TM 9-4120-357-14
APPENDIX B
MAINTENANCE ALLOCATION CHART
Section I. INTRODUCTION
B-1. General
a. This section provides a general explanation of all maintenance and repair functions authorized at various main-
tenance levels.
b. The maintenance allocation chart (MAC) in Section II designates overall responsibility for the performance of
maintenance functions on the identified end item or component. The implementation of the maintenance functions upon
the end item or component will be consistent with the assigned maintenance functions.
c. Section III lists the special tools and test equipment required for each maintenance function as referenced from
d. Section IV contains supplemental instructions on explanatory notes for particular maintenance function.
B-2. Maintenance Functions
a. Inspect. To determine the serviceability of an item by comparing its physical, mechanical and/or electrical char-
acteristics with established standards through examination.
b. Test. To verify serviceability and detect incipient failure by measuring the mechanical or electrical characteris-
tics of an item and comparing those characteristics with prescribed standards.
c. Service. Operations required periodically to keep an item in proper operating condition, i.e., to clean
(decontaminate), to preserve, to drain, to paint, or to replenish fuel, lubricants, hydraulic fluids, or compressed air sup-
plies.
d. Adjust. To maintain, within prescribed limits, by bringing into proper or exact position, or by setting the operat-
ing 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 measuring
and diagnostic equipments used in precision measurement. Consists of comparisons 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.
g. 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.
h. Replace. The act of substituting a serviceable like type part, subassembly, or module (component or assembly)
for an unserviceable counterpart.
i. Repair. The application of maintenance services or other maintenance actions to restore serviceability to an
item by correcting specific damage, fault, malfunction, or failure in a part, subassembly, module (component or assem-
bly), end item, or system.
j. Overhaul That maintenance effort (services/ actions) necessary to restore an item to a completely service-
able/operational condition as prescribed by maintenance standards (i.e., DMWR) in appropriate technical publications.
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. Consists of 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 mainte-
nance applied to Army equipment. The rebuild operation includes the act of returning to zero those age measurements
(hours/miles, etc.) considered in classifying Army equipments/components.
B-1
