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 TM 55-1905-220-14-9
B-2.
EXPLANATION OF COLUMNS IN SECTION II (Continued).
(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. Consist 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.
B-2
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