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TM10-3930-628-12
APPENDIX B
MAINTENANCE ALLOCATION CHART
Section I. INTRODUCTION
elements, such as painting and lubricating, be defined
B-1.
General
separately, they may be so listed.
a. This section provides a general explanation of all
D - Adjust. To rectify to the extent necessary to
maintenance and repair functions authorized at various
bring into proper operating range.
maintenance levels.
E - Align. To adjust specified variable elements
b. Section II designates overall responsibility for the
of an item to bring to optimum performance.
performance of maintenance functions on the identified
F - Calibrate. To determine the corrections to be
end item or component.  The implementation of the
made in the readings of instruments or test equipment
maintenance functions upon the end item or component
used in precise measurement.
Consists of the
will be consistent with the assigned maintenance
comparison of two instruments, one of which is a
functions.
certified standard of known accuracy, to test and adjust
c. Section III-not applicable
any discrepancy in the accuracy of the instrument being
d.  Section IV contains supplemental instructions,
compared with the certified standard.
explanatory notes and / or illustrations required for a
G - Install. To set up for use in an operational
particular maintenance function.
environment such as an emplacement, site, or vehicle.
H - Replace.  To replace unserviceable items
B-2.
Explanation of Columns in Section II
with serviceable like items.
a. Group Number, Column (1). The assembly group
I - Repair.
Those maintenance operations
is a, numerical group assigned to each assembly in a top
necessary to restore an item to serviceable condition
down breakdown sequence. The applicable assembly
through correction of material damage or a specific
groups are listed on the MAC in disassembly sequence
failure. Repair may be accomplished at each category of
beginning with the first assembly removed in a top down
maintenance.
disassembly sequence.
J - Overhaul. Normally, the highest degree of
b.  Assembly Group, Column (2).  This column
maintenance performed by the Army in order to minimize
contains a brief description of the components of each
time work in process is consistent with quality and
assembly group.
economy of operation. It consists of that maintenance
c. Maintenance Functions, Column (3). This column
necessary to restore an item to completely serviceable
lists the various maintenance functions (A through K)
condition as prescribed by maintenance standards in
and  indicates  the  lowest  maintenance  category
technical publications for each item of equipment.
authorized to perform these functions.  The symbol
Overhaul normally does not return an item to like new,
designations for the various maintenance categories are
zero mileage, or zero hour condition.
as follows:
K - Rebuild.  The highest degree of material
maintenance.  It consists of restoring equipment as
C - Operator or crew
nearly as possible to new condition in accordance with
O - Organizational maintenance
original manufacturing standards. Rebuild is performed
F - Direct support maintenance
only when required by operational considerations or
H - General support maintenance
other paramount factors and then only at the depot
D - Depot maintenance
maintenance category.  Rebuild reduces to zero the
hours or miles the equipment, or component thereof, has
The maintenance functions are defined as follows:
been in use.
d.
Tools and Equipment, Column (4).
Not
A - Inspect. To determine serviceability of an
applicable.
item by comparing its physical, mechanical, and
c. Remarks, Column (5). This column is provided
electrical characteristics with established standards.
for referencing by code the remarks (sec. IV) pertinent to
B - Test. To verify serviceability and to detect
the maintenance functions.
electrical or mechanical failure by use of test equipment.
B-3.
Explanation of Columns in Section IV
C - Service. To clean, to preserve, to charge,
a. Reference Code. This column consists of two
and to add fuel, lubricants, cooling agents, and air. If it is
letters separated by a dash, both of which are references
desired that
to section II. The first letter references column (5) and
the second letter references a maintenance function,
column (3), A through K.
b. Remarks. This column lists information pertinent
to the maintenance function being performed, as
indicated on the MAC, Section II.
B-1

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