Figure 5-15.—Firesleeve.
cause a work stoppage, fabrication by depot and
intermediate maintenance is authorized.
PROTECTIVE FIRESLEEVES.—Some hose
assemblies are located in areas where temperatures
exceed the capabilities of the hose material. Protec-
tive firesleeves should be installed (fig. 5-15) over
these hose assemblies. Fire sleeves do not increase
the service temperature of hoses, but protect the hose
from direct fire long enough to allow the appropriate
action to be taken. The sleeve is composed of fiber-
glass. It is impregnated and overlaid with a flame-
resistant silicone rubber.
Cleaning
Fabricated hose assemblies should be cleaned and
visually inspected for foreign material before and
after proof testing.
Cleaning should be done with
cleaning fluid or a detergent solution.
In cleaning hose or hose assemblies, the cleaning
procedures used depend upon the cleaning material
selected for cleaning. See table 5-3. The preferred
cleaning method is one that also uses the preferred
cleaning material, P-D-680, type II. Note the
CAUTION before
cleaning process.
reading the steps used in the
CAUTION
Oxygen hose assemblies must be cleaned
and tested by qualified aviation equipment
personnel in accordance with NAVAIR
13-1-6-4 before installation in weapons
systems. P-D-680, type II solvent is
flammable and its vapors are toxic. Keep
P-D-680 solvents away from open flames,
and use only in a well-ventilated area.
Avoid solvent contact with skin.
Immerse or flush the hose or hose assembly using
P-D-680, type II, solvent or equivalent. Brush the
exterior of the hose or hose assembly with a nylon or
similar synthetic bristle brush that has a corrosion-
resistant core. Brush the core and at least the first
inch of hose with a brush that has a diameter of at
least 1/16 inch larger than the fitting bore. Flush the
hose or hose assembly with P-D-680, type II, or
equivalent. Drain the cleaning fluid and blow-dry
with dry, filtered, oil-free air or nitrogen. Install the
protective closures if the hose or hose assembly is not
to be cleaned further or proof tested immediately.
Proof Pressure Testing
Hose assemblies must be proof pressure tested
after fabrication.
Ballistic and oxygen hose
assemblies must be cleaned and tested by qualified
aviation equipment personnel in accordance with
NAVAIR 13-1-6-4 before installation in weapons
systems.
Observe all safety rules when you proof pressure
test hose assemblies, and proceed as follows to proof
pressure test hose assemblies. Clean hose assembly.
Table 5-3.—Alternate Cleaning Fluids for Teflon® Hose or Hose Assemblies
5-15
