TM 9-2320-289-20
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 the various maintenance levels.
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 levels.
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 II.
d. Section IV contains supplemental instructions and explanatory notes for a particular
maintenance function.
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 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. (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 maintenance 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.
B-1
