TM 5-4610-218-12
APPENDIX D
MAINTENANCE ALLOCATION CHART
Section I. INTRODUCTION
D-1. General.
in precision measurement. Consists of comparisons
of two instrument, one of which is a certified stan-
a. This section provides a general explanation of
dard of known accuracy, to detect and adjust any
all maintenance and repair functions authorized at
discrepancy in the accuracy of the instrument being
various maintenance levels.
compared.
b. The Maintenance Allocation Chart (MAC) in
g. Install. The act of emplacing, seating, or fix-
section II designates overall responsibility for the
ing into position an item, part, or module (com-
performance of maintenance functions on the iden-
ponent or assembly) in a manner to allow the proper
tified end item or component. The implementation
functioning of an equipment or system.
of the maintenance functions upon the end item or
component will be consistent with the assigned
h. Replace. The act of substituting a serviceable
maintenance functions.
like type part, subassembly, or module (component
or assembly) for an unserviceable counterpart.
c. Section III lists the special tools and test
equipment required for each maintenance function
i. Repair. The application of maintenance ser-
as referenced from section II.
vices (inspect, test, service, adjust, align, calibrate,
or replace) or other maintenance actions (welding,
d. Section IV contains supplemental in-
grinding, riveting, straightening, facing, re-
structions on explanatory notes for a particular
machining, or resurfacing) to restore serviceability
maintenance function.
to an item by correcting specific damage, fault, mal-
function, or failure in a part, subassembly, module
D-2. Maintenance Functions.
(component or assembly), and item, or system.
a. Inspect. To determine the serviceability of an
j. Ouerhaul. That maintenance effort (services/
item by comparing its physical, mechanical and/or
actions) necessary to restore an item to a com-
electrical characteristics with established stan-
pletely serviceable/operational condition as pre-
dards through examination.
scribed by maintenance standards (e.e., DMWR) in
b. Test. To verify serviceability and detect incip
appropriate technical publications. Overhaul is nor-
ient failure by measuring the mechanical or elec-
mally the highest degree of maintenance performed
trical characteristics of an item and comparing
by the Army. Overhaul does not normally return an
those characteristics with prescribed standards.
item to like new condition.
c. Service. Operations required periodically to
k. Rebuild. Consists of those services factions
keep an item in proper operating condition, i.e., to
necessary for the restoration of unserviceable
clean (decontaminate), to preserve, to drain, to
equipment to a like new condition in accordance
paint, or to replenish fuel, lubricants, hydraulic flu-
with original manufacturing standards. Rebuild is
ids, or compressed air supplies.
the highest degree of material maintenance applied
to Army equipment. The rebuild operation includes
d. Adjust. To maintain, within prescribed lim-
the act of returning to zero those age measurements
its, by bringing into proper or exact position, or by
(hours/miles, etc.) considered in classifying Army
setting the operating characteristics to specified
equipments/components.
parameters.
e. Align. To adjust specified variable elements
D-3. Column Entries Used in the MAC.
of an item to bring about optimum or desired per-
formance.
a. Column 1, Group Number. Column 1 lists
group numbers, the purpose of which is to identify
f. Calibrate. To determine and cause cor-
components, assemblies, subassemblies, and mod-
rections to be made or to be adjusted on instruments
ules with the next higher assembly.
or test measuring and diagnostic equipments used
D-1
