TM 10-1670-305-23&P
MAINTENANCE ALLOCATION CHART (MAC) - CONT
0027 00
THE ARMY MAINTENANCE SYSTEM MAC - CONT
MAINTENANCE FUNCTIONS - CONT
f.
Calibrate. To determine and cause corrections to be made or to be adjusted on
instruments or test, measuring and diagnostic equipments used in precision
measurement. Consists of comparison 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 an unserviceable item and install a serviceable counterpart in its
place. “Replace” is authorized by the MAC and assigned maintenance level is shown as
the 3rd position code of the SMR code.
i.
Repair. The application of maintenance services1 including fault location/troubleshooting2,
removal/installation, and disassembly/assembly3 procedures, and maintenance actions4
to 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.
j.
Overhaul. That maintenance effort (service/action) prescribed to restore an item to a
completely serviceable/operational condition as required by maintenance standards in
appropriate technical publications (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 service/actions necessary for the restoration of unserviceable
equipment to a like new condition in accordance with original manufacturing standards.
Rebuild is the highest degree of material maintenance applied to Army equipment. The
rebuild operation includes the act of returning to zero those age measurements (e.g.
hours, miles) considered in classifying Army equipments/components.
`
1
Services – Inspect, test, service, adjust, align, calibrate, and/or replace.
2
Fault location/troubleshooting – 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
Disassembly/assembly – The step-by-step breakdown (taking apart) of a
spare/functional group coded item to the level of its least component, that is assigned
an SMR code for the level of maintenance under consideration (i.e., identified as
maintenance significant).
4
Actions – Welding, grinding, riveting, straightening, facing, machining, and/or
resurfacing.
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