MAINTENANCE ALLOCATION CHART (MAC) INTRODUCTION
THE ARMY MAINTENANCE SYSTEM MAC
This introduction provides a general explanation of all maintenance and repair functions authorized at the two mainte-
nance levels under the Two-Level Maintenance System concept.
The MAC (WP 0338 00), Table 1) 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 com-
ponent shall be consistent with the capacities and capabilities of the designated maintenance levels, which are shown in
Field - includes subcolumns:
C - Operator/Crew
O - Unit
F - Direct Support
Sustainment - includes subcolumns:
H - General Support
D - Depot
The tools and test equipment requirements (WP 0338 00, Table 2) list the tools and test equipment (both special tools
and common tool sets) required for each maintenance function as referenced from the MAC.
The remarks (WP 0338 00, Table 3) contain supplemental instructions and explanatory notes for particular maintenance
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 characteris-
tics with established standards through examination (i.e., 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 on a scheduled basis (e.g., load testing of lift devices and
hydrostatic testing of pressure hoses).
Service. Operations required periodically to keep an item in proper operating condition; e.g., to clean (includes decon-
taminate, when required), preserve, drain, paint or replenish fuel, lubricants, chemical fluids or gases.
Adjust. To maintain or regulate, within prescribed limits, by bringing into proper position, or by setting the operating
characteristics to specified parameters.
Align. To adjust specified variable elements of an item to achieve optimum or desired performance.
Calibrate. To determine and make corrections or adjustments on test, measurement and diagnostic equipment used in
precision measurement. Consists of comparisons of two instruments, one of which is a certified standard of known accu-
racy, to detect and adjust any discrepancy in the accuracy of the instrument being compared.
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 assem-
bly) 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 authorized by
the MAC and assigned maintenance level is shown as the third position code of the Source, Maintenance and Recover-
ability (SMR) code.
Repair. The application of maintenance services, including fault location/troubleshooting, removal/installation, disas-
sembly/assembly procedures, and maintenance actions to identify troubles and restore serviceability to an item by cor-
recting specific damage, fault, malfunction or failure in a part, subassembly, module (component or assembly), end item