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|  MIL-S-25980A(USAF)
Room temperature .- The room temperature endurance test shall be
4.6.16.1
conducted et room temperature using a suitable test fluid. At the end of the
test period, the low specific gravity test shall be performed in accordance with
4.6.3.1
4 . 6 . 1 6 . 2 A l t i t u d e . - The altitude endurance test shall be conducted at a
simulated altitude of 80,000 feet, except that the ambient temperature shall be
room temperature.
Fuel conforming to grade JP-4 of MIL-J-624 shall be used and
shall not be weathered. The low specific gravity test shall be performed at the
beginning and end of the test period in accordance with 4.6.3.1.
4.6.16.3 Low
temperature
The low temperature endurance test shall be
q 2 F. A suitable test
conducted using a fluid and ambient
fluid shall be used. At the end of the test period, the low specific gravity test
shall be performed in accordance with 4.6.3.1.
The high temperature endurance test shall be
4
.
6
.
1
6
.
4
~
*
-
conducted, using a fluid and ambient temperature of 158 *2 F. A suitable test
fluid shall be u s e d . At the end of the teat period, the low specific gravity test
shall be performed in accordance with 4.6.3.1.
4.6.16.5 Contamination fuel.-
The contaminated fuel endurance test shall be
conducted at room temperature using a suitable test fluid and contaminant as
specified in MIL-F-8615. The test fluid and contaminant shall be circulated. At
the end of the test period, the low specific gravity test shall be performed in
accordance with 4.6.3.1
uid dynamic loading - That portion of the float switch projecting
4.6.17
into the fuel and subjected to fluid force as a result of fuel movement shall be
tested as follows: A mechanically simulated fluid loading of 5 psi of projected
area shall be alternately applied on opposite sides of the projecting member normal
to the major axis at a rate of 12 cycles per minute for a 10-hour period. At the
end of the test period, there shall be no evidence of failure or distortion and the
low specific gravity test shell be performed in accordance with 4.6.3.1.
I
resistance and low tempe rature.- The float switch shall be sub-
4.6.18 Fuel
jected to the applicable fuel resistance and 1 ow temperature test as specified in
MIL-E-8615
4.6.19 Weight.- The float switch shall be weighed in a dry condition. The
weight shall not exceed the weight shown on the manufacturer's drawing.
D i s a s s e m b l y After completion of all preproduction
4.6.20
tests, the float switch shall be disassembled and inspected. There shall be no
evidence of failure, deterioration, or undue wear which might affect performance
of the switch.
PREPARATION FOR DELIVERY
5.
5.1 Float switches shall be prepared for delivery in accordance with
I
MIL-P-7936. Preservation for level A shall be Method IA of MIL-P-116. Unit
quantities shall be one each.
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