Table 10-1.--Hose Fitting Color and Material Code
Flared Fittings MIL-F-5509
Color
Material Code
Aluminum Alloy 2014 and 2024(1)
Blue
D (Optional)
Aluminum 7075(1)
Brown
W(T-73)
Steel
Black
Copper Based Alloys
Natural
Cadmium
Plate if Applicable
Corrosion Resistant Steel
None
Class 304
J
Class 316
K
Class 347
S
Titanium Alloys
Gray
T
Flareless Fittings MIL-F-18280
Color
Material Code
Aluminum Alloy 2014 and 2024
Green
D
Aluminum Alloy 7075
Brown
W (T-73)
Carbon Steel
Yellow (result of
Chromate treatment)
4130 Steel Forging
F
Stainless Steel
Natural Finish
Class 304
J
Class 316
K
Class 347
S
Titanium Alloy
Gray
T
NOTE
(1) Duplex steel may distort color of aluminum anodize.
assembly. This band identifies the assembly manu-
IDENTIFICATION OF HOSE ASSEMBLIES
facturer's code or trademark and military specification
All hose assemblies are identified by tags, bands, or
(MS) part number, including dash size, operating
tapes. Some identifications are permanently marked
pressure (in pounds per square inch, psi), date of
while others are removable. Removable tags, bands, or
assembly (in quarter and year), hose manufacturer's
tapes should not be installed on hose assemblies located
code number (if different from assembly manu-
inside fuel and oil tanks or in areas of an aircraft where
facturer), and the cure date of the hose manufacturer (in
tags, bands, or tapes could be drawn into the engine
quarter and year).
intake. Hose assemblies are either commercially
The assembly date is indicated by the letter A,
manufactured or locally fabricated.
followed by the quarter of the year, the letter Q, and
ends with the last two digits of the year. For example,
Commercially Manufactured
hose assemblies fabricated during June 1980 are
marked A2Q80. When a decal or band is used that
Commercially manufactured hose assemblies are
states "assembly date," the A may be omitted. Assem-
made from synthetic rubber or Teflon. The assem-
bly date information is also indicated on the unit,
blies are identified by a band near one end of the
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