MIL-DTL-25308C
3.1.6 Protective treatment. When materials are used in the construction of the gage that are
subject to deterioration when exposed to climatic and environmental conditions likely to occur
during service usage, they shall be protected against such deterioration in a manner that will in
no way prevent compliance with the requirements of this specification. The use of any
protective coating that will crack, chip, or scale with age or extremes of climatic or
environmental conditions shall be avoided.
3.1.7 Fungus proof materials. Materials that are nutrients for fungi shall not be used where it is
practical to avoid them. Where used and not hermetically sealed, they shall be treated with a
fungicidal agent acceptable to the procuring activity.
3.2 Design and construction. The gage shall be designed to indicate directly the pressure in
aircraft hydraulic and pneumatic systems. The gage shall be so constructed that no parts will
work loose in service and shall be built to withstand the strains, jars, vibrations and other
conditions incident to shipment, storage, installation and service.
3.2.1 Pivots, bearings and gears. Pivots, bearings and gears shall neither bind nor shake and
shall be as frictionless as practicable.
3.2.2 Adjustment mechanism. When the gage is so designed as to permit adjustment, it shall be
provided with a means for adjusting or correcting the indications which shall be simple to
manipulate and so designed that adjustments can be made without the use of special tools. The
means of adjustment need not be outside the case.
3.2.3 Separate mechanism. The gage mechanism shall be comprised of units distinct from the
case. The gage shall be sufficiently rugged that small distortions of the case will not affect
accuracy of the indication.
3.2.4 Reliability. The gage shall have a minimum acceptable mean-time-between-failures
(MTBF) of 2,000 hours based upon a discrimination ratio of 1.5 and a confidence factor of 90
percent.
3.3 Performance. The gage shall operate satisfactorily after subjection to the following
conditions:
a.
Temperatures operating temperatures ranging from -54°C to +100°C (-65°F to +212°F)
and non-operating temperatures ranging from -65°C to +145°C (-85°F to +293°F).
b.
Vibration vibration of 2g from 5 to 500 Hz.
c.
Temperature-altitude pressure altitude of 100,000 feet at -55°C (-67°F).
d.
Salt fog exposure to salt sea atmosphere for 48 hours without evidence of corrosion or
deterioration.
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