MIL-DTL-5578D
test method is an aircraft structure, however, the procuring activity can allow the use of a
simulated structure.
4.4.4 Tank support jig. The jig shall support the tank mounting structure as specified in
4.4.3 to simulate actual aircraft installation. The support jig shall be strong enough to mount the
sample tank and designed for bolting to the vibrator and rocker assembly. The jig framework
shall be rigid to prevent additional stresses on the mounted tank due to flexure of the jig
framework.
4.5 Test methods.
4.5.1 Inspection.
4.5.1.1 Examination. Each fuel cell shall be examined to determine conformance with all
the requirements of this specification for which no specific tests are described and to determine
conformance with the manufacturer's material and fabrication specifications.
4.5.1.2 Workmanship. The fuel cells shall be inspected to determine conformance to the
requirements listed in MIL-STD-801 and as specified by the procuring activity.
4.5.1.3 Dimensions. A check shall be made on each cell to ensure that all dimensions
critical to the installation are within the dimensional tolerances established by the contractor or
procuring activity. The tolerances specified for this test shall not conflict with the capacity
requirements specified in 3.4.2.
4.5.1.4 Weight. Each cell shall be weighed to determine compliance with the tolerance on
weight (see 3.7).
4.5.2 Stand. Class A cells only shall be collapsed and held strapped for 30 minutes in a
position comparable to that encountered prior to installation in its respective aircraft cavity, then
released, and adequately supported. Both class A and class B cells shall be filled with fluid as
specified by the procuring activity. During the filling process, the capacity test (see 4.5.7) shall
be conducted to determine conformance with 3.4.2. Test temperature shall be above 65 ºF
(18 ºC). Cells shall then be tested in accordance with the following time cycle:
a. First cell selected ----------------- 10 days
b. Second cell------------------------- 10 days
c. Third cell--------------------------- 10 days
This time cycle shall be repeated for additional cells chosen in accordance with 4.3.2.2 for the
duration of the contract. Upon completion of the test and at the intermediate inspections, the
cells shall be carefully examined for any evidence of failure. After the examination, if any
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