MIL-DTL-5578D
4.2 First article. First article inspection shall consist of phase I and phase II tests. (See
4.2.1.2 and 4.2.2.2.) For previously approved fuel cells, conformance inspections of 4.3.1 shall
apply.
4.2.1 Phase I testing. Phase I tests shall consist of the tests (see 4.2.1.2) performed on
materials and construction samples (see 4.2.1.1) used in the manufacture of self-sealing or dual
construction fuel cells.
4.2.1.1 Phase I test samples. All phase I test samples shall meet the requirements for phase I
testing as specified in MIL-DTL-6396 and the following:
a. Class A (flexible construction)
1. Protection levels (A) and (B)
(a) A sufficient number of test cubes to fit the metal structure shown in figure 1 with
panels representative of the host cavity as specified by the procuring activity. The
test cube 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 6 by 6 by 0.075 to 0.125-inch inner-layer ply without barrier.
b. Class B (semi-rigid or self-supporting construction)
1. Protection levels (A) and (B)
(a) A sufficient number of test cubes to fit the metal container shown in figure 1 or as
defined by the procuring activity. The test cube configuration and fitting(s) shall
be as specified by the procuring activity.
(b) Two 12 by 12-inch samples of composite cell construction.
c. Class A or B
1. Protection levels (C) or (D)
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