MAINTENANCE ALLOCATION CHART (MAC) INTRODUCTION - CONTINUED
MAINTENANCE FUNCTIONS - CONTINUED
The following definitions are applicable to the "repair" maintenance function:
Services - Inspecting, testing, servicing, adjustment, alignment, calibration, and/or replacement.
Fault location/troubleshooting - The process of investigating and detecting the cause of equipment mal-
functioning; the act of isolating a fault within a system or Unit Under Test (UUT).
Disassembly/assembly - The step-by-step breakdown (taking apart) of a spare/functional group coded
item to the level of its least component, assigned an SMR code for the level of maintenance under con-
sideration (i.e., identified as maintenance significant).
Actions - Welding, grinding, riveting, straightening, facing, machining, and/or resurfacing.
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.
Rebuild. Consists of services/actions necessary to restore unserviceable equipment to a like-new condition in accor-
dance 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 the age measurements (hours/miles, etc.) consid-
ered in classifying Army equipment/components.
EXPLANATION OF COLUMNS IN THE MAC, TABLE 1
Column (1) - Group Number. Column (1) lists Group numbers, the purpose of which is to identify maintenance signif-
icant components, assemblies, 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, above.)
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 manhours in whole hours or decimals) in the appro-
priate subcolumn. This work time figure represents the active time required to perform a 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 to be shown for each level. The work time figure repre-
sents 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 nec-
essary 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:
C - Operator/Crew Maintenance
O - Unit Maintenance
F - Direct Support Maintenance
H - General Support Maintenance
D - Depot Maintenance