MAINTENANCE ALLOCATION CHART (MAC) INTRODUCTION - CONTINUED
MAINTENANCE FUNCTIONS - CONTINUED
Repair. The application of maintenance services1 including fault location/troubleshooting2, removal/installation
and disassembly/assembly3 procedures, and maintenance actions4 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/oper-
ational condition as required by maintenance standards in appropriate technical publications (i.e. DMWR). Over-
haul 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 mainte-
nance applied to Army equipment. The rebuild operation includes the act of returning to zero those age measure-
ments (e.g. hours/miles) considered in classifying Army equipment/components.
EXPLANATION OF COLUMNS IN THE MAC, TABLE 1
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 item names of components, assemblies, subassem-
blies, and modules for which maintenance is authorized.
Column (3), Maintenance Function. Column 3 lists functions to be performed on the item listed in
Column (4), Maintenance Level. Column 4 specifies each level of maintenance authorized to perform each func-
tion listed in Column 3, by indicating work time required (expressed as manhours in whole hours or 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 mainte-
nance function vary at different maintenance levels, appropriate work-time figures are 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 time in addition to the time required to perform the specific tasks identified for the maintenance
functions authorized in the maintenance allocation chart. The symbol designations for the various maintenance
levels are as follows:
C. . . . . . . . . . . . . Operator or Crew Maintenance
O . . . . . . . . . . . . Unit Maintenance
F . . . . . . . . . . . . . Direct Support Maintenance
L . . . . . . . . . . . . . Specialized Repair Activity (SRA)
H . . . . . . . . . . . . General Support Maintenance
D . . . . . . . . . . . . Depot Maintenance
*Asterisk indicates level of maintenance authorized to complete this function. No time is established.
1.Services - Inspect, test, service, adjust, align, calibrate, and/or replace.
2.Fault location/troubleshooting - 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).
3.Disassembly/assembly - The step-by-step breakdown (taking apart) of a spare/functional group coded item to the
level of its least component, that is assigned an SMR code for the level of maintenance under consideration (i.e. iden-
tified as maintenance significant).
4.Actions - Welding, grinding, riveting, straightening, facing, machining, and/or resurfacing.