TM 10-4320-325-14
MAINTENANCE ALLOCATION CHART
Section I. INTRODUCTION
B-1. SCOPE
a. This section provides a general explanation of all maintenance and repair functions authorized at various
maintenance levels.
b. The Maintenance Allocation Chart (MAC) in Section II designates overall responsibility for performance of
maintenance functions on the identified end item or component and the work measurement time required to perform the
functions by the designated maintenance level.
c. Section III lists the tools and test equipment 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. EXPLANATION OF COLUMNS IN SECTION II
a. Column 1, Group Number. Column 1 lists group numbers to identify related components, assemblies,
subassemblies, and modules with their next higher assembly The applicable groups are listed in the MAC in disassembly
sequence beginning with the first group removed.
b. Column 2, Component/Assembly. This column contains the noun names of components, assemblies,
subassemblies, and modules for which maintenance is authorized.
c. Column 3, Maintenance Functions. This column lists the functions to be performed on the item listed in Column
2 The maintenance functions are defined as follows.
(1) Inspect. To determine 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.
(2) Test. To verify serviceability and detect incipient failure by measuring the mechanical or electrical
characteristics of an Item and company those characteristics with prescribed standards.
(3) 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 supplies.
(4) Adjust. To maintain within prescribed limits, by bringing into proper or exact position, or by setting the
operating characteristics to specified parameters.
(5) Align. To adjust specified variable elements of an item to bring about optimum or desired performance.
(6) Calibrate. To determine and cause corrections to be made or to be adjusted on instruments or test
measuring and diagnostic equipment used in precision measurement Consists of comparison 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.
(7) Remove/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.
(8) Replace. The act of substituting a serviceable like-type part, subassembly, or module (component or
assembly) for an unserviceable counterpart.
