MAINTENANCE ALLOCATION CHART (MAC) INTRODUCTION (Contd)
MAINTENANCE FUNCTIONS (contd)
Repair. The application of maintenance services, including fault location/troubleshooting,
removal/installation, 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. The maintenance effort (service/action) prescribed to restore an item to a completely
serviceable/operational condition as required by maintenance standards in appropriate technical
publications. Overhaul is normally the highest degree of maintenance performed by the Army.
Overhaul does not normally return an item to like-new condition.
of services/actions necessary for the restoration
of unserviceable equipment
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 (e.g., hours/miles) considered in classifying Army
EXPLANATION OF COLUMNS IN THE MAC
Column 1 Group Number. Column (1) lists Functional Group Code (FGC) numbers. The purpose of
FGC numbers is to identify maintenance significant components, subassemblies, and
modules with the Next Higher Assembly (NHA).
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 a detailed explanation of these functions refer to Maintenance Functions
Column 4 Maintenance Level. Column (4) specifies each level of maintenance authorized to
perform each function listed in column (3), by indicating work-time required (expressed as
man-hours in whole hours or decimals) in the appropriate sub column. 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 varies at different maintenance levels, appropriate work time figures
are be shown for each level. The work time figure represents the average time required to
restore an item 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 time in addition to the time
required to perform the specific tasks identified for the maintenance functions authorized
in the MAC.
C Operator or crew maintenance
H General support maintenance
O Unit maintenance
D Depot maintenance
F Direct support maintenance
The "L" maintenance level is not included in Column 4 of
the MAC. functions to this level of maintenance are
identified by a work time figure in the "H" column of
Column 4, and an associated reference code is used in the
REMARKS column 6. this code iskeyed to the remarks and
the SRA complete repair applilcation is explained there.