EXPLANATION OF COLUMNS IN THE MAC, SECTION II

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APPENDIX B. MAINTENANCE ALLOCATION CHART (MAC)

TM-55-1905-223-24-12 Fire Pump System for Landing Craft Utility (LCU) NSN 1905-01-154-1191 Manual

EXPLANATION OF COLUMNS IN TOOL AND TEST EQUIPMENT REQUIREMENTS, SECTION III

TM 55-1905-223-24-12

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

shooting2, removal/installation, and disassembly/assembly3 procedures, and maintenance ac-

tions4 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 sys-

tem.

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

completely serviceable/operational condition as required by maintenance standards in appropri-

ate 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 unservice-

able equipment to a like new condition in accordance with original manufacturing standards. Re-

build is the highest degree of material maintenance applied to Army equipment. The rebuild opera-

tion 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 pur-

pose 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 mainte-

nance 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 sys-

tem) to a serviceable condition under typical field operating conditions. This time includes prepara-

tion 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 spe-

cific 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/function-

al 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.

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