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TM 5-4210-220-12
group 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) procedures, and maintenance actions (welding,
grinding, riveting, straightening, facing remachining, and/or resurfacing) 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. To restore an item to a complete serviceable condition as prescribed by maintenance serviceable
standards.
k.
Rebuild. To restore an item, to a standard as nearly as possible to original or new condition in appearance,
performance, and life expectancy. This is accomplished through the maintenance technique of complete
disassembly of the item, inspection of all parts or components, repair or replacement of worn or unserviceable
elements using original manufacturing tolerances and specifications and subsequent reassembly of the item.
B-3. EXPLANATION OF COLUMNS IN THE MAC, SECTION II.
a.
Column 1, Group Number. Column 1 lists functional group 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 "worktime" 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 "worktime" figures will be shown for each category. The number of task-
hours specified by the "worktime" figures will be shown for each category. The number of task-hours specified by
the "worktime" 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/subassembly
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 categories are as follows:
C
Operator/Crew
O
Unit Maintenance
F
Intermediate Direct Support Maintenance
H
Intermediate General Support Maintenance
D
Depot Maintenance
e.
Column 5, Tools and Equipment. Column 5 specifies by code, those common tools 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 in Section IV.
B-2
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