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Page Title: MAINTENANCE FUNCTIONS (continued)
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TM 9-2350-287-20-2 B-2.  MAINTENANCE  FUNCTIONS   (continued). f. 9. h. i. j. k. ~- CALIBRATE. To determine the accuracy of and cause corrections or adjustments to be made on instruments or test, measuring, and diagnostic equipment used in precision measurement. Calibration 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. ‘~ REMOVE/lNSTALL. 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 assembty)  in a manner to allow the proper functioning of an end item or system. 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. REPAIR. To apply maintenance services-including fault location/troubleshooting, removal/installation, and  disassembly/assembly  procedures-and  maintenance  actions  to  identify  troubles  and  restore serviceabilitytoan item by correcting specific damage, fault, malfunction, or failure in a part, subassembly, module (component or assembly), end item, or system. OVERHAUL. To perform that maintenance effort (service/action) required to restore an item to a completely senAceable/operational  condition as required by maintenance standards in an appropriate technical publication (i.e., depot maintenance work requirement). Overhaul is normally the highest degree of maintenance performed by the Army. Overhaul does not normally return an item to like-new condition. REBUILD. To perform those services/actions necessary for the restoration of unserviceable equipment ~ toa Iike-newcondition  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 tozemthoseage measurements (hours/miles, etc.) considered inclassifyingArmy  equipment/components, B-3.  EXPLANATION  OF  COLUMNS  IN  THE  MAC,  SECTION  II. a. b. c. d. COLUMN 1, GROUP NUMBER. Column 1 lists functional group code numbers, the purpose of which is to identify maintenance-significant components, assemblies, subassemblies, and modules with the next higher assembly. The end item group number shall be “00.” COLUMN  2,  COMPONENT/ASSEMBLY.  Column  2  contains  the  name  of  components,  assemblies, subassemblies, and modules for which maintenance is authorized. COLUMN 3, MAINTENANCE FUNCTION. Column 3  Iiststhe  functions to be performed on the item listed in column 2. COLUMN 4, MAINTENANCE LEVEL. Column 4 specifies, by the listing of a work time figure in the appropriate subcolumn(s),  the level of maintenance authorized to perform the function listed in Column 3. This figure represents the active time required to perform that maintenance function at the indicated ~ level of maintenance. If the number or complexity of the tasks within the listed maintenance function vary at different maintenance levels, appropriate work time figures will be shown for each level. The work time figure represents the average time required to restore an item (assembly, subassembly, component, module, end item, or system) to a serviceable condition under typical field operating conditions. This time ~ B-2

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