MIL-DTL-25524E(USAF)
4.5.2 Chemical and physical tests. To determine conformance to chemical and physical requirements (see 3.3)
tests shall be conducted in accordance with the applicable test methods (FED-STD-791 or ASTM), listed in table I,
except for those specified herein.
4.5.2.1 Thermal stability. The thermal stability test shall be conducted using ASTM D3241 (JFTOT). The heater
tube shall be rated using the Alcor Mark 8A or Alcor Mark 9 Tube Deposit Rater (TDR) (see 4.5.2.1.2a).
4.5.2.1.1 Stability test conditions.
a. Heater tube temperature at maximum point: 335C (635F)
b. Fuel system pressure: 3.43 MPa (500 pounds/square inch of gravity)
c. Fuel flow rate: 3.0 milliliter/minute
d. Test duration: 150 minutes.
4.5.2.1.2 Stability test results. The fuel sample is acceptable, if all the following criteria are met:
a. The maximum differential between the post-test and pre-test Alcor Mark 8A or Mark 9 TDR rating does not
exceed 12 TDR units. Both before and after the JFTOT test, the heater tube shall be rated at 1 millimeter (mm)
increments over the length of the heater tube that can be rated using the Alcor Mark 8A or Mark 9 TDR. The
maximum increase in the TDR ratings (i.e., the maximum difference seen between the post-test and the pre-test
TDR rating) shall be reported. If the maximum increase in TDR rating does not exceed 12 TDR units, the results
are satisfactory.
b. The maximum differential pressure across the test filter does not exceed 25 mm of mercury.
4.5.2.1.3 Reported data. The following data shall be reported.
a. Tube deposit TDR ratings.
b. Differential pressure across the test filter.
4.5.3 Storage stability. The storage stability test on the finished fuel shall be conducted by placing 200 3.8
liters (53 1 gallons) in a 208-liter (55-gallon), 18-gauge DOT 17E uncoated steel drum. The filled drum shall be
stored at 54.5C (130F) for 1 year (12 months). At 3-month intervals, samples shall be withdrawn and subjected
to the thermal stability test (see 4.5.2.1). At the conclusion of the 12-month storage stability test, the fuel will be
subjected to all test requirements of table I. If the fuel fails any of the 3-month thermal stability tests, the fuel
shall be resampled and retested to insure the initial sample was valid. Failure of the thermal stability test at any of
the 3-month intervals or failure of any of the table I test requirements at the conclusion of the 12-month storage
stability test constitutes a failure of the storage stability test (4.3.2.3). The Air Force Research Laboratory Fuel
Branch (AFRL/PRSF), Bldg 490, 1790 Loop Road N, Wright-Patterson AFB OH 45433-7103, will conduct this
test.
4.6 Test report. Test data required by 4.5.2 shall be reported in the same order as listed in table I, unless directed
otherwise by the Procuring Activity.
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in the contract or order
(see 6.2). When actual packaging of materiel is to be performed by DoD personnel, these personnel need to contact
the responsible packaging activity to ascertain requisite packaging requirements. Packaging requirements are
maintained by the Inventory Control Point's packaging activity within the Military Department or Defense
Agency, or within the Military Department's System Command. Packaging data retrieval is available from the
managing Military Department's or Defense Agency's automated packaging files, CD-ROM products, or by
contacting the responsible packaging activity.
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