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TM5-4120-376-14
APPENDIX B
MAINTENANCE ALLOCATION CHART (MAC)
SECTION I. INTRODUCTION
B-1. GENERAL.
a. This Section provides a general explanation of all maintenance and repair functions
authorized at various maintenance categories.
b. The Maintenance Allocation Chart (MAC) in Section II designates overall responsibility for
the performance of maintenance function on the identified end item or component will be
consistent with the capabilities of the designated maintenance categories.
c. Section III lists the tools and equipment 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
follows:
as
a. Inspect. To determine serviceability of an item by comparing its physical mechanical, or
electrical characteristics with established standards through examination.
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 (decontaminate), to preserve, to drain, to paint, or to replenish fuel, lubricants,
chemical fluids, or gases.
d. Adjust. To maintain within prescribed limits, by grinding into proper or exact position, or
by setting the operating characteristics to specified 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 instru-
ments or test measuring and diagnostic equipments used in precision measurement. Consists of
comparison 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.
g. Remove/Install. To remove and install the same item when required to perform service or
other maintenance functions.
h. Replace. To remove an unserviceable item and install a serviceable counterpart in its
p l a c e . “Replace” is authorized by the MAC and is shown as the 3d position code of the SMR
code.
B-1
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