FED-STD-228A
where:
D1=the diameter over the armor at the point measured, inches.
D2=the diameter over the core at the point measured, inches.
5.2 Unless otherwise specified in the detail specification, two specimens, one from each end of the
inspection unit, shall be tested.
5.3 The average thickness of the armor of the inspection unit shall be the average of the results obtained
from the specimens tested.
5.4 The minimum thickness of the armor of the inspection unit shall be the smallest of all values
averaged in determining the average thickness, 5.3.
5.5 The average thickness and minimum thickness of the armor of the inspection unit shall be recorded
to the nearest mil or 0.0001 inch.
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