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TM 55-4920-442-13&P
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
function to the end item or component will be consistent with the capacities and capabilities of the designated
maintenance categories.
c. Section III lists the tools and test equipment required for each maintenance function as referenced from Section
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 and mechanical characteristics with
established standards through examination (e.g., by sight, sound, or feel).
b. Service.  Operations required periodically to keep an item in proper operating condition i.e.,
to clean,
to
preserve, to paint, or to replenish lubricants or gases.
c. Replace. 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.
d. Repair. The application of maintenance services, including fault location/troubleshooting, removal/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, or end item.
B-3. Explanation of Columns in the MAC, Section II.
a. Column 1, Group Number. Column 1 lists functional group code numbers, the purpose of which is to identify
maintenance of significant components, assemblies, and subassemblies, with the next higher assembly. End item
group number is "00".
B-1

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