MAINTENANCE ALLOCATION CHART (MAC)
Section I. INTRODUCTION
B-1. The Army Maintenance System MAC
This introduction (Section I) provides a general
explanation of all maintenance and repair functions
authorized at various maintenance levels under the
standard Army Maintenance System concept.
The Maintenance Allocation Chart (MAC) in
Section II designates overall authority and responsibility
for the performance of maintenance functions on the
identified end item or component. The application of
the maintenance functions to the end item or component
will be consistent with the capacities and capabilities of
the designated maintenance levels. Which are shown on
the MAC in column (4) as:
(operator/crew) and O (unit) maintenance.
Direct Support - includes an F subcolumn.
General Support - includes an H subcolumn.
Depot - includes a D subcolumn.
Section III lists the tools and test equipment (
both special tools and common tool sets) required for
each maintenance function as referenced from section
Section IV contains supplemental instructions
and explanatory notes for a particular maintenance
B-2. MAINTENANCE FUNCTIONS. Maintenance
functions are limited to and defined as follows: (see
188.8.131.52g for ammunition MAC exception).
Inspect. To determine the serviceability of an
item by comparing its physical, mechanical, and/or
electrical characteristics with established standards
through examination (e.g., by sight, sound, or feel).
b. Test. To verify serviceability by measuring the
characteristics of an item and comparing those
characteristics with prescribed standards.
Service. Operations required periodically to
keep an item in proper operating condition, e.g., to clean
(includes decontaminate, when required), to preserve, to
drain, to paint, or to replenish fuel, lubricants, chemical
fluids, or gases.
Adjust. To maintain or regulate, within
prescribed limits, by bringing into proper or exact
position, or by setting the operating characteristics to
Align. To adjust specified variable elements of
an item to bring about optimum and desired
Calibrate. To determine and cause correction
to be made or to be adjusted on instruments or test
measuring, and diagnostic equipment used in precision
measurement. Consists of comparisons of two
instruments, one of which is a certified standard of
known accuracy, to detect and adjust any discrepancy in
the accuracy of the instrument being compared.
Remove/Install. To remove and install the
same item when required to perform service or other
maintenance functions. Install may be the act of
emplacing, 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
h. Replace. To remove an unserviceable item
and install a serviceable counterpart in its place.
"Replace" is authorized by the MAC and the assigned
maintenance level is show as the 3rd position code of
the SMR code.