TM 9-2330-213-14&P
APPENDIX B
MAINTENANCE ALLOCATION CHART (MAC)
Section 1: INTRODUCTION (Cont.)
B-2. Maintenance Functions (Cont.)
NOTE
The following definitions are applicable to the "repair" maintenance function services:
Inspect, test, service, adjust, align, calibrate, and/or replace.
Fault location/troubleshooting. The process of investigating and detecting the cause of equipment
malfunctioning; the act of isolating a fault within a system of Unit Under Test (UUT).
Disassembly/assembly. The step-by-step breakdown (taking apart) of a spare/functional group coded item to
the level of its least component, that is assigned an SMR code of the level of maintenance under consideration
(i.e., identified as maintenance significant).
Actions. Welding, grinding, riveting, straightening, facing, machining, and/or resurfacing.
10.
Overhaul. That maintenance effort (service/action) prescribed to restore an item to a completely
serviceable/operational condition as required by maintenance standards in appropriate technical
publications. Overhaul is normally the highest degree of maintenance performed by the Army.
Overhaul does not normally return an item to "like new" condition.
11.
Rebuild. Consists of those services/actions necessary for the restoration of unserviceable equipment to
a "like new" condition in accordance with original manufacturing standards. Rebuild is the highest
degree of material maintenance applied to Army equipment. The rebuild operation includes the act of
returning to zero those age measurements (e.g., hours/miles) considered in classifying Army
equipment/components.
Explanation of Columns in the MAC
Column (1) Group Number. Column (1) lists FGC numbers, the purpose of which is to identify maintenance significant
components, assemblies, subassemblies, and modules with the Next Higher Assembly (NHA).
Column (2) Component/Assembly. Column (2) contains the item names of components, assemblies, subassemblies, and
modules for which maintenance is authorized.
Column (3) Maintenance Function. Column (3) lists the functions to be performed on the item listed in column (2). (For a
detailed explanation of these functions, refer to "Maintenance Functions" outlined above).
Column (4) Maintenance Level. Column (4) specifies each level of maintenance authorized to perform each function
listed in column (3), by indicating work time required (expressed as man-hours in whole hours or decimals) in the
appropriate subcolumn. This work time figure represents the active time required to perform that maintenance function at
the indicated level of maintenance. If the number or complexity of the tasks within the listed maintenance function varies
at different maintenance levels, appropriate work time figures are to be shown for each level. The work time figure
represents the average time required to restore an item (assembly, subassembly, component, module end item, or
system) to a serviceable condition under typical field operating conditions. This time includes preparation time (including
any necessary disassembly/assembly time), troubleshooting/fault location time, and quality assurance time in addition to
the time required to perform the specific tasks identified for the maintenance functions authorized in the MAC. The
symbol designations for the various maintenance functions are as follows:
Field:
Sustainment:
C Operator or crew maintenance
H General support maintenance
O Unit maintenance
D Depot maintenance
F Direction support maintenance
NOTE
The "L" maintenance level is not included in column (4) of the MAC. Functions to this level of maintenance
are identified by a work time figure in the "H" column of column (4), and an associated reference code is
used in the REMARKS column (6). This code is keyed to the remarks and the SRA complete repair
application is explained there.
Column (5) Tools and Equipment Reference Code. Column (5) specifies, by code, those common tool sets (not individual
tools), common Test, Measurement and Diagnostic Equipment (TMDE), and special tools, special TMDE and special
support equipment required to perform the designated function. Codes are keyed to the entries in the tools and test
equipment table.
Column (6) Remarks Code. When applicable, this column contains a letter code, in alphabetical order, which is keyed to
the remarks table entries.
B-2 Change 1