consistent with the capacities and capabilities of the desig-
i. Repair. The application of maintenance services in-
nated maintenance levels, which are shown on the MAC
cluding fault location/troubleshooting, removal/installa-
in Column (4) as:
tion, and disassembly/assembly procedures, and mainte-
nance actions to identify troubles and restore serviceabili-
Unit-includes two subcolumns, C (operator/crew)
ty to an item by correcting specific damage, fault, malfunc-
and O (unit) maintenance.
tion, or failure in a part, subassembly, module (component
Direct Support-includes an F subcolumn.
or assembly), end item, or system.
General Support-includes an H subcolumn.
j. Overhaul. That maintenance effort (service/action)
Depot-includes a D subcolumn.
prescribed to restore an item to a completely serviceable/
c. Section III lists the tools and test equipment (both
operational condition as required by maintenance stan-
special tools and common tool sets) required for each
dards in appropriate technical publications (i.e., DMWR).
maintenance function as referenced from Section II.
Overhaul is normally the highest degree of maintenance
d. Section IV contains supplemental instructions and
performed by the Army. Overhaul does not normally re-
explanatory notes for a particular maintenance function.
turn an item to like new condition.
C-2. Maintenance Functions. Maintenance
k. Rebuild. Consists of those services/actions neces-
functions are limited to and defined as
sary for the restoration of unserviceable equipment to a
like new condition in accordance with original manufac-
turing standards. Rebuild is the highest degree of materiel
a. Inspect. To determine the serviceability of an item
maintenance applied to Army equipment. The rebuild op-
by comparing its physical, mechanical, and/or electrical
eration includes the act of returning to zero those age
characteristics with established standards through exami-
measurement (e.g., hours/miles) considered in classifying
nation (e.g., by sight, sound, or feel).
b. Test. To verify serviceability by measuring the me-
C-3. Explanation of Columns in the MAC,
chanical, pneumatic, hydraulic, or electrical characteris-
tics of an item and comparing those characteristics with
a. Column 1, Group Number. Column 1 lists functional
group code numbers, the purpose of which is to identify
c. Service. Operations required periodically to keep
maintenance significant components, assemblies, subas-
an item in proper operating condition; e.g., to clean (in-
semblies, and modules with the next higher assembly.
cludes decontaminate, when required), to preserve, to
b. Column 2, Component/Assembly. Column 2 con-
drain, to paint, or to replenish fuel, lubricants, chemical
tains the item names of components, assemblies, subas-
fluids, or gases.
semblies, and modules for which maintenance is autho-
d. Adjust. To maintain or regulate, within prescribed
limits, by bringing into proper position, or by setting the
c. Column 3, Maintenance Function. Column 3 lists the
operating characteristics to specified parameters.
functions to be performed on the item listed in Column
e. Align. To adjust specified variable elements of an
2. (For detailed explanation of these functions, see para-
item to bring about optimum or desired performance.
f. Calibrate. To determine and cause corrections to be
d. Column 4, Maintenance Level. Column 4 specifies
made or to be adjusted on instruments or test, measuring,
each level of maintenance authorized to perform each
and diagnostic equipment used in precision measurement.
function listed in Column 3, by indicating a work time re-
Consists of comparisons of two instruments, one of which
quired (expressed as man-hours in whole hours or deci-
is a certified standard of known accuracy, to detect and ad-
mals) in the appropriate subcolumn. This work-time fig-
just any discrepancy in the accuracy of the instrument be-
ure represents the active time required to perform that
maintenance function at the indicated level of mainte-
g. Remove/Install. To remove and install the same
nance. If the number or complexity of the tasks within the
item when required to perform service or other mainte-
listed maintenance function vary at different maintenance
nance functions. Install may be the act of emplacing, seat-
levels, appropriate work-time figures are shown for each
ing, or fixing into position a spare, repair part, or module
level. The work-time figure represents the average time
(component or assembly) in a manner to allow the proper
required to restore an item (assembly, subassembly, com-
functioning of an equipment or system.
ponent, module, end item, or system) to a serviceable con-
dition under typical field operating conditions. This time
h. Replace. To remove an unserviceable item and in-
includes preparation time (including any necessary disas-
stall a serviceable counterpart in its place. "Replace" is au-
sembly/assembly time), troubleshooting/fault location
thorized by the MAC and assigned maintenance level is
time, and quality assurance time in addition to the time re-
shown as the 3d position code of the SMR code.