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|  MIL-T-6396E
4.5.2 Tank mounting structure
4.5.2.1 Type II tanks. The mounting structure shall be the applicable portion
of the actual aircraft structure with the fuel tank installation identical to
the actual aircraft installation. In the case of the stand test, a simulated
structure may be used.
4.5.2.2 Types 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.
4.5.3 Support jig. The jig shall support the tank mounting structure as
specified in 4.5.2 to simulate the actual aircraft installation. The support
jig shall be a strongly constructed framework of metal, suitable for carrying
the mounted sample tank and designed for bolting to the vibrator and rocker
assembly. The jig framework shall be sufficiently rigid to prevent the
possibility of additional stresses being imposed on the mounted tank owing to
flexure of the jig framework.
4.6 Inspection methods
4.6.1
Examinations
4.6.1.1 Examination of product. Each tank shall be carefully examined to
determine conformance to all the requirements of this specification for which
no specific tests are described and to determine conformance with approved
manufacturer's material, fabrication, and inspection specification, and
applicable drawings.
4.6.1.2 Workmanship. Each tank shall be inspected to determine that the
workmanship conforms to MIL-STD-801.
4.6.1.3 Dimensional. A check shall be made on each tank to insure that all
dimensions critical to the installation are within the dimensional tolerances
established by the contractor or acquisition activity. The tolerances
specified for this test shall not conflict with the capacity requirements
specified in 3.5.2.
4.6.1.4 Weight. The weight of each finished tank shall be checked to
determine compliance with 3.5.3.
4.6.1.5 Leakage. The tank, with all openings sealed and with a minimum of
external support necessary to maintain the tank shape, shall be subjected to
the internal air pressure specified in the manufacturer's approved inspection
specification. Then the tank shall be completely submerged in water or covered
with soapy water. Leakage, as indicated by the presence of air bubbles forming
in the water or soapy water solution, shall be cause for rejection. If
approved by the acquisition activity, other acceptable leakage tests include a
-ammonia test or an unconfined liquid stand test using the
approved test fluid applied at room temperature for 24 hours with a head
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