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 iden-
tified end item or component. The implementation
of the maintenance functions upon the end item or
component will be consistent with the assigned
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 in-
structions on explanatory notes for a particular
B-2. Maintenance Functions.
a. Inspect. To determine the serviceability of an
item by comparing its physical, mechanical and/or
electrical characteristics with established stan-
dards through examination.
b. Test. To verify serviceability and detect in-
cipient failure by measuring the mechanical or elec-
trical 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 flu-
ids, or compressed air supplies.
d. Adjust. To maintain, within prescribed lim-
its, by bringing into proper or exact position, or by
setting the operating characteristics to specified
e. Align. To adjust specified variable elements
of an item to bring about optimum or desired per-
f. Calibrate. To determine and cause cor-
rections 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 stan-
dard of known accuracy, to detect and adjust any
discrepancy in the accuracy of the instrument being
g. Install. The act of emplacing, seating, or fix-
ing into position an item, part, or module (com-
ponent or assembly) in a manner to allow the proper
functioning of an equipment or system.
h. Replace. The act of substituting a ser-
viceable, like type part, subassembly, or module
(component or assembly) for an unserviceable coun-
i. Repair. The application of maintenance ser-
vices (inspect, test, service, adjust, align, calibrate,
or replace) or other maintenance actions (welding,
grinding, riveting, straightening, facing, re-
machining, or resurfacing) to restore serviceability
to an item by correcting specific damage, fault, mal-
function, or failure in a part, subassembly, module
(component or assembly), and item or system.
j. Overhaul. That maintenance effort (services/
actions) necessary to restore an item to a com-
pletely serviceable/operational condition as pre-
scribed by maintenance standards (i.e., DMWR) in
appropriate technical publications. Overhaul is nor-
mally 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 material 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
B-3. Column Entries Used In The MAC.
a. Column 1, Group Number. Column 1 lists
group numbers, the purpose of which is to identify
components, assemblies, subassemblies, and mod-
ules with the next higher assembly.