linear is chemical inert to all fuel, oil, alcohol, water, acid, and
gas. The linear can withstand fluid temperatures ranging from -100 F
to + 500 F (-73 C to +260 C). Like rubber hose, teflon hose is used
in aircraft plumbing systems only as assemblies.
The type of material and the number of layers used as reinforcement
braid determine the pressure range of the hose.
The two pressure-
range classifications of aircraft hose are medium pressure and high
The medium-pressure range includes operating
pressures of 1,500 psi and below.
High-pressure hose is designated for operating
pressure systems up to but not exceeding 3,000 psi.
Aircraft hose and hose assemblies can be readily identified by
markings found either stenciled along the length of the hose or
imprinted on an affixed metal band. These markings include the date
of manufacture or fabrication, size, military specification number,
and date of pressure test, as illustrated in Figure 2-14.
Marking on Rubber Hose.
Bulk rubber hose has ink or paint
markings on its outer cover for identification.
provided by these markings include the identity of the manufacturer,
date made, size, and military specification number.
specification (MS) number provides additional information when
referenced with a specification table in chapter 7 of TM 1-1500-204-
This information includes the hose-pressure capability,