Quantcast MAINTENANCE ALLOCATION CHART (MAC) - TM-9-2330-394-13-P1373

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TM 9-2330-394-13&P
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) 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:
Field (Unit) - includes two subcolumns, C (Operator/Crew) and O (Field Level) maintenance.
Sustainment (Direct Support) - includes an F subcolumn.
Sustainment (General Support) - includes an H subcolumn.
Depot - includes a D subcolumn.
The tools and test equipment requirements (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 (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:
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).
Test. To verify serviceability by measuring the mechanical, pneumatic, or electrical characteristics of
an item and comparing those characteristics with prescribed standards.
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 lubricants,
chemicals, or fluids.
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
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