The Army Maintenance System MAC - Continued
Maintenance functions are limited to and defined as follows:
1. 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) this includes
scheduled inspection and gauging and evaluation of cannon tubes.
2. 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, i.e., load
testing of lift devices and hydrostatic testing of pressure hoses.
3. Service. Operations required periodically to keep an item in proper operation condition; e.g., to clean
(includes decontamination, when required), to preserve, to drain, to paint, or to replenish fuel, lubricants,
chemical fluids, or gases. This includes scheduled exercising and purging of recoil mechanisms. The
following are examples of service functions:
a. Unpack. To remove from packing box for service or when required for the performance of
b. Repack. To return item to packing box after service and other maintenance operations.
d. Touch up. To spot paint scratched or blistered surfaces.
e. Mark. To restore obliterated identification.
4. Adjust. To maintain or regulate, within prescribed limits, by bringing into proper position, or by setting 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,
measuring, and diagnostic equipment used in precision measurements. 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
8. Paint (ammunition only). 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 repainted as original so as to retain proper
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/
installation, disassembly/assembly procedures and maintenance actions to identify troubles and restore
serviceability to an item by correcting specific damage, fault, malfunction, or failure in a part, subassembly,
module (component or assembly), end item, or system.