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TM 10-4930-250-13&P
APPENDIXB
MAINTENANCE ALLOCATION CHART (MAC)
Section I. INTRODUCTION
B-1. The Army Maintenance System MAC
a. This introduction (section I) provides a general explanation of all maintenanceand repair functions authorized at
various maintenance levels under the standard Army Maintenance System concept.
b. The Maintenance Allocation Chart (MAC) in section Il 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 instruction and explanatory notes for a particular maintenance function.
B-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 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 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 instruments or test, measuring
and diagnostic equipment used in precise 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 onto position a spare, repair part or module
(component or assembly) in a manner to allow the proper functioning of an equipment or system.
B-1
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