ARMY TM 10-4610-309-14
MARINE CORPS TM 10802A-14/1
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TACTICAL WATER PURIFICATION SYSTEM (TWPS)
SUPPORTING INFORMATION
MAINTENANCE ALLOCATION CHART (MAC)
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 materiel 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 Functional Group Code (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 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 levels are as follows:
Field:
C Operator or Crew maintenance
O Unit maintenance
F Direct Support maintenance
Sustainment:
L Specialized Repair Activity
H General Support maintenance
D Depot 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.
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