MIL-DTL-27190C
3.10 Workmanship. Particular attention shall be given to neatness and thoroughness of
soldering, wiring, impregnation of coils, welding, riveting, brazing, plating, painting, machine
screw assemblies, and freedom of parts from burrs and sharp edges. Gears shall be of high quality
and shall provide a minimum of backlash necessary for smooth operation. Where necessary,
antibacklash techniques shall be used.
4. VERIFICATION
4.1 Classification of inspections. The inspection requirements specified herein are
classified as follows:
a. Qualification inspection (see 4.3).
b. Conformance inspection (see 4.4).
4.2 Inspection conditions. Unless otherwise specified, all inspections shall be performed
in accordance with the test conditions specified in 4.2.1 through 4.2.5.
4.2.1 Standard atmospheric conditions. Wherever the pressure and temperature existing
at the time of the test are not specified, that test shall be made at atmospheric pressure
(approximately 29.92 inches of mercury (Hg)) and at room temperature (approximately 25 °C).
When tests are made with atmospheric pressure or room temperature differing from these values,
proper allowance shall be made for the difference from the specified conditions.
4.2.2 Attitude. Unless otherwise specified, the indicator shall be tested in the normal
operating position with the plane of the dial vertical.
4.2.3 Electrical power. Unless otherwise specified, the indicator shall be tested with
26 V ± 1 V, single phase, 400 cps ± 5 cps, AC power, and with 4.5 V ± 0.5 V AC or DC applied
to the lighting circuit.
4.2.4 Tapping. Unless otherwise specified, the indicator shall be lightly tapped or
vibrated before each reading.
4.2.5 Integral lighting. The integral lighting tests shall be conducted in accordance with
MIL-L-27160 in the sequence specified.
4.3 Qualification inspection. The qualification inspections shall consist of all the tests
specified under 4.5.
4.3.1 Nonstandard parts data approval. When nonstandard electronic parts are used in
the construction of the indicator, nonstandard parts data approval shall be a prerequisite to
qualification approval.
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