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TM 1-6625-735-14
d.  Adjust. To maintain or regulate, within prescribed limits, by bringing into proper or exact position, or by
setting the operating characteristics to specified parameters.
e.
Align. To adjust specified variable elements of an item to bring about optimum or desired performance.
f. Calibrate. To determine and cause corrections to be made or to be adjusted on instruments or test, mea-
suring, and diagnostic equipments used in precision measurements. Consists of comparisons of two instruments,
one of which is certified standard of known accuracy, to detect and adjust any discrepancy in the accuracy of the
instrument being compared.
g.  Remove/Install. To remove and install the same item when required to perform service or other mainte-
nance functions. Install may be the act of emplacing, seating, or fixing into position a spare, repair part, or module
(component or assembly) in a manner to allow the proper functioning of an equipment or system.
h.  Replace. To remove an unserviceable item and install a serviceable counterpart in its place. 9Replace9 is
authorized by the MAC and assigned maintenance level is shown as the 3d position code of the SMR code.
i. Repair. The application of maintenance services, including fault location/troubleshooting, removal/
installation and disassembly/assembly procedures, and maintenance actions to identify troubles and restore ser-
viceability to an item by correcting specific damage, fault, malfunction, or failure in a part, subassembly, module
(component or assembly), end item, or system.
j. Overhaul. That maintenance effort (service/action) prescribed to restore an item to a completely serviceable/
operational condition as required by maintenance standards in appropriate technical publications (i.e., DMWR).
Overhaul is normally the highest degree of maintenance performed by the Army. Overhaul does not normally
return an item to like new condition.
k. Rebuild. 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 material main-
tenance applied to Army equipment/components.
B.4. EXPLANATION OF COLUMNS IN THE MAC, (SECTION II.).
a.
The functional groupings identify maintenance significant components, assemblies, subassemblies, and
modules with the next higher assembly.
b. Maintenance Function (Column 3). Column 3 lists the functions to be performed on the items listed in
column 2.
c. Maintenance Levels (Column 4). The maintenance levels AVUM, AVIM, and DEPOT are listed on the
Maintenance Allocation Chart with individual columns that include the work times for maintenance functions at
each maintenance level. Work time presentations such as 90.19 indicate the average time (expressed in man-hours
in whole hours or decimals) it requires a maintenance level to perform a specified maintenance function. If a work
time has not been established, the columnar presentation will indicate 9--.9 Maintenance levels higher than the
level of maintenance indicated are authorized to perform the indicated function.
d. Tools and Equipment Reference Code (Column 5). Column 5 specifies, by code, those common tool
sets (not individual tools), common TMDE, and special tools, special TMDE, and special support equipment
required to perform the designated function.
B-4

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