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|  MIL-P-5238C
failure occurs, the chamber temperature shall be raised in 20F steps up to
a maximum of
At the conclusion of the test at each temperature level,
the chamber atmosphere shall be exploded.
4.5.23.3 Overspeed. Some negative G tests (sudden unloading) are accomplished
as a part of the normal First Article tests, but wherever the safety analysis
indicates some additional tests are necessary, they shall be accomplished. For
hydraulic powered units where a speed control device is used (whether integral
or separate) sufficient tests shall be conducted to determine the possible
effects of an inoperative speed control.
4.5.23.4 Dragging impeller. Apply a braking load on the pump which provides
the same slow down and heat input effects of a dragging impeller. Adjust the
drag until the no flow output pressure is less than 50 percent of normal. The
fuel and air shall be at the high temperatures of 3.2.4. The fuel level shall
be 1/4 to 1 inch above the rated flow pump down limit of 4.5.7. Operate the
pump at this no flow condition for a minimum of 15 minutes or until temperatures
stabilize on surfaces in contact with fuel or fuel vapor. At this point open
up the outlet valve and allow the pump to deplete the tank until it is operating
dry. Continue operation for at least 10 minutes. At no time during the entire
test shall any point on surfaces in contact with fuel or fuel vapors exceed
or less, in accordance with the detail specification.
4.5.23.5 Pressure tests. Proof and burst pressure tests shall be conducted
on the hydraulic components in accordance with the pressure schedules of
MIL-H-5440 and MIL-H-8891 as applicable.
4.5.24 Water in the fuel. The pump shall demonstrate its ability to operate
in fuel containing .75 cc excess water per gallon. The room temperature test
shall be conducted with all pumps. The icing test shall be conducted as required
by the detail specification.
4.5.24.1 Conditioning of fuel. Free water shall be added to the fuel for
preconditioning, in accordance with the following procedure:
Warm fuel to 80F
a.
b. Slowly add 1cc of water per gallon of fuel while the fuel is being
circulated or agitated.
c. Agitate the fuel and water mixture for at least 2 hours. If the fuel
is being circulated to mix, the entire quantity should be circulated at
least three times.
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