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