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TM 10-3930-643-20
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 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 q odule
(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 is shown as
the 3d position code of the SMR code.
i . R e p a i r.
The application of maintenance services1,
including fault
location/troubleshooting2, removal/installation, and disassembly/assembly3,
procedures,
and maintenance actions4
t o i d e n t i f y t r o u b l e s a n d r e s t o r e
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 . O v e r h a u l . T h a t m a i n t e n a n c e e f f o r t ( s e r v i c e / a c t i o n ) p r e s c r i b e d t o
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 . R e b u i l d . C o n s i s t s o f t h o s e s e r v i c e s / a c t i o n s n e c e s s a r y f o r t he
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
the act of returning to zero those age measurements (hours/miles, etc.)
considered in classifying Army equipment/components.
1
S e r v i c e s - i n s p e c t , t e s t , s e r v i c e , a d j u s t , a l i n e , c a l i b r a t e , a n d / or
r e p l a c e.
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/assemble-encompasses
t h e s t e p - b y - s t e p t a k i n g a p a r t ( 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, remachinery,
and/or resurfacing.
B-2
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