Maintenance Allocation Chart (Cont)
B-3. The maintenance functions are defined as follows:
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
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 know 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) 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), 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.
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 of returning to zero those age measurements (hours/miles, etc.) considered in classifying Army
Replace. To remove an unserviceable item and install a serviceable counterpart in its place.