TM 10-4320-344-24APPENDIX BMAINTENANCE ALLOCATION CHART (MAC)SECTION 1.INTRODUCTIONB.1 THE ARMY MAINTENANCE SYSTEM MAC.B.1.1 Introduction.This introduction (Section I) provides a general explanation ofall levels of maintenance and repair functions authorized at various maintenancelevels under the standard Army Maintenance System concept.B.1.2 MaintenanceAllocationChartSectionII.The Maintenance Allocation Chart (MAC) insection II designates overall authority and responsibility for the performance ofmaintenance functions on the identified end item or component.The application ofthe maintenance functions to the end item or component will be consistent with thecapacities and capabilities of the designated maintenance levels, which are shown onthe MAC in column (4) as:U n i t includes two subcolumns, C (operator/crew) and O (unit)maintenanceDirect support - includes an F sub-columnGeneral support - includes an H sub-columnDepot - includes a D sub-columnB.1.3 Tools and Test Equip ment Introduction.Section III lists the tools and testequipment (both special tools and common tool sets) required for each maintenancefunction as referenced from section II.B.1.4 SupplementalInstructionsIntroduction.Section IV contains supplementalinstructions and explanatory notes for a particular maintenance function.B.2 MAINTENANCEFUNCTIONS.Maintenance functions are limited to and defined as follows:B.2.1 Inspect.To determine the serviceability of an item by comparing its physical,mechanical, and/or electrical characteristics with established standards throughexamination (e.g., by sight, sound, or feel) .B.2.2 Test.To verify serviceability by measuring the mechanical, pneumatic,hydraulic, or electrical characteristics of an item and comparing thosecharacteristics with prescribed standards.B.2.3 Service.Operations required periodically to keep an item in proper operatingcondition, i.e., to clean (includes decontaminate, when required), to preserve, todrain, to paint, or to replenish fuel, lubricants, chemical fluids, or gases.B.2.4 Adjust.To maintain or regulate, within prescribed limits, by bringing intoproper or exact position, or by setting the operating characteristics to specifiedparameters.B.2.5 Align.To adjust specified variable elements of an item to bring about optimumor desired performance.B.2.6 Calibrate.To determine and cause corrections to be made or to be adjusted oninstruments or test, measuring, and diagnostic equipment used in precisionmeasurement.Consists of comparisons of two instruments, one of which is acertified standard of known accuracy, to detect and adjust any discrepancy in theaccuracy of the instrument being compared.B-1
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