If difficulty is encountered in obtaining maximum Reid Vapor Pressure
fuel as defined by fuel specification, it is permissible to mix a more
volatile fuel, such as JP-3 or AvGas, with the test fuel until the
correct RVP is obtained.
4.6.6 Fuel Resistance, Extreme Temperature and Icing Tests - The fuel resist-
ance, extreme temperature, and icing tests shall be conducted in accordance with
the appropriate tests specified in MIL-F-8615.
4.6.7 Accelerated Corrosion - (This test may be abbreviated or deleted when it
can be demonstrated that all materials Individually and in contact in the assembly,
are not subject to any manner of corrosive deterioration, whether chemical,
electrolytic or stress accelerated. )
The complete pump with all fuel ports open, shall be submerged in a saturated
salt solution. The unit shall then be drained for 30 seconds to remove trapped
The component shall be placed immediately in a test chamber
maintained at a temperature of 30°
4°F) with a relative humidity of
100 percent for a period of 1200 seconds. Upon completion of the humidity expos-
ure period, the unit shall be placed in an air oven maintained at a temperature
of 55° to 60° (131°F to 140°F) for a period of 1200 seconds. The component
shall not be operated again until a total of 60 immersions, high humidity, and
drying cycles have been completed.
Immediately after completion, the component
shall be washed with warm water, dried, wetted with fuel, and actuated as in
4.6.8 Endurance - Unless otherwise specified in the model specification, the
endurance test shall be as specified in MIL-F-8615.
Contaminated fuel test. This test is applicable to all components
required to perform the endurance test per MIL-F-8615, paragraph 4.5.12.
Water and icing. Tests shall be accomplished to demonstrate perform-
ance as required by the item specification. The tests shall be conducted as
specified in paragraph 4.5.17 through 18.104.22.168 of MIL-F-8615, and in accordance
with paragraph 3.8.8 Water and ice requirement of this specification.
Negative G Cycling Test (Applicable to pumps with negative "g" inlet
valving only.) - With ejector mounted and operating at the optimum design point,
the ejector shall be alternately subjected to 1 "g" normal and 1 "g" negative at
a rate of one cycle per minute for 500 cycles. At any time during the cycling,
performance shall be as required by the model specification. The tank shall be
arranged so that the upper inlet is uncovered for the plus one "g" and the lower
inlet is uncovered during the negative one "g" operation. The inlet valve shall
operate smoothly from normal to negative "g" position in not more than 3 seconds
after reversal of the "g" force.