ARMY TM 5-6675-309-14
MARINE CORPS TM 08840A-14/1
MAINTENANCE ALLOCATION CHART
Section 1. INTRODUCTION
measurement. Consists of comparisons of two instru-
ments, one of which is a certified standard of known
a. This appendix lists the maintenance operations
accuracy, to detect and adjust any discrepancy in the
for the Power Supply Test Set, AN/USM-428, LIN
accuracy of the instrument being compared.
T24899, SSN M767, NSN 6675-02-0075-4033. It autho-
rizes categories of maintenance functions for specific
g. Install. The act of emplacing, seating, or fixing
maintenance functions on repairable items and compo-
into position item, part, or module (component or
nents, and the tools and equipment required to perform
assembly) in a manner to allow the proper functioning
each function. This appendix may be used as an aid in
of an equipment or system.
planning maintenance operations.
h. Replace. The act of substituting a serviceable
b. The Maintenance Allocation Chart (MAC) in
like type part, subassembly, or module (component or
Section II designates the overall responsibility for the
assembly) for an unserviceable counterpart.
performance of maintenance functions on each item or
i. Repair. The application of maintenance services
component. Implementation of the maintenance forma-
(inspect, test, service, adjust, align, calibrate, replace) or
tions will be consistent with the assigned maintenance
other maintenance actions (welding, grinding, riveting,
straightening, facing, remachining, or resurfacing), to
c. Section III lists the special tools and test equip-
restore serviceability to an item by correcting specific
ment required for each maintenance function as refer-
damage, fault, malfunction, or failure in a part, subas-
enced in Section II.
sembly, module (component or assembly), end item, or
d. Section IV contains supplemental instructions
and explanatory notes for particular maintenance func-
j. Overhaul. That maintenance effort (service/ac-
tion) necessary to restore an item to a completely
serviceable/operational condition as prescribed by
D-2. Maintenance Functions. Maintenance functions
maintenance standards, i.e., DMWR, in appropriate
will be limited to and defined as follows:
technical publications. Overhaul is normally the highest
degree of maintenance performed by the Army. Over-
a. Inspect. To determine the serviceability of an
haul does not normally return an item to like new
item by comparing its physical, mechanical, and/or
electrical characteristics with established standards
k. Rebuild. Consists of those services/actions neces-
sary for the restoration of unserviceable equipment to a
b. Test. To verify serviceability and detect incipient
like new condition in accordance with original manu-
failure by measuring the mechanical or electrical char-
facturing standards. Rebuild is the highest degree of
acteristics of an item and comparing those characteris-
material maintenance applied to Army equipment. The
tics with prescribed standards.
rebuild operation includes the act of returning to zero
c. Service. Operations required periodically to keep
those age measurements (hours/miles etc.) considered in
an item in proper operating condition, i.e., to clean
classifying Army equipment/components.
(decontaminate); to preserve; to drain; to paint; or to
replenish fuel, lubricants, hydraulic fluids, or com-
pressed air supplies.
D-3. Maintenance Allocation Chart Column Entries,
d. Adjust. To maintain, within prescribed limits, by
bringing into proper or exact position, or by setting the
a. Column 1: Group Number. Column 1 lists the
operating characteristics to specified parameters.
group numbers which identify components, assemblies,
subassemblies, and modules with the next higher assem-
e. Align. To adjust specified variable elements of an
item to ring about optimum or desired performance.
f. Calibrate. To determine and cause corrections to
b. Column 2: Component/Assembly. Column 2 lists
be made or to be adjusted on instruments or test
the noun names of components, assemblies, subassem-
measuring and diagnostic equipments used in precision
blies, and modules for which maintenance is authorized.