Calibrate. To determine and cause corrections to be made or to be adjusted on instruments or
test, measuring, and diagnostic equipment 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. Remove/Install. 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 equipment or sys-
The act of substituting a serviceable like - type part, subassembly, or module (com-
ponent 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, remachining, or
resurfacing) to restore serviceability to an item by correcting specific damage, fault, malfunction, or failure in
a part, subassembly, module (component or assembly); end item or system.
Overhaul. That maintenance effort (service/action) necessary to restore an item to a completely
serviceable/operational condition as required by maintenance standards in appropriate technical publications
(i.e. TM, DMWR). Overhaul in normally the highest degree of maintenance performed by the Army. Over-
haul does not normally return an item to like new condition.
Consists of those services/actions necessary for the restoration of unserviceable
equipment to a like new condition in accordance with original manufacturing standards. Rebuild is the high-
est degree of material maintenance applied to Army equipment, The rebuild operation includes the act of re-
turning to zero those age measurements (hours, miles, etc.) considered in classifying Army equipment/compo-
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, assem-
blies, subassemblies, and modules for which maintenance is authorized.
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 indi-
cated level of maintenance. If the number or complexity of the tasks within the listed maintenance function
vary 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 serviceable condition
under typical field operating conditions. This time includes preparation time, trouble-shooting time, and
B - 2