TM 5-1940-321-13&P
APPENDIX A
MAINTENANCE ALLOCATION CHART (MAC)
SECTION I
INTRODUCTION
A.1.
The Army Maintenance System MAC.
A.1.1. This introduction (section I) provides a general explanation of all maintenance and repair functions
authorized at various maintenance levels under the standard Army Maintenance System concept.
A.1.2. 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
capabilities 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 includes a D subcolumn
A.1.3 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.
Maintenance Functions. Maintenance functions are limited to and defined as follows:
A.2.1. 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).
A.2.2. Test. To verify serviceability by measuring the mechanical, pneumatic, hydraulic, or electrical
characteristics of an item/end item and comparing those characteristics with prescribed standards.
A.2.3. 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.
A.2.4. Adjust. To maintain or regulate, within prescribed limits, by bringing into proper position, or by
setting the operating characteristics to specified parameter.
A-2
