TM 9-4520-251-14
j.
Overhaul. That maintenance effort (service/action) prescribed to restore an item to a completely
serviceable/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 equip-
ment 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/ 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 assembly. End item group number shall be “00.”
b. Column (2) – Component/Assembly. Column 2 contains the names of components, assemblies,
subassemblies, and modules for which maintenance is authorized.
c.
Column (3) – Maintenance Functions. Column 3 lists the functions to be performed on the item listed
in column 2. (For detailed explanation of these functions, see paragraph B–2.)
d.
Column (4) - Maintenance Category. Column 4 specifies, by the listing of a work time figure in the
appropriate subcolumn(s), the category of maintenance authorized to perform the function listed
in column 3. This figure 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 different 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, module, end item, or system) to a serviceable condi-
tion under typical field operating conditions. This time includes preparation time (including any nec-
essary disassembly/assembly time), troubleshooting/fault location time, and quality assurance/
quality control time in addition to the time required to perform the specific task 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
e.
Column (5) – Tools and Equipment. Column 5 specifies, by code, those common tool sets (not indi-
vidual 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 or-
der, which shall be keyed to the remarks contained in Section IV.
B-4 EXPLANATION OF CO LUMNS IN TOOL AND TEST EQUIPMENT REQUIREMENTS, SECTION Ill.
a. Column (1) – Reference Code. The tool and test equipment reference code correlates with a code
used in the MAC, Section II, Column 5.
b. Column (2) – Maintenance Category. The lowest category of maintenance authorized to use the
tool or test equipment.
c.
Column (3) – Nomenclature. Name or identification of the tool or test equipment.
d. Column (4) – National Stock Number. The National stock number of the tool or test equipment.
e. Column (5)—Tool Number. The manufacturer’s part number.
B-5 EXPLANATION OF CO LUMNS IN SECTION IV.
a.
Column (1) – Reference Code. The code recorded in Column 6, Section Il.
b. Column (2) – Remarks. This column lists information pertinent to the maintenance function being
performed as indicated in the MAC, Section Il.
B-2
