MAINTENANCE ALLOCATION CHART
Section I. INTRODUCTION
THE ARMY MAINTENANCE SYSTEM MAINTENANCE ALLOCATION CHART
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.
The Maintenance Allocation Chart (MAC) in Section II designates overall authority and responsibil-
ity 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 Supportincludes an F subcolumn.
General Support- includes an H subcolumn.
Depot- includes a D subcolumn.
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.
Section IV contains supplemental instructions and explanatory notes for a particular maintenance
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, hydraulic, or electrical
characteristics of an item/end 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 fuel, lubricants,
chemical fluids, or gases.
Adjust. To maintain or regulate, within prescribed limits, by bringing into proper position, or by set-
ting the operating characteristics to specified parameters.
Aline. To adjust specified variable elements of an item to bring about optimum or desired perfor-
Calibrate. To determine and cause corrections to be made or to be adjusted on instruments or
test, measuring, and diagnostic equipment used in precision measurement. Consists of comparisons of two instru-
ments, one of which is a certified standard of known accuracy, to detect and adjust any discrepancy in the accu-
racy of the instrument being compared.
Remove/Install. To remove and install the same item when required to perform service or other
maintenance functions. Install may be the act of emplacing, seating, or fixing onto position a spare, repair part, or
module (component or assembly) in a manner to allow the proper functioning of an equipment or system.