CHAPTER 5
HOSE FABRICATION AND MAINTENANCE
Chapter Objective: Upon completion of this chapter, you will have a working
knowledge of the fabrication and maintenance of aircraft hydraulic and pneumatic
hoses and their associated hardware.
You are responsible for maintaining a portion of
the hundreds of feet of fluid and air lines and various
hardware and seals found in modern-day aircraft. The
maintenance of these lines frequently involves
fabrication and replacement of hose and hose
assemblies. To be able to select the proper type of
hose and hose assemblies and their hardware, you will
need a basic knowledge of the type, size, and material
from which items are to be made.
HOSE AND HOSE ASSEMBLIES
Learning Objective:
Identify the various
types of hose, hose assemblies, hardware,
tools, and equipment used on naval aircraft.
Hose assemblies are used to connect moving parts
with stationary parts and in locations subject to severe
vibration.
Hose assemblies are heavier than
aluminum-alloy tubing and deteriorate more rapidly.
They are used only when absolutely necessary. Hose
assemblies are made up of hose and hose fittings. A
hose consists of multiple layers of various materials.
An example of the hose most often used in
medium-pressure applications is shown in figure 5-1.
TYPES OF HOSE
There are two basic types of hose used in military
aircraft and related equipment. They are synthetic
rubber and polytetrafluoroethylene, commonly
known as Teflon@ or PTFE.
Bulk hose identification will vary with the
materials from which the hose is constructed. It is
important that you are able to clearly identify the
proper hose to be used by recognizing the various
hose markings.
Figure 5-1.—Medium pressure synthetic rubber hose, MIL-H-8794.
5-1
