B-2. MAINTENANCE FUNCTIONS - Continued
Replace. The act of substituting a serviceable like type part, subassembly, or module (component or assembly)
for an unserviceable counterpart.
Repair. The application of maintenance services (inspect, test, service, adjust, align, calibrate, or replace) or
other maintenance actions (welding, grinding, riveting, straightening, facing, remachining, or resurfacing) to restore
serviceability to an item by correcting specific damage, fault, malfunction, or failure in a part, subassembly, module
(component or assembly), and item, or system.
Overhaul. To restore an item to a complete serviceable condition as prescribed by maintenance serviceable
Rebuild. To restore an item to a standard as nearly as possible to original or new condition in appearance,
performance, and life expentancy. 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. COLUMN ENTRIES USED IN THE MAC
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.
Column 2 - Component/Assembly. Column 2 contains the names of components, assemblies, subassemblies,
and modules for which maintenance is authorized.
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).
Column 4 - Maintenance Level. 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 the 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 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