TM 9-2510-247-13&P
MAINTENANCE ALLOCATION CHART
SECTION I. INTRODUCTION
1. THE ARMY MAINTENANCE SYSTEM MAINTENANCE ALLOCATION CHART (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 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 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.
2. MAINTENANCE FUNCTIONS
Maintenance functions are 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/end 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 specific parameters.
e. Align. To adjust specified variable elements of an item to bring about optimum or desired
performance.
f. 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 instruments, one of which is a certified standard of known accuracy, to
detect and adjust any discrepancy in the accuracy of the instrument being compared.
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