TM 9-2350-247-20-3MAINTENANCE ALLOCATION CHART (MAC)—Continued 0540 00NOTEThe 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 ofequipment malfunctioning; the act of isolating a fault within a system or Unit Under Test(ET).• Disassembly/assembly — The step-by-step breakdown (taking apart) of a spare/functionalgroup coded item to the level of its least component, that is assigned an SMR code for thelevel of maintenance under consideration (i.e., identified as maintenance significant).• Actions — Welding, grinding, riveting, straightening, facing, machining, and/or surfacing.(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 isnormally the highest degree of maintenance performed by the Army. Overhaul does not normally return an item tolike new condition.(11) Rebuild. Consists of those services/actions necessary for the restoration of unserviceable equipment to a like newcondition in accordance with original manufacturing standards. Rebuild is the highest degree of materialmaintenance applied to Army equipment. The rebuild operation includes the act of returning to zero those agemeasurements (e.g., hours/miles) considered in classifying Army equipment/components.Explanations of Columns in the MACColumn (1) — Group Number. Column (1) lists FGC numbers, the purpose of which is to identify maintenance significantcomponents, assemblies, subassemblies, and modules with the Next Higher Assembly (NHA).Column (2) — Component/Assembly. Column (2) contains the item names of components, assemblies, subassemblies, andmodules 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 adetailed 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 listedin column (3), by indicating work time required (expressed as man-hours in whole hours or decimals) in the appropriatesubcolumn. This work time figure represents the active time required to perform that maintenance function at the indicatedlevel of maintenance. If the number or complexity of the tasks within the listed maintenance function varies at differentmaintenance levels, appropriate work time figures are shown for each level. The work time figure represents the average timerequired to restore an item (assembly, subassembly, component, module, end item, or system) to a serviceable condition undertypical 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 tasksidentified for the maintenance functions authorized in the MAC. The symbol designations for the various maintenance levelsare as follows:C — Operator or crew maintenanceO — Unit maintenanceF — Direct support maintenanceH — General support maintenanceD — Depot maintenanceColumn (5) — Tools and Equipment Reference Code. Column (5) specifies, by code, those common tool sets (not individualtools), common Test, Measurement and Diagnostic Equipment (TMDE), and special tools, special TMDE, and special supportequipment 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, that is keyed to theremarks table entries.0540 00-2
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