AIR
FORCE T033A1-13-496-1
NAVE LEX
0969-LP-1
70-0010
Introduction
to
IPB
SECTION
VII
ILLUSTRATED
PARTS
BREAKDOWN
INTRODUCTION
7.1
GENERAL.
The
Illustrated Parts
Breakdown
(IPB)
covering the AN/USM-425(V)1
oscilloscope,
lists and
illustrates the
assemblies,
subassemblies and
detail parts
installed at the
time the
end item(s) was
manufactured.
If an
assembly or part
(including
vendor items), which is
different
from the
original, is installed
during the manu-
facture of
later oscilloscopes, all
assemblies and parts
will
be
listed (and
"Usable On" coded). However, when the
original assembly
or part does
not have continued appli-
cation (no
spares of the original
were procured or such
spares are no
longer authorized
for replacement),
only
the
preferred assembly or
part
is
listed.
Interchangeable and
substitute
assemblies
and parts, subsequently
authorized
by
the
Government, are
not
listed in this
manual; such
items
are
identified by
information available through
the
Interchangeable and
Substitute (I & S) Data Systems.
Refer
to
TO
00-25-184.
When
a
standard size part can
be
replaced with
an oversize or
undersize
part,
the latter parts,
showing sizes, are also
listed. Repair Parts Kits
and Quick
Change Units are listed when
available. The intended use
of the
Illustrated Parts Breakdown
is for identifying, re-
quisitioning, stocking,
and issuing of replacement parts.
This
IPB
is divided into
the following sections.
a.
Section
VII
—
Introduction
b.
Section VIII
—
Maintenance
Parts
List
c.
Section IX
—
Numerical Index
d. Section X
—
Reference Designation Index
7-2.
INTRODUCTION.
Section
VII
includes
general
information,
specific
information
pertaining to
in-
dividual
sections,
directions for
use of the
IPB, abbre-
viations, manufacturer's
federal
supply codes
and
addresses,
and source code
definitions.
7-3.
MAINTENANCE
PARTS LIST
INTRO-
DUCTION. Section VIII
contains the
complete
Main-
tenance
Parts List breakdown separated into
figures by
main groups
and assemblies,
and keyed to
associated
il-
lustrations
by figure and index numbers.
The relation
of
each
part
to
its
next higher assembly,
or main group,
is
shown either
by indention (paragraph 7-4) or by
figure
cross reference
notes
(paragraph
7-5).
7-4.
INDENTION. Parts listed in the Maintenance
Parts List are indented
to
indicate
item
relationship or next
higher assembly
(NHA). The nomenclature
of each assem-
bly is followed
in
the list (except for attaching parts)
by
the nomenclature of its components indented one
column
to the right. This indention indicates the relationship
of
the component
to
the assembly.
To determine the next
higher
assembly
of
a part or assembly, note the
column in
which the first word of
the
nomenclature
begins. Then
the
first item
directly
above, which
appears one column
to
the left
(except for attaching parts), is the
next higher
assembly.
7-5.
FIGURE CROSS REFERENCE NOTES.
The
continuity of parts breakdown lists and their relation-
ship
to
the complete assemblies is maintained
by a
figure
cross
reference note following the nomenclature of the item
being referenced, as
follows:
a.
"See figure for breakdown,"
following the
description of
a
part number indicates that the
complete or
continued detailed
breakdown
for the item noted may be
found in the referenced figure.
b. "NHA figure
,"
following the description
of a
part number indicates
that the item noted may
be
found in the figure referenced, with
its
requirements
and
relationship
to its
next higher assembly indicated
by col-
umn indention (NHA means next higher
assembly).
7-6.
SIMILAR
ASSEMBLIES. Similar assemblies
are combined
and listed only once. Common
parts
are
listed
with the quantity for
one
assembly.
Peculiar parts
are listed and noted
with their associated assembly in the
description column.
7-7.
ATTACHING
PARTS.
Screws,
nuts,
bolts*
etc., which serve as attaching
parts, are
listed
immediatly
following, and with the same
indention
as
the item they
attach. They may or may
not have an index number
as-
signed. These attaching parts_are
listed in disassembly
sequence
and are not considered components of the item
that they
attach. The abbreviation
(AP) following
the
de-
scription of
a
part
identifies
that part as
an attaching part.
7-1
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