TM 5-4940-228-14
APPENDIX C
MAINTENANCE ALLOCATION CHART
Section I.
INTRODUCTION
C-1. General.
a. This section provides a general explanation of all maintenance and repair functions authorized at vari-
ous maintenance levels.
b. The Maintenance Allocation Chart (MAC) in Section II designates overall responsibility for the per-
formance 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 functions as refer-
enced from Section II.
d. Section IV contains supplemental instructions on explanatory notes for a particular maintenance func-
tion.
C-2. Maintenance Functions.
a. Inspect. To determine the serviceability of an item by comparing its physical, mechanical and/or elec-
trical characteristics with established standards through examination.
b. Test. To verify serviceablilty and detect incipient failure by measuring the mechanical or electrical
characteristics 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 (de-
contaminate), to preserve, to drain, to paint, or to replenish fuel, lubricants, hydraulic fluids, or compressed
air supplies.
d. Adjust. To maintain, within prescribed limits, by bringing into proper or exact position, or by setting
the operating 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 measurement. Consists of comparisons of two instru-
ments, one of which is certified standard of known accuracy, to detect and adjust any discrepancy in the accu-
racy of the instrument being compared
g. Install. The act of emplacing, seating, or fixing into position an item, part, or module (component or as-
sembly) 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 as-
sembly) 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 (com-
ponent or assembly), and item or system.
j. Overhaul. That maintenance effort (services/actions) necessary to restore an item to a completely ser-
viceable/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 maintenance 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.
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