TM 9-4120-388-14
i. Repair. The application of maintenance services1 including fault location/troubleshooting2, removal/instal-
Iation, and disassembly/assembly3 procedures, and maintenance actions4 to identify troubles and restore serviceabili-
ty to an item by correcting specific damage, fault, malfunction, or failure in a part, subassembly, module (component
or assembly), end item, or system.
j. Overhaul. That maintenance effort (service/action) prescribed to restore an item to a completely service-
able/operational condition as required by maintenance standards in appropriate technical publications (i.e., DMWR).
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. Consists of those services/actions necessary for the restoration of unserviceable equipment to a
like new conditon in accordance with original manufacturing standards. Rebuild is the highest degree of materiel
maintenance applied to Army equipment. The rebuild operation includes the act of returning to zero those age mea-
surements (e.g., hours/miles) considered in classifying Army equipment/components.
B-3. EXPLANATION OF COLUMNS IN THE MAC, SECTION II,
a. Column 1, Group Number. Column 1 lists functional group code numbers, the purpose of which is to
identify maintenance significant components, assemblies, subassemblies, and modules with the next higher assem-
bly. End item group number shall be "00".
b. Column 2, Component/Assembly. Column 2 contains the item names of components, assemblies, subas-
semblies, 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 Col-
umn 2. (For detailed explanation of these functions, see paragraph B-2.)
d. Column 4, Maintenance Level. Column 4 specifies each level of maintenance authorized to perform each
function listed in Column 3, by indicating work time required (expressed as man-hours in whole hours or decimals) in
the appropriate subcolumn. This work-time 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 listed maintenance func-
tion vary at different maintenance levels, appropriate work-time figures will be shown for each level. The work-time _
figure represents the average time required to restore an item (assembly, subassembly, component, module, end
item, or system) to a serviceable conditon under typical field operating condtions. This time includes preparation time
(incIuding any necessary disassembly/assembly time), the troubleshooting/fault location and, and quality assurance
time in additon to the time required to perform the specific tasks identified for the maintenance functions authorzied in
the maintenance allocation chart. The symbol designations for the various maintenance levels are as follows:
C . . . . . . . . . . . Operator or crew maintenance
O . . . . . . . . . . . Unit maintenance
F . . . . . . . . . . . Direct support maintenance
H . . . . . . . . . . . General support maintenance
D . . . . . . . . . . . Depot maintenance
e. Column 5, TooIs 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 designated function.
f. Column 6, Remarks. This column shall, when applicable, contain a letter code, in alphabetic order, which
shall be keyed to the remarks contained in Section IV.
i
Services - Inspect, test, service, adjust, align, calibrate, and/or replace.
2
Fault Iocation/troubleshooting - The process of investigating and detecting the cause of equipment
malfunctioning; the act of isolating a fault within a system or unit under test (UUT).
3
Disassembly/assembly - The step-by-step breakdown (taking apart) of a spare/functional group coded
item to the level of its least component, that is assigned an SMR code for the level of maintenance under
consideration (i.e., identified as maintenance significant.)
4
Actions - Welding, grinding, riveting, straightening, facing, machining, and/or resurfacing.
B-2
