ARMY  TM  5-6675-238-14 MARINE CORPS TM 08839A-14/1 APPENDIX  D MAINTENANCE  ALLOCATION  CHART Section I. INTRODUCTION D-1. General. a.  This  appendix  lists  the  maintenance  operations for  the  PADS  Test  Set,  AN/USM-427,  LIN  T83225, NSN  6675-01-081-9198.  It  authorizes  categories  of maintenance functions for specific maintenance func- tions on repairable items and components, and the tools and equipment required to perform each function. This appendix may be used as an aid in planning mainte- nance  operations. b.  The  Maintenance  Allocation  Chart  (MAC)  in Section II designates the overall responsibility for the performance  of  maintenance  functions  on  each  item  or component.  Implementation  of  the  maintenance  forma- tions  will  be  consistent  with  the  assigned  maintenance functions. c. Section III lists the special tools and test equip- ment required for each maintenance function as refer- enced in Section II. d.  Section  IV  contains  supplemental  instructions and  explanatory  notes  for  particular  maintenance  func- tions. D-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. b. Test.  To  verify  serviceability  and  detect  incipient failure  by  measuring  the  mechanical  or  electrical  char- acteristics  of  an  item  and  comparing  those  characteris- tics  with  prescribed  standards. c. Service.  Operations  required  periodically  to  keep an  item  in  proper  operating  condition,  i.e.,  to  clean (decontaminate); to preserve; to drain; to paint; or to replenish  fuel,  lubricants,  hydraulic  fluids,  or  com- pressed  air  supplies. d. Adjust. To maintain within prescribed limits, by bringing into proper or exact position, or by setting the operating characteristics to specified parameters. 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 equipments used in precision measurement, Consists of comparisons of two instru- ments, 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. Install. The act of emplacing, seating, or fixing into position an item, part, or module (component or assembly) in a manner to allow the proper functioning of  an  equipment  or  system. h. Replace.  The  act  of  substituting  a  serviceable like type part, subassembly, or module (component or assembly)  for  an  unserviceable  counterpart. i. Repair. The application of maintenance services (inspect, test, service, adjust, align, calibrate, replace) or other  maintenance  actions  (welding,  grinding,  riveting, straightening, facing, remachining, or resurfacing), to restore serviceability to an item by correcting specific damage, fault, malfunction, or failure in a part, subas- sembly, module (component or assembly), end item, or system, j. Overhaul.  That  maintenance  effort  (service/ac- tion)  necessary  to  restore  an  item  to  a  completely serviceable/operational   condition   as   prescribed   by maintenance  standards,  i.e.,  DMWR,  in  appropriate technical publications. Overhaul is normally the highest degree of maintenance performed by the Army, Over- haul  does  not  normally  return  an  item  to  like  new condition. k. Rebuild.  Consists  of  those  services/actions  neces- sary for the restoration of unserviceable equipment to a like new condition in accordance with original manu- facturing  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. D-3. Maintenance Allocation Chart Column Entries, Section II. a. Columm 1: Group Number.  Column 1 lists the group numbers which identify components, assemblies, subassemblies, and modules with the next higher assem- bly, b. Column  2:  Component/Assembly.  Column 2 lists the  noun  names  of  components,  assemblies,  subassem- blies, and modules for which maintenance is authorized. D-1