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TM 10-3930-638-24&P
APPENDIX B
MAINTENANCE ALLOCATION CHART
Section I. INTRODUCTION
B-1. GENERAL
a. This section provides a general explanation of all main-
tenance and repair functions authorized at various main-
tenance levels.
b. The Maintenance Allocation Chart (MAC) in section II
designates overall responsibility for the performance of
maintenance functions on the identified component or
assembly. The implementation of the maintenance func-
tions upon the component or assembly will be consistent
with the assigned maintenance functions,
c. Section III lists the special tools and test equipment
requirement for each maintenance function as referred
from section II.
d Section IV contains supplemental instructions or
explanatory notes for a particular maintenance function.
B-2. MAINTENANCE FUNCTIONS
a. Inspect. To determine the serviceability of an item by
comparing its physical, mechanical and/or electrical char-
acteristics with established standards through examination.
b. Test. To verify serviceability and detect incipient fail-
ure by measuring the mechanical or electrical character-
istics of an item and comparing those characteristics with
prescribed standards.
c. Service. Operations required periodically to keep an
item in proper operating condition, i.e., to clean (decon-
taminate); to preserve; to drain; to paint; or to replenish
fuel, lubricants, or hydraulic fluid.
d. Adjust. To maintain, within prescribed limits, by
bringing into proper or exact position, or by setting the
operating characteristics to specified parameters.
e. Align. To adjust specified variable elements of an item
to bring about optimum or desired performance.
f. Calibrate. To determine and cause corrections to be
made or to be adjusted on instruments or test measuring
and diagnostic equipments used in precision measurement.
Consists of comparisons of two instruments, one of which
is a certified standard of known accuracy, to detect and
adjust any discrepancy in the accuracy of the instrument
being compared.
g. Install. The act of emplacing, setting, or fixing into
position an item, component, or assembly in a manner to
allow the proper functioning of an equipment or system.
h. Replace. The act of substituting a serviceable-like part,
subassembly, or module (component or assembly) for an
unserviceable counterpart.
i. Repair. The application of maintenance services1 or
other maintenance actions2 to restore serviceability to an
item by correcting specific damage, fault, malfunction, or
failure in a part, subassembly, module (component or
assembly), and item, or system.
j. Overhaul. That maintenance effort (service/actions)
necessary to restore an item to a completely serviceable/
operational condition as prescribed by maintenance stan-
dards (i.e., DMWR) in appropriate technical publications.
Overhaul is normally the highest degree of maintenance
performed by the Army. Overhaul does not normally return
an item to like-new condition.
k. Rebuild. Consist of those services{ actions necessary for
the restoration of unserviceable equipment to a like-new
condition in accordance with original manufacturing stan-
dards. Rebuild is the highest degree of material mainten-
ance applied to Army equipment. The rebuild operation
includes the act of returning to zero those age measure-
ments (hours/miles, etc.) considered in classifying Army
equipments/components.
B-3. COLUMN ENTRIES USED IN
THE MAC
a. Column 1, Group Number. Column 1 lists group num-
bers, the purpose of which is to identify components, assem-
blies, and modules with the next higher assembly.
b. Column 2, Component/Assembly. Column 2 contains
the names of components, assemblies, subassemblies, and
modules for which maintenance is authorized.
c. Column 3, Maintenance Function. Column 3 lists the
functions to be performed on the item listed in column 2.
(For detailed explanation of these functions, see para B-2.)
d. Column 4, Maintenance Catagory. Column 4 specifies,
by the listing of a “work time” figure in the appropriate
subcolumn(s), the lowest level of maintenance authorized
to perform the function listed in column 3. This figure
represents the active time required to perform the main-
tenance functions at the indicated level of maintenance. If
the number or complexity of the tasks within the listed
miaintenance function vary at different levels, appropriate
“work time” figures will be shown for each level, The num-
ber of man-hours specified by the “work time” figures
represents the average time required to restore an item
(assembly, subassembly, component, module, end item or
system) to a serviceable condition. This time includes pre-
paration time, troubleshooting time, and quality assurance/
1Service – Inspect, test, service, adjust, align, calibrate, or replace.
2Action – Welding, grinding, riveting, straightening, facing, remachining, or resurfacing.
B -1
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