TM 11-7025-221-20
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 maintenance categories,
b. The Maintenance Allocation Chart (MAC) in section II designates overall authority and responsibility
for the performance of maintenance functions on the identified end item or component. The application
of the maintenance functions to the end item or component will be consistent with the capacities and
capabilities of the designated maintenance categories.
c. Section Ill lists the tools and test equipment (both special tools and common tool sets) required
for each maintenance function as referenced from section Il.
d. Section IV contains supplemental instructions and explanatory notes for a particular maintenance func-
tion.
B-2. Maintenance Functions.
Maintenance functions will be limited to and defined as follows:
a. Inspect. To determine the serviceability of an item by comparing its physical, mechanical, and/or
electrical characteristics with established standards through examination (e.g., by sight, sound, or feel).
b. Test, To verify serviceability by measuring the mechanical, pneumatic, hydraulic, or electrical char-
acteristics 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
(includes decontaminate, when required), to preserve, to drain, to paint, or to replenish fuel, lubricants,
chemical fluids, or gases.
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. Aline. 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. Remove/Install. To remove and install the same item when required to perform service or other main-
tenance 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. Rep/ace. To remove an unserviceable item and install a serviceable counterpart in its place. "Replace"
is authorized by the MAC and is shown as the 3d position code of the SMR code.
i. Repair. The application of maintenance services, including fault location/troubleshooting, remov-
al/installation, and disassembly/assembly procedures, and maintenance actions to identify troubles and restore
serviceability 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 serv-
iceable/operational condition as required by maintenance standards in appropriate technical publications (e.g.,
DMWR). Overhaul is normally the highest degree of maintenance performed by the Army. Overhaul does
not normally return an item to like new condition.
B-1
