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MAINTENANCE FUNCTIONS.
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TM-11-5820-670-12 Radio Set AN/ARC-131(NSN
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Section II MAINTENANCE ALLOCATION CHART FOR RADIO SET AN/ARC-131


TM 11-5820-670-12
B-4. GROUP NUMBER AND COMPONENT/ASSEMBLY (COLUMNS 1 AND 2, RESPECTIVELY).
a. Column 1, Group Number. Column 1 lists group numbers, the purpose of which is to identify
components, assemblies, subassemblies, and modules with the next higher assembly.
b. Column 2, Component/Assembly. Column 2 contains the noun names of components,
assemblies, subassemblies, and modules for which maintenance is authorized.
B-5. MAINTENANCE FUNCTION (COLUMN 3).
Column 3 lists the functions to be performed on the items listed in column 2.
B-6. MAINTENANCE CATEGORIES AND WORK TIMES (COLUMN 4).
The maintenance categories (levels) AVUM, AVIM, and DEPOT are listed on the Maintenance
Allocation Chart with individual columns that include the worktimes for maintenance functions at each
maintenance level. Worktime presentations such as 0.1 indicate the average time it requires a
maintenance level to perform a specified maintenance function. If a worktime has not been
established, the columnar presentation shall indicate " .--. " Maintenance levels higher than the
level of maintenance indicated are authorized to perform the indicated function.
B-7. TOOLS AND TEST EQUIPMENT (COLUMN 5 AND SEC Ill).
Common tool sets (not individual tools), special tools, test, and support equipment required to
perform maintenance functions are listed alphabetically in Section Ill with a reference number to
permit cross-referencing to column 5 in the MAC. In addition, the maintenance category authorized to
use the device is listed along with the item National Stock Number (NSN) and, if applicable, the tool
number to aid in identifying the tool/device.
B-8. REMARKS (COLUMN 6 AND SEC IV).
Remarks (identified by an alphabetic code in column 6) and other notes (identified by a number in
parentheses in the applicable column) are listed in Section IV to provide a ready reference to the
definition of the remark/note.
B-4


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