TM 9-1005-237-23&P
B-2. 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 comparisons of two instruments, one of which is a cert-
ified 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 counter-
part in its place. “Replace” is authorized by the MAC and is shown as the 3d
position code of the SMR code.
i.
Repair. The application of maintenance services*, including fault location/
trouble-shooting*, 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.
j.
Overhaul. That maintenance effort (service/action) prescribed to restore an
item to a completely serviceable/operational condition as required by mainte-
nance 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 services/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 materiel maintenance
applied to Army equipment. The rebuild operation includes tile act of returning
to zero those age measurements (hours/miles, etc.) considered in classifying
Army equipment/components.
B-3. EXPLANATION OF COLUMNS IN THE MAC, SECTION II.
a. Column 1, Group Number. Column I 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 number
shall be “00”.
*Services-inspect, test, service, adjust, aline, calibrate, and/or replace.
*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). *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. *Actions--
welding, grinding, riveting, straightening, facing, remachining, and/or
resurfacing.
B-2
