MAINTENANCE FUNCTIONS -726280884

TM 9-2320-364-20-1

MAINTENANCE FUNCTIONS - Continued

Calibrate. To determine and cause corrections to be made or to be adjusted on instruments of test,

measuring, and diagnostic equipment used in precision measurement. Consists of comparisons of two

instruments, one of which is a certified standard of known accuracy, to detect and adjust any discrepancy

in the accuracy of the instrument being compared.

Remove/Install. To remove and install the same item when required to perform service or other

maintenance functions. Install may be the act of emplacing, seating, or fixing into position a spare, repair

part, or module (component or assembly) in a manner to allow the proper functioning of an equipment or

system.

Replace. To remove an unserviceable item and install a serviceable counterpart in its place. "Replace" is

authorized by the MAC and assigned maintenance level is shown as the third position code of the Source,

Maintenance and Recoverability (SMR) code.

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 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.,

identified as maintenance significant).

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

resurfacing.

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

removal/installation, 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), end item, or system.

10.

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. Overhaul is normally the highest degree of maintenance performed by the Army. Overhaul

does not normally return an item to like new condition.

11.

Rebuild. Consists of those services/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 (e.g., hours/miles) considered in classifying Army

equipment/components.

EXPLANATION OF COLUMNS IN THE MAC

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

significant 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.)

B-2