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TM 10-4320-347-13&P
APPENDIX B
MAINTENANCE ALLOCATION CHART
SECTION I. INTRODUCTION
B.1. The Army Maintenance System MAC.
a. This introduction (section I) provides a general explanation of all maintenance and repair functions
authorized at various maintenance categories under the standard Army Maintenance System concept.
b. 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 and F subcolumn.
General Support - includes an H subcolumn.
Depot - includes a D subcolumn.
c. 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.
d. Section IV contains supplemental instructions and explanatory notes for a particular maintenance
function.
B.2. Maintenance Functions. 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 standards.
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 or exact 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
performance.
B-1
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