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ARMY TM 9-2815-253-24 AIR FORCE TO 38G1-93-2 MARINE CORPS TM 2815-24/3 APPENDIX B MAINTENANCE ALLOCATION CHART (MAC) SECTION I. INTRODUCTION B-1.  GENERAL. a. This  section  provides  a  general  explanation  of  all  maintenance  and  repair  functions  authorized  at  various maintenance categories. b. The Maintenance Allocation Chart (MAC) in SECTION II designates overall authority and responsibility for the performance of maintenance functions on the diesel engine and its components.  The application of the maintenance functions to the engine components will be consistent with the capacities and capabilities of the designated maintenance categories. c. SECTION  III  lists  the  tools  and  test  equipment  (both  special  tools  and  common  tool  sets)  required  for  each maintenance function as referenced from SECTION II. d. SECTION IV contains supplemental instructions and explanatory notes for a particular maintenance functions. B-2.  MAINTENANCE FUNCTIONS.  Maintenance functions will be limited to and defined as follows: a. Inspect.    To  determine  the  serviceability  of  an  item  by  comparing  its  physical,  mechanical,  and/or  electrical characteristics with established standards through examination (e.g., by sight, sound, or feel). b. Test.  To verify serviceability by measuring the mechanical, pneumatic, or electrical characteristics of an item and comparing those characteristics with prescribed standards. c. Service.  Operations required periodically to keep an item in proper operating condition; i.e., to clean (include decontaminate, when required), to preserve, to drain, to paint, or to replenish fuel, lubricants, chemical fluids, or gases. d. Adjust.  To maintain or regulate, within prescribed limits, by bringing into proper or exact position, or by setting the operating characteristics to specified performance. e. Align.  To adjust specified variable elements of an item to bring about optimum or desired performance. f. Calibrate.  To determine and cause corrections to be made or to be adjusted on instruments or Test, Measuring, and Diagnostic Equipment (TMDE) used in precision measurement.  Consists of comparisons of two instruments, one of which is a certified standard of known accuracy, to detect and adjust any discrepancy in the accuracy of the instrument being compared. g. Remove/Install.  To remove and install the same item when required to perform service or other maintenance functions.  Install may be the act of emplacing, seating, or fixing into position a spare, repair part, or module (component or assembly) in a manner to allow the proper functioning of an equipment or system. h. Replace.    To  remove  an  unserviceable  item  and  install  a  serviceable  counterpart  in  its  place.    "Replace"  is authorized by the MAC and is shown as the 3rd position code of the SMR code. i. 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. 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 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 (hours/miles, etc.) considered in classifying Army equipment/components. Change 1  B-1


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