TM 10-4320-317-13
The application of maintenance services 1, including fault location troubleshooting 2,
i.
Repair.
removal/installation, and disassembly/assembly 3 procedures, and maintenance actions 4 to identify troubles
and 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.
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 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/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 Function. 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 condition under typical field operating conditions. This time
includes preparation time (including any necessary disassembly/assembly time), troubleshooting/fault
location 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
e.
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 designated function.
1
Services inspect, test, service, adjust, aline, calibrate, and/or replace.
2
Fault locate/troubleshoot 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
Disassemble/assemble encompasses the ste -by-step taking apart (or breakdown) of a spare/functional group
p
coded item to the level of its least componency identified as maintenance significant (i.e., assigned an SMR code)
for the category of maintenance under consideration.
4
Actions welding, grinding, riveting, straightening, facing, remachinery, and/or resurfacing.
B-2
