MIL-PRF-81380E
3.5.11 Performance after extended flow test. Using fuel containing all required additives
(see 4.4.3.3), the filter/monitor element shall not pass water in excess of 5 ppm when tested in
accordance with 4.5.2.7.
3.5.12 Environmental requirements.
3.5.12.1 High temperature. The fuel filter/monitor housing and elements shall withstand
storage without deterioration in temperatures as high as 160 °F (71 °C) when subjected to the test
specified in 4.5.3.1. They shall also permit rated flow in ambient temperatures as high as 125 °F
(52 °C).
3.5.12.2 Low temperature. The fuel filter/monitor housing and elements shall withstand
storage without deterioration in temperatures as low as -50 °F (-46 °C) when subjected to the test
specified in 4.5.3.2. They shall also permit rated flow in ambient temperatures as low as -25 °F
(-32 °C).
3.5.12.3 Fuel immersion. The filter/monitor element shall show no evidence of swelling,
corrosion, separation of components, dissolving of adhesives, or deformation, which could cause
failure during operation after being immersed in inhibited fuel conforming to section 4.4.3.3, and
tested in accordance with 4.5.3.3.
3.5.13 Post-environmental. The filter/monitor housing subjected to the conditions of
3.5.12.1 and 3.5.12.2 shall operate without failure when tested in accordance with 4.5.4. The
filter/monitor elements subjected to the conditions of 3.5.12.1 and 3.5.12.2 shall operate without
failure when tested in accordance with 4.5.5.
3.6 Identification. An identification plate shall be securely attached to the filter/monitor
housing. The plate shall not be affected by water, sunlight, aviation fuel, or the temperatures
specified in 3.5.12.1 and 3.5.12.2. The contractor shall select the material, size of lettering, and
size of the plate. The identification plates covered in MIL-DTL-15024 are recommended, but are
not mandatory. The identification plate shall contain the following information:
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