TM 5-4310-369-14
MAINTENANCE ALLOCATION CHART
Section I. INTRODUCTION
i. Repair. The application of maintenance services
General
C-1 .
(inspect, test, service, adjust, align, calibrate or replace) or
a. This section provides a general explanation of all
other maintenance actions (welding, grinding, riveting,
maintenance and repair functions authorized at various
straightening, facing, remachining or resurfacing) to restore
maintenance levels.
serviceability to an item by correcting specific damage,
b. The Maintenance Allocation Chart (MAC) in Section
fault, malfunction, or failure in a part, subassembly,
II designates overall responsibility for the performance of
module (component or assembly), end item, or system.
maintenance functions on the identified end item or com-
j. Overhaul. That maintenance effort (services/actions)
ponent. The implementation of the maintenance functions
necessary to restore an item to a completely serviceable/
upon the end item or component will be consistent with
operational condition as prescribed by maintenance
the assigned maintenance functions.
standards (i.e., DMWR) in appropriate technical publications.
c. Section III lists the special tools and test equipment
Overhaul is normally the highest degree of maintenance per-
required for each maintenance function as referenced from
formed by the Army. Overhaul does not normally return an
Section II.
item to like new condition.
d. Section IV contains supplemental instructions on
k. Rebuild. Consists of those services/actions necessary
explanatory notes for a particular maintenance function.
for the restoration of unserviceable equipment to a like new
Maintenance Functions
C-2.
condition in accordance with original manufacturing
a. Inspect. To determine the serviceability of an item
standards. Rebuild is the highest degree of material mainte-
by comparing its physical, mechanical and/ or electrical
nance applied to Army equipment. The rebuild operation
characteristics with established standards through
includes the act of returning to zero those age measurements
examination.
(hours/miles, etc.) considered in classifying Army equip-
b. Test. To verify serviceability and detect incipient
ments/components.
failure by measuring the mechanical or electrical character-
C-3.
Column Entries Used in the MAC
istics of an item and comparing those characteristics with
a. Column 1, Group Number. Column 1 lists group
prescribed standards.
numbers, the purpose of which is to identify components,
c. Service. Operations required periodically to keep an
assemblies, subassemblies, and modules with the next
item in proper operating condition, i.e., to clean (decon-
higher assembly.
taminate), to preserve, to drain, to paint, or to replenish
b. Column 2, Component/Assembly. Column 2 contains
fuel, lubricants, hydraulic fluids, or compressed air supplies.
the names of components, assemblies, subassemblies, and
d. Adjust. To maintain, within prescribed limits, by
modules for which maintenance is authorized.
bringing into proper or exact position, or by setting the
operating characteristics to specified parameters.
c. Column 3, Maintenance Functions. Column 3 lists
e. Align. To adjust specified variable elements of an
the functions to be performed on the item listed in Column
2. (For detailed explanations of these functions, see para-
item to bring about optimum or desired performance.
graph D-2).
f. Calibrate. To determine and cause corrections to be
made or to be adjusted on instruments or test measuring and
d. Column 4, Maintenance Level. Column 4 specifies, by
the listing of a "work time" figure in the appropriate sub-
diagnostic equipments used in precision measurement. Con-
sists of comparisons of two instruments, one of which is a
column(s), the lowest level of maintenance authorized to
certified standard of known accuracy, to detect and adjust
perform the function listed in Column 3. This figure repre-
any discrepancy in the accuracy of the instrument being
sents the active time required to perform the maintenance
compared.
function at the indicated level of maintenance. If the number
g. Install. The act of emplacing, seating, or fixing into
or complexity of the tasks within the listed maintenance
function vary at different maintenance levels, the appropriate
position an item, part, or module (component or assembly)
work time figures will be shown for each level. The number
in a manner to allow the proper functioning of an equipment
of man-hours specified by the work time figure represents
or system.
the average time required to restore an item (assembly, sub-
h. Replace. The act of substituting a serviceable like type
assembly, component, module, end item, or system) to a
part, subassembly, or module (component or assembly) for
serviceable condition under typical field operating conditions.
an unserviceable counterpart.
