MAINTENANCE ALLOCATION CHART
Section I. Introduction
the accuracy of the instrument being compared.
a. This section provides a general explanation of
g. Install. The act of emplacing, seating, or fixing
all maintenance and repair functions authorized at
into position an item, part, or module (component or
various maintenance levels.
assembly) in a manner to allow the proper functioning of
b. The Maintenance Allocation Chart (MAC) in
an equipment or system.
Section II designates overall responsibility for the
h. Replace. The act of substituting a serviceable
performance of maintenance functions on the identified
like type part, subassembly, or module (component or
end item or component. The implementation of the
assembly) for an unserviceable counterpart.
maintenance functions upon the end item or component
The application of maintenance
will be consistent with the assigned maintenance
services (inspect, test, service, adjust, align, calibrate, or
replace) or other maintenance actions (welding, grinding,
c. Section III lists the special tools and test
equipment required for each maintenance function as
resurfacing) to restore serviceability to an item by
correcting specific damage, fault, malfunction, or failure
d. Section IV contains supplemental instructions on
in a part, subassembly, module (component or
explanatory notes for a particular maintenance function.
assembly), and item, or system.
j. Overhaul. That maintenance effort (services/
actions) necessary to restore an item to a completely
B-2. Maintenance Functions.
a. Inspect. To determine the serviceability of an
serviceable/operational condition as prescribed by
item by comparing its physical, mechanical and/or
maintenance standards (i.e., DMWR) in appropriate
electrical characteristics with established standards
technical publications. Overhaul is normally the highest
degree of maintenance performed by the Army.
To verify serviceability and detect
Overhaul does not normally return an item to like new
incipient failure by measuring the mechanical or
electrical characteristics of an item and comparing those
k. Rebuild. Consists of those services/actions
characteristics with prescribed standards.
necessary for the restoration of unserviceable equipment
Operations required periodically to
to a like new condition in accordance with original
keep an item in proper operating condition, i.e., to clean
manufacturing standards. Rebuild is the highest degree
(decontaminate), to preserve, to drain, to paint, or to
of materiel maintenance applied to Army equipment.
replenish fuel, lubricants, hydraulic fluids, or compressed
The rebuild operation includes the act of returning to
zero those age measurements (hours/miles, etc.)
d. Adjust. To maintain, within prescribed limits, by
considered in classifying Army equipments/components.
bringing into proper or exact position, or by setting the
operating characteristics to specified parameters.
B-3. Column Entries Used in the MAC.
e. Align. To adjust specified variable elements of
an item to bring about optimum or desired performance.
a. Column 1, Group Number. Column 1 lists
f. Calibrate. To determine and cause corrections
group numbers, the purpose of which is to identify
to be made or to be adjusted on instruments or test
components, assemblies, subassemblies, and modules
measuring and diagnostic equipments used in precision
with the next higher assembly.
Consists of comparisons of two
b. Column 2, Component/Assembly. Column 2
instruments, one of which is a certified standard of
contains the names of components, assemblies,
known accuracy, to detect and adjust any discrepancy in