All hose assemblies are identified by tags, bands,
or tapes. Some identifications are permanently
marked while others are removable. Removable tags,
bands, or tapes should not be installed on hose
assemblies located inside fuel and oil tanks or in areas
of an aircraft where tags, bands, or tapes could be
drawn into the engine intake. Hose assemblies are
either commercially manufactured or locally
fabricated.
COMMERCIALLY MANUFACTURED
HOSE ASSEMBLIES
Commercially manufactured hose assemblies are
made from synthetic rubber or Teflon®. The
assemblies are identified by a band near one end of the
assembly. This band identities the assembly manufac-
turer’s code or trademark and military specification (MS)
part number, including dash size, operating pressure (in
pounds per square inch, psi), date of assembly (in quarter
and year), hose manufacturer’s code number (if different
from assembly manufacturer), and the cure date of the
hose manufacturer (in quarter and year).
The assembly date is indicated by the letter A,
followed by the quarter of the year, the letter Q, and
ends with the last two digits of the year. For example,
hose assemblies fabricated during June 1980 are
marked A2Q80. When a decal or band is used that
states "assembly date," the A may be omitted.
Assembly date information is also indicated on the
unit, intermediate, and shipping containers containing
a single item.
Exterior
contain major assemblies
shipping containers that
made up of two or more
assemblies with rubber items are identified by the
oldest assembly in the container.
Commercially manufactured Teflon® hose
assemblies are identified by a permanently marked and
attached band on the assembly. The band contains the
assembly manufacturer’s name or trademark; hose
manufacturer’s federal supply code number; hose
assembly part number; operating pressure-in psi,
pressure test symbol (PT), and the date of hose assembly
manufacture (in month and year).
LOCALLY FABRICATED HOSE
ASSEMBLIES
Hose assemblies manufactured by depot and
intermediate maintenance activities are identified
with hose assembly identification tags or labels. The
hose assembly identification tag is a metal tag that
contains the basic hose assembly and part number,
date of fabrication (in quarter and year), operating
pressure (in psi), and organizational code of the
activity fabricating the hose assembly. Figure 5-5
shows where this information is located All marking
of the tag is to be done prior to its attachment to the
hose assembly.
Install the hose assembly identi-
fication tag by wrapping the band snugly around the
hose, inserting the tab through the slot and pulling it
tight; crimp the tab after bending the tab back; and
finally, cut away the excess tab after crimping. A
length of not less than one-half inch must remain
between the tag and the end fitting after proof
pressure testing has been performed. Proof pressure
testing is discussed later in this chapter.
Figure 5-5.—Hose assembly identification tags.
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