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Appendix B: MAINTENANCE ALLOCATION CHART - TM-9-2350-238-20-20397
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TM-9-2350-238-20-2 Crane (CAB) Components Recovery Vehicle Full-Tracked: Light Armored M578 (
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SECTION III: EXPLANATION OF COLUMNS IN TOOL AND TEST EQUIPMENT REQUIREMENTS,
TM
9-2350-238-20-2
M A I N T E N A N C E FUNCTIONS
(CONT).
B-2.
f. C a i b r a t e . T o d e t e r m i n e a n d c a u s e c o r r e c t i o n s t o b e m a d e o r t o b e a d j u s t e d o n i n s t r u m e n t s
or
test,
measuring,
and
diagnostic
equipments
used
in
precision
measurement.
Consists
of
com-
parisons
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. R e m o v e / I n s t a l l . 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 a posi-
tion a spare, repair part, or module (component or assembly) in a manner to allow the proper
functioning of an equipment or system.
h. R e p l a c e . 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
SMR  code.
i. R e p a i r . T h e a p p l i c a t i o n o f m a i n t e n a n c e s e r v i c e s2 , i n c l u d i n g
l o c a t i o n / t r o u b l e s h o o t i n g3 ,
fault
r e m o v a l / i n s t a l l a t i o n , a n d d i s a s s e m b l y / a s s e m b l y4 p r o c e d u r e s ,
a c t i o n s5 t o
and
maintenance
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. 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 r e s t o r e a n i t e m t o a c o m -
pletely  serviceable/operational  condition  as  required  by  maintenance  standards  in  appropriate
technical  publications  (i.e., DMWR).  Overhaul  is  normally  the  highest  degree  of  maintenance  per-
formed
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 h e r e s t o r a t i o n o f u n s e r v i c e a b l e
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  (hours/miles,  etc.)  considered  in
classifying Army equipment/components.
B-3. EXPLANATION OF COLUMNS IN THE MAC, SECTION II.
a. C o l u m n 1 , G r o u p N u m b e r . C o l u m n 1 l i s t s f u n c t i o n a l g r o u p c o d e n u m b e r s , t h e p u r p o s e o f
which is to identify maintenance significant components, assemblies, subassemblies, and
modules with the next higher assembly. End item group number shall be ″ 0 0 ″ .
b. C o u m n  2 ,  C o m p o n e n t / A s s e m b l y .  Column  2  contains  the  names  of
components,
assem-
blies,  subassemblies,  and  modules  for  which  maintenance  is  authorized.
2
Services­inspect,  test,  service,  adjust,  aline,  calibrate,  and/or  replace.
3
Fault location/troubleshooting--the process of investigating and detecting the cause of equip-
ment malfunctioning; the act of isolating a fault within a system or unit under test (UUT).
4
Disassembly/assembly--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  level  of  maintenance  under  consideration.
5
Actions--welding,  grinding,  riveting,  straightening,  facing,  remachining,  and/or  resurfacing.
B-2

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