To remove and install the same item when required to perform service or
other maintenance functions. Install may be the act of emplacing, sealing, or fixing into position a spare,
repair part, or module (component or assembly) in a manner to allow the proper functioning of an equip-
ment or system.
The act of substituting a serviceable like - type part, subassembly, or module
(component or assembly) for an unserviceable counterpart.
The application of maintenance services (inspect, test, service, adjust, align,
calibrate or replace) or other maintenance actions (welding, grinding, riveting, straightening, facing, rema-
chining, or resurfacing) to restore serviceability to an item by correcting specific damage, fault, malfunc-
tion, or failure in a part, subassembly, module (component or assembly), end item or system.
That maintenance effort (service/action) necessary to restore an item to a com-
pletely serviceable/operational condition as required by maintenance standards in appropriate technical
publications (i.e.T.M, DMWR). Overhaul in normally the highest degree of maintenance performed by the
Army. Overhaul does not normally return an item to like new condition.
Consists of those services/actions necessary for the restoration of unservice-
able equipment to a like new condition in accordance with original manufacturing standards. Rebuild is
the highest degree of material maintenance applied to Army equipment. The rebuild operation includes
the act of returning to zero those age measurements (hours, miles, etc.) considered in classifying Army
equipment and components.
B.3 EXPLANATION OF COLUMNS IN THE MAC, SECTION II.
Below are listed and defined
column entries for Section II, Maintenance Allocation Chart.
a. Column 1 - Group Number.
Column 1 lists group numbers, the purpose of which is to
identify components, assemblies, subassemblies, and modules with the next higher assembly.
b. Column 2 - Component/Assembly.
Column 2 contains the noun 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
items listed in column 2. These functions, are defined in paragraph B.2 above.
d. Column 4 - Maintenance Level.
Column 4 specifies, by the listing of a work time figure
in the appropriate sub column(s), the lowest level of maintenance authorized to perform the function listed
in Column 3. The figure represents the active time required to perform that maintenance function at the
indicated level of maintenance. If the number or complexity of the tasks within the listed maintenance
function varies at different maintenance levels, appropriate work time figure represents the average time
required to restore an item (assembly, subassembly, component, module, end item, or system) to a ser-
viceable condition under typical field operating conditions. This time includes preparation time, trouble-
shooting time, and quality assurance/quality control time in addition to the time required to perform the
specific tasks identified for the maintenance functions authorized in the MAC. The sub columns of Col-
umn 4 are as follows:
C. . . Operator or Crew
O . . . Unit Maintenance
F . . . Direct Support Maintenance
H . . General Support Maintenance
D . . . Depot Maintenance
Column 5 - Tools and Equipment.
Column 5 specifies, by code, those common tool
sets (not individual tools) and special tools, TMDE, and support equipment required to perform the desig-
B - 2