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Page Title:
Fuel line connection and installation |
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|  MIL-T-18847C(AS)
3.5.3.2 Fuel line connection and installation. The tank fuel lines
connections and installation shall be in accordance with MIL-I-18802 and
MIL-F-17874.
3.5.4 Tank construction. For Type I and Type II application, the tank
shall be manufactured from materials approved by the Naval Air Systems
Command. The tank shell shall conform to the design requirements of 3.5.1.
3.5.4.1 Internal structure. The internal structure, such as frames,
beams, and bulkheads, shall be capable of efficiently carrying all the fuel
tank design loads of 3.5.1.5.
3.5.4.1.1 Internal stiffeners, baffles, and check-valves. Internal
stiffeners, baffles, and check valves used shall be located as necessary to
restrict the aft and forward shift of the center of gravity as specified in
3.5.1.4.1.
3.5.4.2 Line contour. The outside diameter of the tank shall be in
accordance with the appropriate drawing.
3.5.4.3 Tank liner. The metallic tank liners or non-metallic tank liners
shall be capable of carrying that portion of the composite design loads
allocated to the liner.
3.5.4.3.1 Metallic liner. The metallic liners shall be constructed of
aluminum or other material as approved by the Naval Air Systems Command and
shall be welded and inspected in accordance with 3.5.4.4 through 3.5.4.7.
3.5.4.3.2 Non-metallic liner. The non-metallic liners shall be
constructed of non-metallic materials that shall take into account-all factors
which affect required strength, rigidity, and structural reliability. The
material shall be fuel compatible and shall be permeability tested in
accordance with MIL-T-6396. The material shall have a high strength-to-weight
ratio with sufficient elastic modulus in the liner to achieve good dimensional
and buckling stability. The fabrication of the liner shall involve state-of-
the-art processes as approved by the Naval Air Systems Command.
3.5.4.4 Welding. Fusion welding on aluminum liners shall be in accordance
with MIL-W-1604. Resistance, spot, and seam welding shall be In accordance
with MIL-W-6858.
3.5.4.5 Welding certification. Welding shall be performed by personnel
certified in accordance with MIL-STD-1595.
3.5.4.6 Welding X-ray inspection. X-ray inspection of welds shall be
performed in accordance with MIL-STD-453 and acceptance criteria shall be in
accordance with paragraph 4.6.2.1.
The external welds shall be inspected
3.5.4.7 Dye penetrant inspection.
in accordance with paragraph 4.6.2.2.
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