TM 3-1040-262-13&P
APPENDIX D
MAINTENANCE ALLOCATION CHART
Section I. INTRODUCTION
or other maintenance actions to restore serviceability to
D-1.
General
an item by correcting specific damage, fault, malfunction,
a. This appendix provides a general explanation of
or failure in a part, subassembly, module (component or
all maintenance and repair functions authorized at
assembly), end item, or system.
various maintenance levels.
j. Overhaul.
That
maintenance
effort
b. The Maintenance Allocation Chart (MAC) in
(services/actions) necessary to restore an item to a
Section II designates overall responsibility for the
completely
serviceable/operational
condition
as
performance of maintenance functions on the identified
prescribed by maintenance standards (i.e., DMWR) in
end item or component. The implementation of the
appropriate technical publication. Overhaul is normally
maintenance functions upon the end item or component
the highest degree of maintenance performed by the
will be consistent with the assigned maintenance
Army. Overhaul does not normally return an item to like
functions.
new condition.
k. Rebuild.
Consists of those services/actions
equipment required for each maintenance function as
necessary for the restoration of unserviceable equipment
to a like new condition in accordance with original
manufacturing standards. Rebuild is the highest degree
and explanatory notes for a particular maintenance
of materiel maintenance applied to Army equipment.
function.
The rebuild operation includes the act of returning to zero
D-2.
Maintenance Functions
those age measurements (hours/miles, etc.) considered
a. Inspect To determine the serviceability of an
in classifying Army equipments/components.
item by comparing its physical, mechanical and/or
D-3.
Explanation of Columns in the MAC, Section
electrical characteristics with established standards
through examination.
b. Test To verify serviceability and detect incipient
a. Column 1, Group Number. Column 1 lists group
failure by measuring the mechanical or electrical
numbers, the purpose of which is to identify components,
characteristics of an item and comparing those
assemblies, subassemblies, and modules with the next
characteristics with prescribed standards.
higher assembly.
c. Service. Operations required periodically to
b. Column 2, Component/Assembly. Column 2
keep an item in proper operating condition, i.e., to clean
contains the names of components, assemblies,
(decontaminate), to preserve, to drain, to paint, or to
subassemblies, and modules for which maintenance is
replenish fuel, lubricants, hydraulic fluids, or compressed
authorized.
air supplies.
c. Column 3, Maintenance Functions. Column 3
d Adjust To maintain, within prescribed limits, by bringing
lists the functions to be performed on the item listed in
into proper or exact position, or by setting the operating
column 2. (For detailed explanation of these functions,
characteristics to specified parameters.
e. Align To adjust specified variable elements of an
d. Column 4, Maintenance Level. Column 4
item to bring about optimum or desired performance.
specifies, by the listing of a "work time" figure in the
f. Calibrate. To determine and cause corrections
appropriate subcolumn(s), the lowest level of
to be made or to be adjusted on instruments or test
maintenance authorized to perform the function listed in
measuring and diagnostic equipment used in precision
column 3. This figure represents the active time required
measurement.
Consists of comparisons of two
to perform the maintenance function at the indicated
instruments, one of which is a certified standard of
level of maintenance. If the number or complexity of the
known accuracy, to detect and adjust any discrepancy in
tasks within the listed maintenance function vary at
the accuracy of the instrument being compared.
different maintenance levels, appropriate "work time"
g Install The act of emplacing, seating, or fixing into
figures will be shown for each level. The number of
position an item, part, or module (component or
manhours specified by the" work time" figure represents
assembly)
in a manner to allow the proper
the average time required to restore an item (assembly,
functioning of an equipment or system.
subassembly, component, module, end item, or system)
h. Replace. The act of substituting a serviceable
to a serviceable condition under typical field operating
like type part, subassembly, or module (component or
condition.
This time includes preparation time,
assembly) for an unserviceable counterpart.
troubleshooting time, and quality assurance/quality
i. Repair. The application of maintenance services
control time in addition to the time required to perform
the specific tasks identified for the maintenance
functions authorized in the maintenance allocation chart.
D-1