MIL-DTL-6396F
questions regarding the acceptability of tanks cannot be resolved by non-destructive tests. Tanks
selected by the procuring activity shall be dissected as shown on figure 1 and tested as required
in 4.5.3.
4.3.2.4 Defect investigation and retest. When a defective test sample unit occurs, the
procuring activity shall be promptly notified and acceptance of all units after the last group of
accepted units shall be withheld until the extent and cause of failure have been determined and
corrected. Sampling shall then return to a rate specified by the procuring activity. In the event
that chronic deficiencies are disclosed, the contingency option of 4.3.2.3.2 shall be invoked to
assist in resolution of the problems.
4.4 General test conditions.
4.4.1 Test fluids. Test fluids used in the design process shall include, but not be limited to,
those described in ASTM-D471 (Ref Fuels A and B), and MIL-PRF-680, Type II, JP-5 and JP-8
aviation fuel.
4.4.2 Tank mounting structure.
4.4.2.1 Type II tanks. The mounting structure shall be either the applicable portion of the
actual aircraft structure or a simulated structure. If a simulated structure is used, it shall
duplicate the shape and dimensions of the tank supporting structure in the aircraft. The
preferred structure is an aircraft structure, however, the procuring activity can allow the use of a
simulated structure fit for the intended use.
4.4.2.2 Type I and III tanks. The mounting structure shall be either the applicable portion of
the actual aircraft structure or a simulated structure. If a simulated structure is used, it shall
duplicate the shape, dimensions, and material of the tank supporting structure in the aircraft. The
necessary stops, cushions, hangers, and pads, identical with those used in the finished aircraft,
for mounting and supporting the tank, shall be provided. The test tank shall be capable of being
installed and removed in the mounting structure in an identical manner to that used in the actual
aircraft installation.
4.4.3 Support jig. The jig shall support the tank mounting structure as specified in 4.4.2 to
simulate the actual aircraft installation. The support jig shall be strong enough to carry the
mounted sample tank and designed for bolting to the vibrator and rocker assembly. The jig
framework shall be rigid enough to prevent the possibility of additional stresses being imposed
on the mounted tank due to flexure of the jig framework.
4.5 Inspection methods.
4.5.1 Examinations.
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