EXPLANATION OF COLUMNS IN THE MAC, SECTION II.

TM 5-4120-386-14

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

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 highest assembly. End item group

numbers shall be "00".

b. COLUMN 2, COMPONENT/ASSEMBLY. Column 2 contains the 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 detailed explanation of these

d. COLUMN 4, MAINTENANCE CATEGORY. Column 4 specifies, by listing of a

work time figure in the appropriate subcolumn(s), the category of maintenance,

authorized to perform the functions 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 vary 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:

Operator or Crew

Organizational Maintenance

Direct Support Maintenance

General Support Maintenance

Specialized Repair Activity

Depot Maintenance

Services-inspect, test, service, adjust, aline, calibrate, and/or replace.

Fault locate/troubleshoot-The process or investigating and detecting the

cause of equipment malfunctioning; the act of isolating a fault within a

system or unit under test (UUT).

Disassemble/Assemble-Encompasses the step-by-step taking apart (or breakdown)

of a spare/functional group coded item to the level of its least componency identified

as maintenance significant; (i.e., assigned an SMR code) for the category of

maintenance under consideration.

Actions-Welding, grinding, riveting, straightening, facing, remachining

and/or resurfacing.

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