MAINTENANCE ALLOCATION CHART
Section I. INTRODUCTION
measuring, and diagnostic equipments used in precision
measurement. Consists of comparisons of two
instruments, one of which is a certified standard of known
a. This section provides a general explanation of all
maintenance and repair functions authorized at the
accuracy, to detect and adjust any discrepancy in the
various maintenance levels.
accuracy of the instrument being compared.
g. Removel/Install. To remove and install the same
b. The Maintenance Allocation Chart (MAC) in
item when required to perform service or other
Section II designates overall authority and responsibility
maintenance functions. Install may be the act of
for the performance of maintenance functions on the
emplacing, seating, or fixing into position a spare, repair
identified end item or component. The application of the
part, or module (component or assembly) in a manner to
maintenance functions to the end item or component will
allow the proper functioning of an equipment or system.
be consistent with the capacities and capabilities of the
designated maintenance levels.
h. Replace. To remove an unserviceable item and
install a serviceable counterpart in its place. "Replace" is
c. Section III lists the tools and test equipment
authorized by the MAC and is shown as the third position
(both special tools and common tool sets) required for
of the SMR code.
each maintenance function as referenced from Section II.
i. Repair. The application of maintenance services,
including fault location/troubleshooting, removal/ instal-
d. Section IV contains supplemental instructions
lation, and disassembly/assembly procedures, and mainte-
and explanatory notes for a particular maintenance func-
nance actions to identify troubles and restore
serviceability to an item by correcting specific damage,
fault, malfunction, or failure in a part, subassembly, mod-
ule (component or assembly), end item, or system.
Maintenance functions will be limited to and defined as
j. Overhaul. That maintenance effort (service/ac-
tion) prescribed to restore an item to a completely servi-
ceable/operational condition as required by maintenance
a. Inspect. To determine the serviceability of an item
standards in appropriate technical publications (i.e.,
by comparing its physical, mechanical, and/or electrical
DMWR). Overhaul is normally the highest degree of
characteristics with established standards through
maintenance performed by the Army. Overhaul does not
examination (e.g., by sight, sound, or feel).
normally return an item to like new condition.
b. Test. To verify serviceability by measuring the me-
k. Rebuild. Consists of those services/actions
chanical, pneumatic, hydraulic, or electrical characteris-
necessary for the restoration of unserviceable equipment
tics of an item and comparing those characteristics with
to a like new condition in accordance with original
manufacturing standards. Rebuild is the highest degree of
materiel maintenance applied to Army equipment. The
c. Service. Operations required periodically to keep
rebuild operation includes the act of returning to zero
an item in proper operating condition, i.e., to clean
those age measurements (hours/miles, etc.) considered in
(includes decontaminate, when required), to preserve, to
classifying Army equipment/components.
drain, to paint, or to replenish fuel, lubricants, chemical
Explanation of Columns In the MAC,
fluids, or gases.
d. Adjust. To maintain or regulate, within prescribed
a. Column 1, Group Number. Column 1 lists
limits, by bringing into proper or exact position, or by set-
functional group code numbers, the purpose of which is to
ting the operating characteristics to specified parameters.
identify maintenance significant components, assemblies,
subassemblies, and modules with the next higher
e. Aline. To adjust specified variable elements of an
assembly. End item group number shall be "00."
item to bring about optimum or desired performance.
b. Column 2, Component/Assembly. Column 2 con-
tains the names of components, assemblies, subassem-
f. Calibrate. To determine and cause corrections to
blies, and modules for which maintenance is authorized.
be made or to be adjusted on instruments or test,