TM 5-4520-256-14
B-2. MAINTENANCE FUNCTIONS - Continued.
f.
Calibrate. To determine and cause corrections to be made or to be adjusted to instruments or 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.
g.
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.
h.
Replace. To remove and unserviceable item and install a serviceable counterpart in its place. "Replace" is
authorized by the MAC and is shown as the 3rd position code of the SMR code.
i
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.
B-3. EXPLANATION OF COLUMNS IN THE MAC, SECTION II.
a.
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. End item group numbers shall be "00".
b.
Column 2, Component/Assembly. Column 2 contains the names of components, assemblies, subassemblies,
and modules for which maintenance is authorized.
1
Services Inspect, test, service, adjust, align, calibrate, and/or replace.
2 Fault locate/troubleshoot The process of investigating and detecting the cause of equipment malfunctioning; the act of
isolating a fault within a system or unit under test (UUT).
3
Disassemble/Assemble Encompasses the step-by-step taking apart (or breakdown) of a spare/functional group coded
item to the level of its least componency identified as maintenance significant (i. e. assigned an SMR code) for the
category of maintenance under consideration.
4
Actions Welding, grinding, riveting, straightening, facing, remachining, and/or resurfacing.
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