EXPLANATION OF COLUMNS IN THE MAC, SECTION II

TM 55-1905-223-24-7

i. Repair. The application of maintenance services including fault location/troubleshooting , removal/installation,

and 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), and

item, or system.

j. 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 of 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