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|  MIL-T-26219A
3.4 Material. Materials shall conform to applicable specifications as
specified herein. When materials are used which are not specifically
designated, they shall be entirely suitable for the purpose.
3.4.1 Metals. Metals shall be of the corrosion-resistant type, unless
suitably protected to resist corrosion during storage and normal service use.
3.4.2 Dissimilar metals. Unless suitably protected against electrolytic
corrosion, dissimilar metals shall not be used in intimate contact with each
other,
Dissimilar metals are defined by MIL-STD-889.
3.4.3 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 acquiring activity.
However, if they will be used in a hermetically
sealed inclosure, fungicidal treatment will not be necessary.
3.4.4 Protective treatment. When materials are used in the construction
of the test set th at 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
of any protective coating that will crack, chip, or scale with age or extremes
of climatic and environmental conditions shall be avoided.
3.5 Design and construction. The test set shall be designed as a portable
unit suitable for testing aircraft tachometer indicators and generators. A
precision speed reference (rotational speed indicating system) shall be
incorporated for monitoring the output speed of the variable drive. A
standard four pole aircraft tachometer generator shall be incorporated within
the test set for driving aircraft tachometer indicators under-going test.
Provisions shall be incorporated for testing aircraft tachometer generators
individually by the resistance load-output voltage method. Provisions shall
also be incorporated for permitting individual generators underdoing test to
be electrically connected to respective aircraft tachometer indicators.
Specification MIL-G-8512 shall be used as a guide in the design of the test
set.
The construction of the test set shall be mechanically and electrically
sound, suitable for the intended purpose, and shall be such as to give
permanence in the accuracy of the measurements and stability in the ouput
speeds of the variable drive. The design and construction of the test set
shall take into account the temperature, humidity, vibration and operational
requirements specified herein.
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