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Page Title:
Selection of specifications and standards |
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|  MIL-T-6396E
3.3 Selection of specifications and standards. Specifications and standards
for necessary commodities and services not specified herein shall be selected
in accordance with MIL-STD-143.
3.4 Materials. The materials used in the manufacture of non-self-sealing
tanks shall be suitable for the purpose intended and shall conform to
applicable Government specifications. The use of magnesium is prohibited.
Where applicable Government specifications do not exist, contractor's
specifications may be used provided the contractor assumes full responsibility
for the use thereof. The use of contractor's specifications will not
constitute waiver of Government inspection.
3.4.1 Metals. Metals shall be of the corrosion-resistant type or suitably
treated to resist corrosion due to fuels, salt fog, or atmospheric conditions
likely to be met in storage or normal service.
3.4.1.1 Dissimilar metals. Unless suitably protected against electrolytic
corrosion, dissimilar metals in accordance with MIL-STD-889 shall not be used
in intimate contact with each other.
3.4.2 Castings. Castings shall be in accordance with MIL-C-6021. Class 4
shall be applicable unless specified otherwise by the contractor or acquisition
activity.
3.5 Desire
3.5.1 General. Tanks shall be designed for satisfactory service life; shall
be suitable for use with the fluid for which they are intended; and shall be
designed in conjunction with the containing structure to avoid a concentration
of loads on splices, seams, fittings, or the location of concentrated flexure.
The design of the tank assembly and aircraft structure in which it is mounted
shall comprise the necessary strength to provide adequately for the stresses
caused by the following:
a.
Flexing resulting from vibration
b. Impact loads incident to take-off, taxiing, and landing (including
catapulting and arresting)
c. Positive and negative pressures associated with hydraulic surge of' fluid
incident, to all dynamic conditions of flight, including catapult and arrested
landing, if any.
d.
Pressure loads imposed by:
(1) Hydrostatic head of fuel during level flight or maneuvers
(2) Pressurizing or inerting gases
(3) Proof and ultimate pressures as designated by the contractor or
acquisition activity
(4) Hydraulic surge of fuel incident to gunfire, where type II, class B
instructions are used
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