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APPENDIX A. REFERENCES - TM-5-4320-234-120090
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Section II. MAINTENANCE ALLOCATION CHART - TM-5-4320-234-120092
APPENDIX B
MAINTENANCE ALLOCATION CHART
Section I. INTRODUCTION
B-1. General.
equipment to a like-new condition in accordance with
a. This section provides a general explanation of
original manufacturing standards. Rebuild is the highest
degree of materiel maintenance applied to Army
all maintenance and repair functions authorized at
equipment. The rebuild operation includes the act of
various maintenance levels.
b. Section II designates overall responsibility for
returning to zero those age measurements (hours,
miles,
etc.)
considered
in
classifying
Army
the performance of maintenance functions on the
equipment/components.
identified end item or component. The implementation
h. Repair.
The  application  of  maintenance
of the maintenance functions upon the identified end
services (inspect, test, service, adjust, align, calibrate,
item or component will be consistent with the assigned
replace)  or  other  maintenance  actions  (welding,
maintenance functions.
grinding, riveting, straightening, facing, remachining, or
B-2. Maintenance Functions
resurfacing) to restore serviceability to an item by
correcting specific damage, fault, malfunction, or failure
Maintenance functions are defined as follows:
a. Adjust.  Maintain within prescribed limits by
in a part, subassembly, module/component/assembly,
end item, or system.
bringing into proper or exact position, or by setting the
i. Replace. The act of substituting a serviceable
operating characteristics to the specified parameters.
b. Align. To adjust specified variable elements of
like-type part, subassembly, module (component or
assembly) in a manner to allow the proper functioning of
an item to bring about optimum or desired performance.
c. Calibrate. To determine and cause corrections
an equipment/system.
j. Service.  Operations required periodically to
to be made or to be adjusted on instruments or test
keep an item in proper operating condition, i.e., to clean,
measuring and diagnostic equipment used in precision
preserve,
drain,
paint,
or
to
replenish
measurement.
Consists of comparisons of two
fuel/lubricants/hydraulic  fluids  or  compressed  air
instruments, one of which is a certified standard of
supplies.
known accuracy, to detect and adjust any discrepancy in
k. Test.  To verify serviceability and to detect
the accuracy of the instrument being compared.
d. Inspect. To determine the serviceability of an
incipient failure by measuring the mechanical or
electrical characteristics of an item and comparing those
item by comparing its physical, mechanical, and/or
characteristics with prescribed standards.
electrical characteristics with established standards
l. Symbols.  The uppercase letter placed in the
through examination.
e. Install. The act of emplacing, seating, or fixing
appropriate column indicates the lowest level at which
that particular maintenance function is to be performed.
into position an item, part, module (component or
assembly) in a manner to allow the proper functioning of
B-3. Explanation of Format
the equipment/system.
f. Overhaul.
Purpose and use of the format are as follows, and shall
That
maintenance
effort
be explained in the introductory portion of the MAC.
(service/action) necessary to restore an item to a
a. Column (1), Group number.  Column 1 lists
completely
serviceable/operational
condition
as
group numbers, the purpose of which is to match
prescribed by maintenance standards (e.g., DMWR) in
components, assemblies, subassemblies and modules
pertinent technical publications.  Overhaul is normally
with the next higher assembly.
the highest degree of maintenance performed by the
b. Column (2), Functional group. Column 2 lists
Army.  Overhaul does not normally return an item to
the next higher assembly group and the item names of
like-new condition.
g. Rebuild.  Consists of those services/actions
components, assemblies, subassemblies and modules
within the group for which maintenance is authorized.
necessary  for  the  restoration  of  unserviceable
B-1

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