MAINTENANCE ALLOCATION CHART (MAC) INTRODUCTION
THE ARMY MAINTENANCE SYSTEM MAC
This introduction provides a general explanation of all maintenance and repair functions authorized at various
maintenance levels under The Army Maintenance Management System (TAMMS) concept.
The Maintenance Allocation Chart (MAC) in Table 1 designates overall authority and responsibility for the perfor-
mance 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.
Table 2 lists the tools and test equipment (both special tools and common tool sets) required for each maintenance
Table 3 contains supplemental instructions and explanatory notes for a particular maintenance function.
Maintenance functions are limited to and defined as follows:
Inspect. To determine the serviceability of an item by comparing its physical, mechanical, and/or electrical char-
acteristics with established standards through examination (e.g., by sight, sound, or feel).
Test. To verify serviceability by measuring the mechanical, pneumatic, hydraulic, or electrical characteristics of
an item and comparing those characteristics with prescribed standards.
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
Adjust. To maintain or regulate, within prescribed limits, by bringing into proper position, or by setting the oper-
ating characteristics to specified parameters.
Align. To adjust specified variable elements of an item to bring about optimum or desired performance.
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
Remove/Install. To remove and install the same item when required to perform service or other maintenance func-
tions. Install may be the act of emplacing, seating, or fixing into position a spare, repair part, or module (compo-
nent or assembly) in a manner to allow the proper functioning of an equipment or system.
Replace. To remove an unserviceable item and install a serviceable counterpart in its place. "Replace" is autho-
rized by the MAC and the assigned maintenance level is shown as the third position code of the SMR code.