TM 9-2330-324-14&P
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MAINTENANCE ALLOCATION CHART (MAC)
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INTRODUCTION
The Army Maintenance System MAC
This introduction provides a general explanation of all maintenance and repair functions authorized at
various maintenance levels under the standard Army maintenance system concept.
The Maintenance Allocation Chart (MAC) (immediately following this 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 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 (Organizational) maintenance.
Direct Support—Includes an F subcolumn.
General Support—Includes an H subcolumn.
Depot—Includes a D subcolumn.
The Tools and Test Equipment Requirements (Table 2 immediately following the MAC) list the tools and
test equipment (both special tools and common tool sets) required for each maintenance function as
referenced from the MAC.
The Remarks (Table 3 immediately following the Tools and Test Equipment Requirements) contain
supplemental instructions and explanatory notes for a particular maintenance function.
Maintenance Functions
Maintenance functions are limited to and defined as follows:
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). This includes scheduled inspection, gagings, and evaluation of cannon tubes.
2.
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, e.g., load testing of lift devices and hydrostatic testing of pressure hoses.
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. This includes scheduled exercising and purging of recoil
mechanisms.
4.
Adjust. To maintain or regulate, within prescribed limits, by bringing into proper or exact position, or
by setting the operating characteristics to specified parameters.
5.
Align. To adjust specified variable elements of an item to bring about optimum or desired
performance.
