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 code of the SMR code.
The application of maintenance services1.
including fault location/troubleshooting2,
removal/installation, and dtsassembly/assemby3 procedures, and maintenance actions4to 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.
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 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, 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 the 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 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., nodule, 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 special tasks identified for the maintenance functions authorized in the maintenance allocation chart. The symbol
designations for the various maintenance categories are C, O, F, H. and D.
C ....................... Operator or crew maintenance
O ...................... Unit maintenance
F........................ Direct support maintenance
H. ...................... General support maintenance
D ....................... Depot maintenance
Columns 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
Column 6. Remarks. This column shall, when applicable, contain a letter code in alphabetical order
which shall be keyed to the remarks contained In Section IV.
Services-Inspect, test, service, adjust, align, calibrate, and/or replace.
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)
Disassemble/assemble-. Encompasses the step-by-step taking apart (or breakdown) of a spare/functional 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.
Actions-Welding, grinding, riveting, straightening, facing, remachinery, and/or resurfacing