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TM 9-4110-257-14
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 levels 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 refrigeration unit. 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 - 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 will be 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 position, or by setting the
operating characteristics to specified parameters.
e. Aline. To adjust specified variable elements of an item to bring about optimum or desired performance.
B-1
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