MAINTENANCE FUNCTIONS DEFINED

TM 9-2320-363-20-2

when the engine is listed separately in the MAC. The symbol designations for the various maintenance categories remain

as follows:

Operator/Crew

Unit Maintenance

Direct Support Maintenance

General Support Maintenance

Depot Maintenance

Column 5, Tools and Equipment. Column 5 specifies, by code, those common tool sets (not individual tools) and

special tools, test, and support equipment required to perform the designated functions.

Column 6, Remarks. Column 6 references any amplifying remarks.

MAINTENANCE FUNCTIONS DEFINED

Inspect. To closely and critically examine (e.g., sight, sound, or feel) an item to detect errors, flaws, wear, etc., and

to determine its condition and serviceability by comparing its physical mechanical/electrical characteristics within

established standards.

Test. To verify serviceability and detect incipient failure by measuring the mechanical or electrical characteristics of

an item and comparing those characteristics with prescribed standards.

Service.

Operations required periodically to keep an item in proper operating condition; i.e., to clean

(decontaminate), to preserve, to drain, to paint, or to replenish fuel, lubricants, hydraulic fluids, or compressed air

supplies.

Adjust. To maintain, within prescribed limits, by bringing into proper or exact position, or by setting the operating

characteristics to specified parameters.

Aline. To adjust specified variable elements of an item to bring about optimum or desired performance.

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

diagnostic equipment used in precision measurement. Consists of comparison 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.

Install. The act of emplacing, seating, or fixing into position an item, part, or module (component or assembly) in a

manner to allow the proper functioning of an equipment or system.

Replace. The act of substituting a serviceable like type part, subassembly, or module (component or assembly) for

an unserviceable counterpart.

Repair. The application of maintenance services (inspect, test, service, adjust, aline, calibrate, or replace) or other

maintenance actions (welding, grinding, riveting, straightening, facing, remachining, or resurfacing) to 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.

Overhaul.

That maintenance effort (service/action) necessary to restore an item to a completely

serviceable/operational condition as prescribed by maintenance standards (i.e., DMWR) 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.

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