MIL-DTL-6396F
4.2.1 Phase I: First article inspection (Type II and III tanks only). Phase I inspections shall
be those tests performed on construction samples (see 6.4.1) to be used in tank manufacture and
listed in table II. The phase I test samples are listed in 4.2.1.1 and testing is described in 4.5.
4.2.1.1 Phase I: Test samples (Type II and III tanks). Phase I test samples shall consist of:
a. The number of phase I test cubes (tanks) required for each type and class are:
Type and Class
Number of Test Cubes
Type II, Class A
2
Type II, Class B
3
Type II, Class C
2
Type III
2
b. Each Type II (all classes), phase I test sample shall have the following characteristics:
1. Test cubes with outer dimensions of 24 by 30 by 30 inches and necessary fittings
as specified by the procuring activity.
2. Eight side panels constructed to simulate the aircraft structure.
3. One sample of inner layer ply, without barrier, approximately 900 square inches
in area including seam.
4. Two samples of 6 by 6 inch inner layer ply, without barrier.
5. Three permeability samples consisting of the inner liner and fuel barrier (if
required).
6. One sample of 12 by 12 inch outer layer ply.
c. Each Type II, Class B, phase I test sample shall also include eight sheets of backing
material 27 by 30 inches and two sheets of backing material 30 by 30 inches.
d. Each Type III, phase I test sample shall include a test cube with outer dimensions of
24 by 30 by 30 inches with the necessary fittings and shall also include three 12 by 12
inch samples of type III composite tank construction.
e. Phase I test samples of all types and classes shall not be altered or pre-plasticized
prior to testing.
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