Appendix B. MAINTENANCE ALLOCATION
Secton I. INTRODUCTION
B-1. THE ARMY MAINTENANCE SYSTEM MAC
a. This introduction (section I) provides a general explanation of ail maintenance and repair
functions authorized at various maintenance levels under the standard Army Maintenance System con-
b. the maintenance Allocation Chart (MAC) in section II designates overall authority and re-
sponsibility for the performance of maintenance functions on the identified end item or component. The
application of the maintence functions to the end item or component will be constant with the capacities
and capabilites of the designated maintenance levels, which are shown in the MAC in column (4) as:
Unit - includes two subcolunns C (operator/crew) and O (unit) maintenance.
Direct Support - includes an F subcolumn.
General Support - includes an H subcolumn.
Depot - includes an D subcolumn.
c. Section III lists the tools and test equipment (both special tools and common tools sets) re-
quired for eaoh maintenance function as referenced from section II.
d. Section IV contains supplemental instructions and explanatory notes for a particular mainte-
B - 2 .
MAINTENANCE FUNCTIONS. MAINTENANCE FUNCTIONS WILL BE LIMITED TO AND DEFINED
a. Inspect. To determine the serviceability of an item by comparing its physical, mechanical,
and/or electrical characteristics with established standards through examination (i.e., by sight sound, or
b. Test. to verify Serviceability by measuring the mechanical or electrical characteristics of an
item and comparing those characteristics with prescribed standards.
c. Service. Operations required periodically to keep an item in proper operating condition, i.e.,
to clean (includes decontamination, when required), to preserve, to paint, or to replenish fuel, Iubricants,
chemical fluids, or gases.
d. Adjust. To maintain or regulate, within prescribed limits, by bringing into proper or exact posi-
tion, or by setting the operating characteristics to specified parameters.
e. Aline. To adjust-d variable elements of an item to bring about optimum or desired
f. 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 dis-
crepancyin the accuracy of the instrument being Compared.
g. remove/install. To remove and install the same item when required to perform service or
othermaintenance functionsl maybe 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 equip-
ment or system.
h. Replace. To remove an unserviceable item and install a serviceable counterpart in its place.
Replace is authorized by the MAC and is shown as the 3rd position code of the SMR code.