APPENDIX B
MAINTENANCE ALLOCATION CHART
I N T R OD U C T I ON
Section I.
f. Calibrate. To determine and cause corrections to be made or to be
B-1. GENERAL.
adjusted on instruments or test, measuring, and diagnostic equipments used in
a. This section provides a general explanation of all maintenance and
precision measurement. Consists of comparisons of two instruments, one of
repair functions authorized at various maintenance categories.
which is a certified standard of known accuracy, to detect and adjust any
b. The Maintenance Allocation Chart (MAC) in section II designates overall
discrepancy in the accuracy of the instrument being compared.
authority and responsibility for the performance of maintenance functions on
g. Remove/Install. To remove and install the same item when required to
the identified end item or component. The application of the maintenance func-
perform service or other maintenance functions. Install maybe the act of
tions to the end item or component will be consistent with the capacities and
emplacing, seating, or fixing into position a spare repair part, or module (com-
capabilities of the designated maintenance categories.
ponent or assembly) in a manner to allow the proper functioning of an equip-
c. Section III lists the tools and test equipment (both special tools and
ment or system.
common tool sets) required for each maintenance function as referenced from
h. Replace. To remove an unserviceable item and install a serviceable
section Il.
counterpart in its place. "Replace" is authorized by the MAC and is shown as
d. Section IV contains supplemental instructions and explanatory notes for
the 3d position code of the SMR code.
a particular maintenance function.
i. Repair. The application of maintenance services, including fault loca-
tion/troubleshooting, removal/installation, and disassembly/assembly proce-
B-2. MAINTENANCE FUNCTIONS. Maintenance functions will be limited to
dures, and maintenance actions to identify troubles and restore serviceability to
and defined as follows:
an item by correcting specific damage, fault, malfunction, or failure in a part,
a. Inspect. To determine the serviceability of an item by comparing its
subassembly, module (component or assembly), end item, or system.
physical, mechanical, and/or electrical characteristics with established stan-
j. Overhaul. That maintenance effort (service/action) prescribed to
dards through examination (e.g., by sight, sound, or feel).
restore an item to a completely serviceable/operational condition as required
b. Test. To verify serviceability by measuring the mechanical, pneumatic,
by maintenance standards in appropriate technical publications (i.e., DMWR).
hydraulic, or electrical characteristics of an item and comparing those charac-
Overhaul is normally the highest degree of maintenance performed by the
teristics with prescribed standards.
Army. Overhaul does not normally return an item to like new condition.
c. Service. Operations required periodically to keep an item in proper
k. Rebuild. Consists of those services/actions necessary for the restora-
operating condition, i.e., to clean (includes decontaminate, when required), to
tion of unserviceable equipment to a like new condition in accordance with
preserve, to drain, to paint, or to replenish fuel, lubricants, chemical fluids, or
original manufacturing standards. Rebuild is the highest degree of materiel
gases.
maintenance applied to Army equipment. The rebuild operation includes the act
d. Adjust. To maintain or regulate, within prescribed limits, by bringing into
of returning to zero those age measurements (hours/miles, etc.) considered in
proper or exact position, or by setting the operating characteristics to specified
classifying Army equipment/components.
parameters.
e. Aline. To adjust specified variable elements of an item to bring about
optimum or desired performance.
TM 3-4230-209-20&P
B-1
