MAINTENANCE FUNCTIONS - CONTINUED - TM-9-2320-302-20-21028

TM 9-2320-302-20-2

MAINTENANCE ALLOCATION CHART (MAC) INTRODUCTION - CONTINUED

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MAINTENANCE FUNCTIONS - CONTINUED

NOTE

The following definitions are applicable to the "repair" maintenance function:

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

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, that is assigned an SMR code for the level of maintenance under

consideration (i.e., identified as maintenance significant).

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

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

10.

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 those services/actions necessary for the restoration of unserviceable equipment to a like new con-

11.

dition in accordance 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 those age measurements (hours/

miles, etc.) considered in classifying Army equipment/components.

EXPLANATION OF COLUMNS IN THE MAC, TABLE 1

Column (1) - Group Number. Column (1) lists FGC numbers, the purpose of which is to identify maintenance signifi-

cant 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" outlined 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 that 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 neces-

sary 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 des-

ignations for the various maintenance levels are as follows:

Field:

C - Operator/Crew Maintenance

O - Unit Maintenance

D - Direct Support Maintenance

Sustainment:

H - General Support Maintenance

D - Depot Maintenance

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