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TM 10-5430-1232-12&P
Appendix B. MAINTENANCE ALLOCATION CHART
Section I. INTRODUCTION
B-1. THE ARMY MAINTENANCE SYSTEM MAC.
a. This introduction (section 1) 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 11 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 constant with the capacities and capabilities of the
designated maintenance levels, which are shown in 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 an 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.
B-2. MAINTENANCE FUNCTIONS. MAINTENANCE FUNCTIONS WILL BE 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 (i.e., by sight, sound or feel).
b. Test. To verify serviceability by measuring the mechanical or electrical characteristics of an item and
comparing those characteristics with prescribed standards.
c. Service. Operations required periodically to keep an item in proper operating condition, i.e., to clean
(includes decontamination, when required), to preserve, to paint, or to replenish fuel, lubricants, chemical
fluids, or gases.
d. Adjust. To maintain or regulate, within prescribed limits, by bringing into proper or exact position, or
by setting the operating characteristics to specified parameters.
e. Aline. 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 onto 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.
B-1
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