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TM 1-1740-221-13&P&P
MAINTENANCE ALLOCATION CHART (MAC) INTRODUCTION - (CONTINUED)
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 maintenance
operations.
b. Repack. To return item to packing box after service and other maintenance operations.
c. Clean. To rid the item of contamination.
d. Touch up. To spot paint scratched or blistered surfaces.
e. Mark. To restore obliterated identiication.
4. Adjust. To maintain or regulate, within prescribed limits, by bringing into proper or exact position, or by setting
the operating characteristics to speciied parameters.
5. Align. To adjust speciied 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 measurement. Consists of comparisons of two instruments, one of
which is a certiied 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 xing 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 (ammunition only). To prepare and spray color coats of paint so that the ammunition can be identiied 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 ammunition identiication.
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 speciic damage, fault, malfunction, or failure in a part, subassembly, module (component or
assembly), end item, or system.
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