extruded into tube shape to a desired size. It is covered
TYPES OF HOSE
with stainless steel wire, which is braided over the tube
There are two basic types of hose used in military
for strength and protection. The advantages of this hose
aircraft and related equipment. They are synthetic
are its operating temperature range, its chemical
rubber and polytetrafluoroethylene, commonly known
inertness to all fluids normally used in hydraulic and
as Teflon or PTFE.
engine lubrication systems, and its long life. At this
time, only medium-pressure and high-pressure types
Synthetic Rubber Hose
are available. These are complete assemblies with
factory-installed end fittings. The fittings may be either
Synthetic rubber hose has a seamless synthetic
the detachable type or the swaged type. When failures
rubber inner tube covered with layers of cotton and wire
occur, replacement must be made on a complete
braid, and an outer layer of rubber impregnated cotton
assembly basis.
braid. The hose is provided in low-, medium-, and
Teflon hose is identified by metal bands or pliable
high-pressure types.
plastic bands at the ends and at 3-foot intervals. These
bands contain the hose military specification number,
Teflon Hose
size indicated by a dash (--) and a number, operating
pressure, and the manufacturer's federal supply code
T h e Te f l o n h o s e i s m a d e u p o f a
number. Refer to figure 10-2.
tetrafluoroethylene resin, which is processed and
Figure 10-2.--Synthetic rubber hose identification.
10-2
