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TM 55-1905-221-14-4
(4) Adjust. To maintain within prescribed limits, by grinding into proper or exact position, or by setting the
operating characteristics to specified parameters.
(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 adjusted 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, 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 in appropriate technical manuals. 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 organizational 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 (hours/miles, etc.) considered to classifying Army equipments/components.
d. Column (4) - Maintenance Level. This column is made up of subcolumns for each category of maintenance.
Work time figures are listed in these subcolumns 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.


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