TM 55-1680-358-12&P
SECTION III. ILLUSTRATED PARTS BREAKDOWN
3-12. General. This Illustrated Parts Breakdown (IPB)
lists, illustrates, and describes the items necessary to
support and maintain the Helicopter Internal Cargo
Handling System, Part No. 18049 J 100, for the CH47
Helicopter. The purpose of this IPB is to assist
personnel
with
identification
and
for
establishing
relationships between parts.
3-13. Scope. The scope of the Illustrated Parts
Breakdown is as follows:
a.
General. This paragraph contains descriptive
and user information. It provides an overview on how to
use the Illustrated Parts Breakdown.
b.
Maintenance Parts List. This section contains a
breakdown of assemblies and parts. It also includes
keyed illustrations of the end items that can be
disassembled, repaired, obtained from reclamation,
supply
channels,
reinstalled,
replaced,
and
reassembled. The listings for specific systems,
components, groups, etc., are, when practical, in a
sequence compatible to the order in which such
systems, components, groups, etc., are discussed in the
maintenance sections. The Maintenance Parts List does
not contain:
(1)
Parts
and
assemblies
that
are
not
repairable or replaceable.
(2)
Parts which lose their identity by being
welded, sealed, or joined to other pieces as a permanent
assembly.
(3)
Parts made of bulk stock, such as lock
wire, bonding braid, upholstery, cloth, friction tape,
electrical wire, insulation, etc.
(4)
Support equipment, such as tools and test
equipment.
c.
Numerical Index. This section contains the part
numbers of all parts listed in the Maintenance Parts List.
3-14. Abbreviations and Symbols. The abbreviations
used in this Illustrated Parts Breakdown are in
accordance with Military Standard MII,STD-12.
3-15. Operation and Maintenance Data. Refer to
Chapter 2 and Chapter 3, Section II for operation and
maintenance instructions.
3-16. Indention. The items listed in the Maintenance
Parts List are indented to indicate item relationship or
next higher assembly (NHA). The description of each
assembly is followed immediately (except for attaching
parts) by the description of the detailed parts indented
one column to the right. This indention indicates the
relationship of the part to the assembly. To determine
the next higher assembly of a part or assembly, note the
column in which the first word of the description begins.
The first item directly above, which appears one column
to the left (except attaching parts) is the next higher
assembly.
3-17. Figure Cross-Reference Notes. The continuity
of the parts listed, and their relationship to the complete
assemblies
or
subassemblies
covered
by
the
Maintenance
Parts
List,
are
maintained
by
a
parenthetical figure cross-reference note following the
description of the part being referenced. These notes
are as follows:
a.
(See figure ... for breakdown.) This statement
indicates that the complete or continued detailed
breakdown of the part being referenced may be found in
the figure reference.
b.
(See figure ... for NHA.) This statement
indicates that the part being referenced may be found in
the figure reference, with requirements and relationships
to its next higher assembly indicated by column
indention.
3-18. Parts Listed. In general, the assemblies and
parts
installed
at
the
time
the
end
item
was
manufactured are listed and identified in this manual.
3-19. Attaching Parts. Screws, bolts, washers, nuts
and other items which serve as attaching parts are listed
immediately following, and with the same indention as
the components they attach. Attaching parts are not
listed in disassembly sequence and are not part of the
components they attach unless so indicated. The
caption (AP) appears in the description column following
these attaching parts.
3-3
