EXPLANATION OF COLUMNS IN THE MAC, SECTION Il.

Appendix B MAINTENANCE ALLOCATION CHART (MAC)

EXPLANATION OF COLUMNS IN TOOL AND TEST EQUIPMENT REQUIREMENTS.SECTION Ill.

TM-9-6115-464-12 Wrench Impact Hydraulic Model MV-12-140T Manual
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ARMY TM 9-6115-464-12 AIR FORCE TO 35C2-3-445-1 NAVY NAVFAC P-8-624-12 i. Repair. The application of maintenance services including fault location/troubleshooting², removal/ installation, and disassembley/assembly³procedures, and maintenance actions⁴to 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. j. 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. k. Rebuild. Consists of those services/actions necessary for the restoration of unserviceable equip- ment to a like new conditon 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. B-3 EXPLANATION OF COLUMNS IN THE MAC, SECTION Il. a. 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. b. Column 2, Component Assembly. Column 2 contains the item names of components, assemblies, subassemblies, and modules for which maintenance is authorized. c. 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-2.) d. 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 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, subas- sembly, component, module, end item, or system) to a serviceable conditon under typical field operating cond- tions. This time includes preparation time (including any necessary disassembly/assembly time), the trouble- shooting/fault location time, and quality assurance time in additon to the time required to perform the specific tasks identified for the maintenance functions authorzied in the maintenance allocation chart. The symbol des- ignations for the various maintenance levels are as follows: C . . . . O . . . . F . . . . L . . . . H . . . . D . . . . Operator maintenance Unit maintenance Direct support maintenance Specialized Repair Activity (SRA)⁵ General support maintenance Depot maintenance ¹Services - Inspect, test, service, adjust, align, calibrate, and/or replace. ²Fault 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). ³Disassembly/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.) ⁴Actions - Welding, grinding, riveting, straightening, facing, machining, and/or resurfacing. ⁵This maintenance level is not included in Section 11, column (4) of the Maintenance Allocation Chart. Functions to this level of maintenance are identified by a work-time figure in the "H" column of Sec- tion II, column (4), and an associated reference code is used in the Remarks column (6). This code is keyed to Section IV, Remarks, and the SRA complete repair application is explained there. B-2

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