MAINTENANCE ALLOCATION CHART (MAC) INTRODUCTION CONTINUED
The assignment of a maintenance function will not be construed as authorization to carry the related repair parts or
spares in stock. Information to requisition or otherwise secure the necessary repair parts will be as specified in the
Normally there will be no deviation from the assigned level of maintenance. In cases of operational necessity, at the
request of a lower maintenance level and on a one-time basis, transfer of maintenance functions to the lower level
may be accomplished by specific authorization of the maintenance officer of the higher level of maintenance to which
the function is assigned. The special tools, equipment, etc., required by the lower level of maintenance to perform this
function will be furnished by the maintenance level to which the function is assigned. This transfer of a maintenance
function to a lower maintenance level does not relieve the higher maintenance level of the responsibility for the func-
tion. The higher level of maintenance will provide technical supervision and inspection of the function being performed
at the lower level.
Maintenance functions will be limited to and defined as follows:
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).
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, i.e., to clean (in-
cludes decontaminate, when required), to preserve, to drain, to paint, or to replenish fuel, lubricants, chem-
ical fluids, or gases.
Unpack. To remove from packing box for service when required for the performance of maintenance
Repack. To return item to packing box after service and other maintenance operations.
Touch up. To spot paint scratched or blistered surfaces.
Mark. To restore obliterated identification.
4. Adjust. To maintain or regulate, within prescribed limits, by bringing into proper or exact position, or by set-
ting the operating characteristics to specified parameters.
5. Align. To adjust specified variable elements of an item to bring about optimum or desired performance.
6. Calibrate. To determine and cause corrections to be made or to be adjusted on instruments of test, measur-
ing, 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 being compared.
7. 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.
8. Paint. To prepare and spray color coats of paint so that the ammunition can be identified and protected. The
color indicating primary use is applied, preferably, to the entire exterior surface as the background color of
the item. Other markings are to be painted as original so as to retain proper ammunition identification.
9. 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 Recoverability (SMR) code.
10. Repair. The application of maintenance services, including fault location/troubleshooting, removal/installa-
tion, disassembly/assembly procedures, and maintenance actions to identify troubles and restore service-
ability to an item by correcting specific damage, fault, malfunction, or failure in a part, subassembly, module
(component or assembly), end item, or system.