C - Service. To clean, to preserve, to charge, and to add fuel, lubricants, cooling agents, and air. If it is
desired that elements, such as painting and lubricating, be defined separately, they may be so listed.
D - Adjust. To rectify to the extent necessary to bring into proper operating range.
E - Align. To adjust specified variable elements of an item to bring to optimum performance.
F - Calibrate. To determine the corrections to be made in the readings of instruments or test equipment used in
precise measurement. Consists of the 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 with
the certified standard.
G - Install. To set up for use in an operational environment such as emplacement, site, or vehicle.
H - Replace. To replace unserviceable items with serviceable like items.
I - Repair. Those maintenance operations necessary to restore an item to serviceable condition through
correction of material damage to a specific failure. Repair may be accomplished at each category of
J - Overhaul. Normally, the highest degree of maintenance performed by the Army in order to minimize time
work in process is consistent with quality and economy of operation. It consists of that maintenance necessary
to restore an item to completely serviceable condition as prescribed by maintenance standard in technical
publications for each item of equipment. Overhaul normally does not return an item to like new, zero mileage,
or zero hour condition.
K - Rebuild. The highest degree of material maintenance. It consists of restoring equipment as nearly as
possible to new conditions in accordance with original manufacturing standards. Rebuild is performed only
when required by operational considerations or other paramount factors and then only at the depot
maintenance category. Rebuild reduces to zero the hours or miles the equipment, or component thereof, has
been in use.
Symbols. The uppercase letter placed in the appropriate column indicates the lowest level at which
that particular maintenance function is to be performed.
Tools and Equipment Column 4 . This column is provided for referencing by code, the special
tools and test equipment, (Section III) required to perform the maintenance functions (Section II).
Remarks. Column 5. This column is provided for referencing by code, the remarks (Section IV)
pertinent to the maintenance functions.
C-3. Explanation of Columns in Section III . Section III, Tools, Test, and Support Equipment. Requirements
is not applicable.
C-4. Explanation of Columns in Section IV . Section IV, Remarks, is not applicable.