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ARMY TM 9-2815-255-24 AIR FORCE TO 38G1-95-2 MARINE CORPS TM 2815-24/4 i. Repair.    The  application  of  maintenance  services1  including  fault  location/roubleshooting2,  removal/installation, and  disassembly/assembly3  procedures,  and  maintenance  actions4  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), and 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 in 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  service/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 and components. B-3.  EXPLANATION OF COLUMNS IN THE MAC, SECTION II. 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 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.) 1Service - Inspect, test, service, adjust, aline, 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 as SMR code for the level of maintenance under consideration (i.e., identification as maintenance significant). 4Actions - Welding, grinding, riveting, straightening, facing, machining, and/or resurfacing. B-2


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