TM 5-4310-276-14
MAINTENANCE
ALLOCATION
CHART
Section I. INTRODUCTION
g. Install. The act of emplacing, seating, or fix-
C-1.
General
ing into position an item, part, or module (com-
a. This section provides a general explanation of
ponent or assembly) in a manner to allow the proper
all maintenance and repair functions authorized at
functioning of an equipment or system.
various maintenance levels.
h. Replace. The act of substituting a ser-
b. The Maintenance Allocation Chart (MAC) in
viceable like type part, subassembly, or module
section II designates overall responsibility for the
(component or assembly) for an unserviceable coun-
performance of maintenance functions on the iden-
terpart.
tified end item or component. The implementation
i. Repair. The application of maintenance ser-
of the maintenance functions upon the end item or
vices (inspect, test, service, adjust, align, calibrate
component will be consistent with the assigned
or replace) or other maintenance actions (welding,
maintenance functions.
grinding, riveting, straightening, facing, re-
c. Section III lists the special tools and test
machining or resurfacing) to restore serviceability
equipment required for each maintenance function
to an item by correcting specific damage, fault, mal-
as referenced from Section II.
function, or failure in a part, subassembly, module
d. Section IV contains supplemental in-
(component or assembly), end item, or system,
structions on explanatory notes for a particular
j. Overhaul. That maintenance effort (services/
maintenance function.
actions) necessary to restore an item to a com-
pletely serviceable/operational condition as pre-
C-2.
M a i n t e n a n c e Functions
scribed by maintenance standards (i.e., DMWR) in
a. Inspect. To determine the serviceability of an
appropriate technical publications. Overhaul is nor-
item by comparing its physical, mechanical and/or
mally the highest degree of maintenance performed
electrical characteristics with established stan-
by the Army, Overhaul does not normally return an
dards through examination.
item to like new condition.
b. Test. To verify serviceability and detect in-
k. Rebuild. Consists of those services/actions
cipient failure by measuring the mechanical or elec-
necessary for the restoration of unserviceable
trical characteristics of an item and comparing
equipment to a like new condition in accordance
those characteristics with prescribed standards.
with original manufacturing standards. Rebuild is
c. Service. Operations required periodically to
the highest degree of materiel maintenance applied
keep an item in proper operating condition, i.e., to
to Army equipment, The rebuild operation includes
clean (decontaminate), to preserve, to drain, to
the act of returning to zero those age measurements
paint, or to replenish fuel, lubricants, hydraulic flu-
(hours/miles, etc.) considered in classifying Army
ids, or compressed air supplies.
equipments/components.
d. Adjust. To maintain, within prescribed lim-
its, by bringing into proper or exact position, or by
C-3.
Column Entries Used in the
setting the operating characteristics to specified
MAC
parameters <
e. Align To adjust specified variable elements
a. Column 1, Group Number. Column 1 lists
of an item to bring about optimum or desired per-
group numbers, the purpose of which is to identify
formance.
components, assemblies, subassemblies, and mod-
f. Calibrate. To determine and cause cor-
ules with the next higher assembly.
rections to be made or to be adjusted on instruments
b. Column 2, Component/Assembly. Column 2
or test measuring and diagnostic equipments used
contains the names of components, assemblies, sub-
in precision measurement. Consists of comparisons
assemblies, and modules for which maintenance is
of two instruments, one of which is a certified stan-
authorized.
dard of known accuracy, to detect and adjust any
c. Column 3, Maintenance Func-
discrepancy in the accuracy of the instrument being
tions. Column 3 lists the functions to be performed
compared.
on the item listed in Column 2. (For detailed expla-
C1
