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TM 1-4920-448-13&P
APPENDIX B
MAINTENANCE ALLOCATION CHART
SECTION I. INTRODUCTION
B-1. General.
a. This section provides a general explanation of all maintenance repair functions authorized at various
maintenance categories.
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 categories.
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 (e.g., by sight, sound, or feel).
b. Test To verify serviceability by measuring the mechanical, pneumatic, hydraulic, or electrical characteristics
of an item and comparing those characteristics with prescribed standards.
c. Service
.
Operations required periodically to keep an item in proper operational condition, i.e., to clean
(includes decontaminate, when required), to preserve, to drain, to paint, or to replenish fuel, lubricants, hydraulic
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 the 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 or to be adjusted on instruments or test measuring
and diagnostic equipments 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.
g. 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 into position a spare, repair part, or module
(Component or assembly) in a manner to allow the proper functioning of an equipment or system.
h. Replace
To remove an unserviceable item and install a serviceable counterpart in its place. “Replace” is
authorized by the MAC and is shown as the d position code of the SMR code.
B-1
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