MIL-DTL-5578D
(a) A sufficient number of test cubes to fit the metal structure shown on figure 1 with
panels representative of the host cavity as specified by the procuring activity. The
test cubes configuration and fitting(s) shall be as specified by the procuring
activity.
(b) Eight side panels as specified by the procuring activity.
.
(c) Eight sheets of backing material 27 by 30 inches and two sheets of backing
material 30 by 30 inches.
(d) Two 12 by 12-inch samples of composite cell construction.
(e) One sample of inner-layer ply, without barrier, approximately 900 square inches
in area with seam (self-sealing portion only).
(f) One sample of inner-layer ply, with barrier, approximately 900 square inches
in area without seam (self-sealing portion only).
(g) One sample 6 by 6 by 0.075 to 0.125 inch inner-layer ply without barrier.
None of these samples shall be pre-plasticised with fluid prior to submission. Any variations in
the basic construction shall be approved by the procuring activity and shall be identified by a
suitable dash numbering system.
4.2.1.2 Phase I tests. Phase I first article tests shall consist of the following described under
4.5:
a. Inspection --------------- 4.5.1
b. Inner-layer ply ---------- 4.5.4
c. Test cubes --------------- 4.5.5
4.2.2 Phase II first article testing. Phase II testing shall consist of those tests performed on
complete full-scale fuel tanks submitted for approval as satisfactory tanks for a particular aircraft
installation.
4.2.2.1 Phase II test samples. Phase II test samples shall consist of one or more complete
full-scale fuel tanks and the supporting structure or jig, or both, equipped with all applicable fuel
cell components. The tank or tanks shall be of the same materials and construction as used in the
cell submitted for phase I tests, and shall be designed to fit in a particular location of a specific
aircraft. Exceptions to the above shall comprise those cells which, because of the particular
aircraft design, require the use of graduated wall thickness and weight, and any other exceptions
specifically authorized by the procuring activity.
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