TM-9-2350-247-20-3 Unit Maintenance Manual Volume 3 M548A1 M548A3 Tracked Cargo Carrier Download
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TM 9-2350-247-20-3 MAINTENANCE ALLOCATION CHART (MAC) 0540 00 0540 00-1 INTRODUCTION GENERAL This section provides a general explanation of all maintenance and repair functions authorized at various maintenance levels. The Maintenance Allocation Chart (MAC) (immediately following this introduction) designates overall authority and responsibility for the performance of maintenance functions on the identified end item or component. The application of the maintenance functions to the end item or component will be consistent with the capacities and capabilities of the designated maintenance levels. They are: Unit – includes two subcolumns, C (operator/crew) and O (unit) maintenance. Direct Support – includes an F subcolumn. General Support – includes an H subcolumn. Depot – includes a D subcolumn. The tools and test equipment requirements (immediately following the MAC) list the tools and test equipment (both special tools and common tool sets) required for each maintenance function as referenced from the MAC. The remarks (immediately following the tools and test equipment requirements) contain supplemental instructions and explanatory notes for a particular maintenance function. MAINTENANCE FUNCTIONS Maintenance functions are limited to and defined as follows: (1) 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). (2) Test. To verify serviceability by measuring the mechanical, pneumatic, hydraulic, or electrical characteristics of an item and comparing those characteristics with prescribed standards on a scheduled basis, i.e., load testing of lift devices and hydrostatic testing of pressure hoses. (3) Service. Operations required periodically to keep an item in proper operating condition, i.e., to clean (includes decontaminate, when required), to preserve, to drain, to paint, or to replenish fuel, lubricants, chemical fluids, or gasses. This includes scheduled exercising and purging of recoil mechanisms. (4) Adjust. To maintain or regulate, within prescribed limits, by bringing into proper or exact position, or by setting the operating characteristics to specified parameters. (5) Align. To adjust specified variable elements of an item to bring about optimum or desired performance. (6) Calibrate. To determine and cause corrections to be made or to be adjusted on instruments of test, measuring, and diagnostic equipment 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. (7) 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. (8) 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 third position code of the Source, Maintenance and Recoverability (SMR) code. (9) 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. Change 1