MAINTENANCE ALLOCATION CHART (MAC)
THE ARMY MAINTENANCE SYSTEM MAC
1. This introduction (Section I) provides a general explanation of all maintenance and repair
functions authorized at various maintenance levels under the Standard Army Maintenance
2. 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:
Unit-includes two subcolumns, C (operator/crew) and O (unit) maintenance.
Direct Support-includes an F subcolumn.
General Support-includes an H subcolumn.
Depot Support-includes a D subcolumn.
3. Section III lists the tools and test equipment (both special tools and common tool sets)
required for each maintenance function as referenced from Section II.
4. Section IV contains supplemental instructions and explanatory notes for a particular
Maintenance functions are limited to and defined as follows:
a. 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 mechanical, pneumatic, hydraulic, or
electrical characteristics of an item and comparing those characteristics with prescribed
c. 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.
d. Adjust. To maintain or regulate, within prescribed limits, by bringing into proper position,
or by setting the operating characteristics to specified parameters.
e. Align. To adjust specified variable elements of an item to bring about optimum or desired