TM 10-4930-220-13&P
h.
i.
j.
k.
Replace. The act of substituting a serviceable like type part, subassembly, or module (component or as-
sembly) for an unserviceable counterpart.
Repair. The application of maintenance services (inspect, test, service, adjust, align, calibrate, or replace)
or other maintenance actions (welding, grinding, riveting, straightening, facing, remachining, or resurfac-
ing) 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.
Overhaul. That maintenance effort (service/actions) necessary to restore an item to a completely service-
able/operational condition as prescribed by maintenance standards (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.
Rebuild. 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 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 equipments/compo-
nents.
B-3. Column Entries.
Columns used in the Maintenance Allocation Chart will be limited to those shown. Entries for those col-
umns are explained below.
a.
b.
c.
d.
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.
Column 2, Component/Assembly. Column 2 contains the names of components, assemblies, subas-
semblies, and modules for which maintenance is authorized.
Column 3, Maintenance Function. Column 3 lists the functions to be performed on the item listed in Col-
umn 2. (For detailed explanation of these functions, see paragraph B–2)
Column 4, Maintenance Category. Column 4 specifies, by listing a work time figure in the appropriate
subcolumn(s), the category of maintenance authorized to perform the functions listed in column 3. This fig-
ure represents the active time required to perform that maintenance function at the indicated category of
maintenance. If the number or complexity of the tasks within the listed maintenance function vary at differ-
ent maintenance categories, appropriate work time figures will be shown for each category. The work time
figure represents the average time required to restore an item (assembly, subassembly, component, mod-
ule, end item, or system) to a serviceable condition under typical field operating conditions. This time in-
cludes preparation time (including any necessary disassembly/assembly time), troubleshooting/fault loca-
tion 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 Maintenance Allocation Chart. The symbol
designations for the various maintenance categories are as follows:
C
Operator or Crew
O ................................ Unit Maintenance
F . . . . . . . . . . . . . . . . . . . . . Direct Support Maintenance
H . . . . . . . . . . . . . . . . . . . . General Support Maintenance
D
. . . . . . . . . . . . . . . . . . . . Depot Maintenance
B-2
