MAINTENANCE ALLOCATION CHART
SECTION I. INTRODUCTION
a. This section provides a general explanation of all maintenance and repair functions authorized at
various maintenance levels.
b. The Maintenance Allocation Chart (MAC) in section II designates overall responsibility for the
performance of maintenance functions on the identified end item or component. The implementation of the
maintenance functions upon the end item or component will be consistent with the assigned maintenance
c. Section III lists the special tools and test equipment required for each maintenance function as
referenced from section II.
d. Section IV contains supplemental instructions on explanatory notes for a particular maintenance
B-2. Maintenance Functions.
a. Inspect. To determine the serviceability of an item by comparing its physical, mechanical and/or
electrical characteristics with established standards through examination.
b. Test. To verify serviceability and detect incipient failure 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 (decontaminate), to preserve, to drain, to paint, or to
replenish fuel, lubricants, hydraulic fluids, or compressed air supplies.
d. Adjust. To maintain, within prescribed limits, by bringing into proper or exact position, or by setting
the operating characteristics to specified parameters.
e. Align. To adjust specified 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 equipments 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.
g Install. The act of emplacing, seating, or fixing into position an item, part, or module (component or
assembly) m a manner to allow the proper functioning of an equipment or system.
h. Replace. The act of substituting a serviceable like type part, subassembly or module (component or
assembly) for an unserviceable counterpart.
i. Repair. The application of maintenance services or other maintenance actions to 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.
j. Overhaul. That maintenance effort services/actions) necessary to restore an item to a completely
serviceable/operational condition as prescribed by maintenance standards (i.e., DMWR) m appropriate
technical publications. Overhaul is normally the highest degree of maintenance performed by the Army.
Overhaul does not normally return an item to like new condition.
k. Rebuild. Consists of those services/actions necessary for the restoration of unserviceable equipment
to a like new condition in accordance with original manufacturing standards. Rebuild is the highest degree of
materiel maintenance applied to Army equipment. The rebuild operation includes the act of returning to zero
those age measurements (hours/miles, etc.) considered in classifying Army equipments/components.
B-3. Column Entries Used in the MAC.
a. Column 1, Group Number. Column 1 lists group number, the purpose of which is to identify
components, assemblies, subassemblies and modules with the next higher assembly.
b. Column 2, Component/Assembly. Column 2 contains the names of components, assemblies, sub-
assemblies and modules for which maintenance is authorized.
c. Column 3, Maintenance Functions. Column 3 lists the functions to be performed on the item