TM 55-1520-240-23-11f.Calibrate. To determine and cause corrections to be made or to be adjusted on instruments or test,measuring, and diagnostic equipment used in precision measurement. Consists of comparisons of twoinstruments, one of which is a certified standard of known accuracy, to detect and adjust any discrepancy inthe 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 orassembly) for an unserviceable counterpart.i.Repair. the application of maintenance services or other maintenance actions to restore serviceability to anitem by correcting specific damage, fault, malfunction, or failure in a part, subassembly, module (componentor assembly), end item, or system.j.Overhaul. That maintenance effort (service/action) necessary to restore an item to a completelyserviceable/operational condition as prescribed by maintenance standards in appropriate technicalpublications (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 likenew condition in accordance with original manufacturing standards. Rebuild is the highest degree of materielmaintenance applied to Army equipment. The rebuild operation includes the act of returning to zero thoseage measurements (hours/miles. etc.) considered in classifying Army equipments/components.B-4. STANDARD GROUPS (COLUMNS 1 AND 2).The standard groupings shown in the sample below are used, as applicable, throughout this MAC. Maintenancemanuals and RPSTL will reflect these standard groupings as individual chapters, with sections in each chapterrelative to the individual complete systems, subsystems, modules, components, assemblies, or specific parts noted.GROUPNUMBERDESCRIPTION01Aircraft General02Airframe System03Alighting Gear04Powerplant Installation05Blades/Rotor Systems06Train Systems07Hydraulic Systems08Instrument Systems09Electrical System10Fuel System11Flight Controls System12Utility System13Environmental Control System14Hoists and Winches15Auxiliary Powerplant System16Mission Equipment17Emergency EquipmentNO BREAK - WORK HARDERNO BREAK - WORK HARDERNO BREAK - WORK HARDER1.Ser vice - respect test, service adjus t, align c alibrate, or replace2.Actions - w elding, grinding, riveting, straightening, fac ing, remachining, or resurfacingB-5
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