing outstanding requisitions. Certain items
of information that must be shown on the OPNAV Form
4790/2K and on issue documents provide this means of
classification.
All material that is consumed in support of a
maintenance action must be reported. In most cases,
repair parts will be drawn from supply storerooms or
ordered through supply. The request documents must
contain all data elements necessary for MDS
processing. Figure 12-1 shows a NAVSUP Form
1250-1 used for this purpose. The various elements of
MDS data are explained in OPNAVINST 4790.4.
SUPPLY RESPONSIBILITY FOR MDS
Supply responsibilities for the proper functioning
of the 3-M systems involve:
1. Issuing the material required to accomplish the
necessary maintenance actions, and
2. Making sure that issue documents are correctly
prepared.
The Supply Support Center (SSC) is the logical
place to make sure that the request document is
completely and accurately prepared. The SSC is the
first to receive requests submitted by maintenance
department representatives. It is far better to require
complete data when the request is received than to make
an issue on an incomplete document and then try to
obtain the missing information.
The issue documents, DD Form 1348 or NAVSUP
Form 1250-1, have previously been discussed as they
pertained to material expenditure. See figure 12-2.
Equipment Identification Code
The equipment identification code (EIC) is a
seven-digit alphanumeric code that identifies a specific
Figure 12-1.-MDS on NAVSUP Form 1250-1.
12-2
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