MIL-PRF-87260B(USAF)
APPENDIX A
using JP-5 or Jet A, as long as the properties of the fuel are documented and within
specification limits (MIL-DTL-83133, MIL-DTL-5624, or ASTM D1655 as applicable). A
minimum of three test runs lasting five to twenty minutes shall be run on each foam type and
configuration. The three runs can be run consecutively starting with dry foam at the beginning
of each sequence (three tests). A 5-minute (minimum) down time shall be maintained between
test runs for charge relaxation, appropriate data measurements, and test tank should be done at
a low temperature and relative humidity to enhance static electricity generation. Specifically,
temperatures below 50°F and 50 percent relative humidity are desirable; however, if these
conditions cannot be attained, then it will not be a limiting factor for conduct of the testing. In
order to evaluate the potential effects of temperature on the static electricity generation, it is
recommended that several fuel temperatures be evaluated and an optimum set of conditions
chosen for the final evaluation of the conductive foam. These include the following
temperatures: 160, 60, 30, 10, 0, -15, -25, -30°F. The test fuel temperature is defined as the
temperature at which the bulk fuel shall be at the start of a test run. If an ignition occurs during
a test, the drum shall be opened and the damaged foam replaced and photographed.
A.5. TEST FOAM TYPES AND CONFIGURATIONS
Baseline foam tests should be run on orange and blue MIL-DTL-83054, Types II, IV or V
polyester and foams to demonstrate the electrical charge generation/ignition characteristics of
the material and measurement capability of the test rig instrumentation. Two test configurations
shall be run: (a) fully packed, and (b) "over the wing" refueling inlet simulation. The test tank
void should be four inches in diameter and centered under the nozzle inlet. A one- to two-inch
ullage shall also be provided just above the foam cylinders in the test tank. Fuel impingement
tests should be run on each porosity type of foam being qualified, that is, coarse and fine pore
or Types I and II respectively. Also, both configurations, fully packed and "over the wing"
voiding, shall be evaluated on each type of foam being qualified unless it can be shown that the
fully packed condition is a worse case.
A.6. TEST DATA AND DOCUMENTATION
Prior to any conduct of testing, a test procedure shall be written and submitted for approval.
Photographs of the test setup and instrumentation shall be included if available. Typical test
Copies of data traces shall also be provided with adequate labeling and identification.
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