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TM 9-2330-398-24
B-2. MAINTENANCE FUNCTIONS (continued).
g.
Remove/Install. To remove and install the same item when required to perform service or other maintenance
functions. "Install’ may be the act of emplacing, seating, or fixing into position a spare, repair part, or module
(component or assembly) in a manner to allow the proper functioning of an equipment or system.
h.
Replace. To remove an unserviceable item and install a serviceable counterpart in its place. "Replace" is
authorized by the MAC and is shown as the third position of the source, maintenance, and recoverability (SMR)
code.
i.
Repair. To apply maintenance services-including fault location/troubleshooting, removal/installation, and
disassembly/assembly procedures-and maintenance actions to identify troubles and restore serviceability to an
item by correcting any specific damage, fault, malfunction, or failure in a part, subassembly, module
(component or assembly), end item, or system.
j.
Overhaul. To perform that maintenance effort (service/action) required to restore an item to a completely
serviceable/operational condition as required by maintenance standards in an appropriate technical publication
(e.g., depot maintenance work requirement). 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. To perform 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 materiel
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 SECTION II, MAINTENANCE ALLOCATION CHART FOR SEMITRAILER,
TANK, M969A2.
a.
(1) Group Number. Column I lists functional group code numbers, whose purpose is to identify maintenance
significant components, assemblies, subassemblies, and modules with the next higher assembly. The end
item group number is "00."
b.
(2) Component/Assembly. Column 2 contains the names of components, assemblies, subassemblies, and
modules for which maintenance is authorized.
c.
(3) Maintenance Function. Column 3 lists the functions to be performed on the item listed in Column 2. (For
a detailed explanation of these functions, refer to para B-2.)
d.
(4) Maintenance Level. Column 4 specifies, by the listing of a work-time figure in the appropriate
subcolumn(s), the level 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 level of maintenance.
If the number or complexity of the tasks within the listed maintenance function varies 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 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 MAC. The symbol designations for the various maintenance levels are as follows:
B-2
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