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TM 55-4920-436-13&P
B-1. General.
a. This section provides a general explanation of all maintenance and repair functions authorized AVIM personnel.
b. The Maintenance Allocation Chart (MAC) in Section II designates overall authority and responsibility for the
performance of maintenance functions on the Engine Shop. 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. 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.
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. Column 2, Component/Assembly.
Column 2 contains the names of components, assemblies, and
subassemblies for which maintenance is authorized.
c. Column 3, Maintenance Function. Column 3 lists functions to be performed on the item listed in Column 2. (For
detailed explanation of these functions, see paragraph B-2.)


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