MODERN BURNER UNIT (MBU)
MAINTENANCE ALLOCATION CHART
authorized by the MAC and is shown as the 3rd position code of the SMR code.
(9) 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, module (component or
assembly), end item, or system.
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 or 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 for 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
(i.e., DMWR). 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 (hours/miles, etc.) considered in classifying Army equipment/components.
c. Explanation of Columns in the MAC
(1) Column 1, Group Number. Column 1 lists functional group code numbers, the purpose of which is to identify
maintenance significant components, assemblies, subassemblies, and modules with the next higher assembly.
End item group numbers are 00.
(2) Column 2. Component/Assembly. Column 2 contains the names of components, assemblies, subassemblies,
and modules for which maintenance is authorized.
(3) Column 3, Maintenance Function. Column 3 lists the functions to be performed on the item listed in Column 2.
(For detailed explanation of these functions, see paragraph b. above)
(4) Column 4. Maintenance Level. Column 4 specifies, by the listing of a work time figure (expressed as man-
hours shown as whole hours or decimals) in the appropriate subcolumn(s), the level of maintenance authorized to
perform the function listed in Column (3). This figure represents the active time required to perform that
maintenance function at the indicated level of maintenance. If the number or the complexity of the tasks within the
listed maintenance function vary at different maintenance levels, appropriate work time figures will be shown for
each level. The work time figure represents the average time required to restore an item (assembly,