MAINTENANCE ALLOCATION CHART (MAC)
Section 1. INTRODUCTION
B-1. The Army Maintenance System MAC.
b. Test. To verify serviceability by measuring the
mechanical, pneumatic, hydraulic, or electrical charac-
a. This introduction (Section I) provides a gen-
teristics of an item and comparing those charac-
eral explanation of all maintenance and repair func-
teristics with prescribed standards.
tions authorized at various maintenance levels under
the standard Army Maintenance System concept.
c. Service. Operations required periodically to
keep an item in proper operating condition, e.g., to
b. The Maintenance Allocation Chart (MAC) in
clean (includes decontaminate, when required), to pre-
Section II designates overall authority and responsibil-
serve, to drain, to paint, or to replenish fuel. lubri-
ity for the performance of maintenance functions on
cants, chemical fluids, or gases.
the Identified end item or component. The application
of the maintenance functions to the end item or com-
d. Adjust. To maintain or regulate, within pre-
ponent will be consistent with the capacities and capa-
scribed Iimits, by bringing into proper or exact posi-
bilities of the designated maintenance levels, which
tion, or by setting the operating characteristics to
are shown on the MAC in column (4) as:
Unit - includes two subcolumns, C (opera-
e. Align. To adjust specified variable elements
tor/crew) and O (unit) maintenance.
of an item to bring about optimum and desired per-
Direct Support includes an F subcolumn.
f. Calibrate. To determine and cause correction
General Support - includes an H subcolumn.
to be made or to be adjusted on instruments or test,
measuring, and d/agnostic equipment used in preci-
sion measurement. Consists of comparisons of two in
Depot - includes a D subcolumn
struments, one of which is a certified standard of
known accuracy, to detect and adjust any discrep-
c. Section III lists the tools and test equipment
ancy in the accuracy of the instrument being come
(both special tools and common tool sets) required for
each maintenance function as referenced from sec-
g. Remove / Install. To remove and install the
same item when required to perform service or other
d. Section IV contains supplemental instructions
maintenance functions install may be the act of em-
and explanatory notes for a particular maintenance
placing, seating, or fixing into position a spare, repair
part, or module (component or assembly) in a manner
to allow the proper functioning of an equipment or sys-
B-2. MAINTENANCE FUNCTIONS. Maintenance
functions are limited to and defined as follows: (see
h. Replace. To remove an unserviceable item
and install a serviceable counterpart in its place. "Re-
a. Inspect. To determine the serviceability of an
place" is authorized by the MAC and the assigned
item by comparing its physical, mechanical, and/or
maintenance level is shown as the 3rd position code
electrical characteristics with established standards
of the SMR code.
through examination (e.g.. by sight, sound. or feel)