Inspect. To determine serviceability of an item by comparing its physical, mechanical, and electrical
characteristics with established standards through examination.
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, 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.
Align. 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 instructions 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
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, align, calibrate, or replace) or
other maintenance actions (welding, grinding, riveting, straightening, facing, re-machining 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.
(10) 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 a 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 materiel
maintenance applied to Army equipment. The rebuild operation includes the act or returning to zero those age
measurements (hours/miles, etc.) considered in classifying Army equipment/components.
Change 1 A-2