ARMY TM 9-6115-672-14
AIR FORCE TO 35C2-3-444-32
MARINE CORPS TM 09244A/09245A-14
Replace. To remove an unserviceable item and install a serviceable counterpart in its place. Replace
is authorized by the MAC and assigned as the third position code of the SMR code.
Repair. The application of 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 specific damage, fault, malfunction, or
failure in a part, subassembly, module (component or assembly), end item, or system.
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.
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
B.3 EXPLANATION OF COLUMNS IN THE MAC, SECTION II.
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".
Column 2, Component/Assembly. Column 2 contains the item names of components, assemblies,
subassemblies, and modules for which maintenance is authorized.
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).
Column 4, Maintenance Level. Column 4 specifies each level of maintenance authorized to perform
each function listed in column 3, by the indicating work time required (expressed as man-hours in
whole hours and 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 the listed maintenance function vary at different maintenance
levels, appropriate work time figure 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 (continuation/follow-on tasks) (including any necessary disassembly/assembly time),
troubleshooting/fault location time, and quality assurance 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:
When a complete replace or repair task performed at higher
level maintenance includes lower level maintenance tasks
(equipment condition/follow on tasks), the lower level work
time figures in the MAC must be added to the higher level
work time shown in the MAC to determine the total to
accomplish that maintenance function.