(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
(6) Calibrate. To determine and cause corrections to be made or to be adjusted on instruments or test
measuring and diagnostic equipments used in percision 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 subsituting a servicable like type part, subassembly or module (component or
assembly) for an unservicable 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 servicability 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 perscribed 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 equip-
d. Column (4), Maintenance Level. This column is made up of sub-columns 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.