EXPLANATION OF COLUMNS IN THE MAC, SECTION II

TM 55-1905-223-24-17

Repair. The application of maintenance services1 including fault location/trouble- shooting2,

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), and item, or system.

Overhaul. That maintenance effort (service/action) prescribed to restore an item to a completely

serviceable/operational condition as required by maintenance standards in appropriate technical publications (i.

e. , DMWR). Overhaul in normally the highest degree of maintenance performed by the Army. Overhaul does

not normally return an item to like new condition.

k Rebuild. Consists of those service/actions necessary for the restoration of unserviceable

equipment to a like new condition in accordance with original manufacturing standards. Rebuild is the highest

degree or material maintenance applied to Army equipment. The rebuild operation includes the act of returning

to zero those age measurements (hours, miles, etc. ) considered in classifying Army equipment and

components.

B-3 EXPLANATION OF COLUMNS IN THE MAC, SECTION II

a 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.

b Column 2 - Component/Assembly . Column 2 contains the names of components, assemblies,

subassemblies, and modules for which maintenance is authorized.

c 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 A-2. )

d Column 4 - Maintenance Category. 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 that maintenance function at the indicated category

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 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 specific tasks identified for

the maintenance functions authorized in the maintenance allocation chart. The symbol designations for the

various maintenance categories are as follows:

C Operator or Crew

O Unit Maintenance

F Direct Support Maintenance (DS)

H General Support Maintenance (GS)

D Depot Maintenance

Service - Inspect, test, service, adjust, align, calibrate, and/or replace.

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).

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. , identification as maintenance significant).

Actions - Welding, grinding, riveting, straightening, facing, machining, and/or resurfacing.

Change 3 B-2