repaired, providing the damages are within specified limits. If tube
damages are extensive or exceed repair limitations, a tube splice can
be installed as a temporary repair measure.
PART B - HOSE
Hose, flexible line, is used in aircraft plumbing whenever the
connected components must be free to move, or wherever extreme
vibrations are a problem.
This part deals with the different types
of hose used on Army aircraft, the materials from which they are
manufactured, and the methods of fabricating hose assemblies.
Also
explained are the proper methods of hose installation and the
requirements for storing the different types of hose.
Hose
assemblies are used to conduct air, fuel, engine oil, hydraulic
fluid, water, and antifreeze. Hose pressure capabilities range from
vacuums found in some instrument lines to several thousand psi found
in some hydraulic systems. Hose assemblies, however, are never used
in aircraft oxygen systems.
TYPES OF HOSE
Aircraft hose is composed of two or more layers of differing
materials.
The inner layer, or liner, is a leak-tight nonmetallic
tube made from either synthetic rubber or teflon.
The liner is
reinforced against swelling or bursting by one or more outer layers
of braid that encircle it.
The kind and number of layers of braid
depend on the intended operating pressure range of the hose assembly.
The two materials used as inner liner for flexible hoses are
synthetic rubber and teflon.
The two materials and their uses are
discussed in the paragraphs that follow.
Rubber Hose.
The inner liner of rubber hose used in aircraft
plumbing systems is made of synthetic rubber.
Various compounds of
rubber are used for these inner liners.
Each compound provides the
hose with some special capability, such as usability with certain
fluids or operability within certain ranges of temperature.
The
outer covering of rubber hose is made of either fabric or rubber.
Rubber hose is used in aircraft plumbing systems only in the form
of assemblies.
An assembly is formed by attaching metal end
connections to each end of a section of bulk hose.
Teflon
Hose.
Teflon
is
the
registered
name
for
tetrafluoroethylene, which is a synthetic resin.
Teflon hose has a
flexible leak-proof inner tube, reinforced on the outside with one or
more layers of stainless steel braid. The teflon
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