TM 5-4520-241-14
(5) Align. To adjust specified variable elements of an item to bring about optimum or desired performance.
(6) Calibrate. To determine and cause corrections to be made or to be adjust on instruments or test measuring
and diagnostic equipments 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.
(7) 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.
(8) Replace. The act of substituting a serviceable like type part, a subassembly, or module (component or
assembly) for an unserviceable counterpart.
(9) Repair. The application of maintenance services (inspect, test, service, adjust, align, 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.
(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 of returning to zero those age
measurement (hours/miles, etc.) considered in classifying Army equipment/components.
d. Column 4. Maintenance Category. This column is made up of sub-columns for each category of maintenance.
Work time figures are listed in these sub-columns for the lowest level of maintenance authorized to perform the function
listed in Column 3. These figures indicate the average active time required to perform the maintenance function at the
indicated category of maintenance under typical field operating conditions.
e. Column 5. Tools and Equipment. This column is provided for referencing by code, the common tool sets (not
individual tools) special tools, test and support equipment required to perform the designated function.
B-2
