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UNIT, DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE
MAINTENANCE ALLOCATION CHART (MAC)
The Army Maintenance System MAC
This introduction provides a general explanation of all maintenance and repair functions authorized at various levels
under the standard Army Maintenance System concept.
The MAC (immediately following the introduction) 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 shall be consistent with the capacities 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.
The tools and test equipment requirements, immediately following the MAC, if applicable, list the tools and test
equipment, both special tools and common tool sets, required for each maintenance function as referenced from
The remarks, immediately following the tools and test equipment requirements, if applicable, contain supplemental
instructions and explanatory notes for a particular maintenance function.
Maintenance functions are limited to and defined as follows:
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. This includes
scheduled inspection and gaugings and evaluation of cannon tubes.
Test. To verify serviceability by measuring the mechanical, pneumatic, hydraulic or electrical characteristics of
an item and comparing those characteristics with prescribed standards on a scheduled basis, i.e., load testing of
lift devices and hydrostatic testing of pressure hoses.
Service. Operations required periodically to keep an item in proper operating conditions; e.g., to clean, includes
decontaminate, when required, to preserve, to drain, to paint or to replenish fuel, lubricants, chemical fluids or
gases. This includes scheduled exercising and purging of recoil mechanisms.
Adjust. To maintain or regulate, within prescribed limits, by bringing into proper position, or by setting the
operating characteristics to specified parameters.
Align. To adjust specified variable elements of an item to bring about optimum or desired performance.