MIL-L-27160 (USAF)
3.3.8 Knobs and lettering. Unless otherwise specified in the applicable instrument specification, all indicia associated with instrument knob positions and all lettering on the instrument face shall be illuminated. The brightness range shall be as specified herein.
3.4 Indicia. The presentation may be combination of white, black, and gray as specified in the applicable instrument specification. Unless otherwise specified in the applicable instrument specification, the colors shall conform to Table I.
Table I. Colors
Color |
Color No. as listed in FED-STD-595 |
White |
37875 |
Black |
37038 |
Gray |
36440 |
3.5 Contrast. Contrast between the white and black portions of the indicator scale shall be 12 or greater. Contrast between the gray and black portions of the indicator scale shall be five or greater. Contrast, C, is defined as:
C = B2 - B1
B1
Where: B2 is the brightness of the gray or white, and B1 is the brightness of the black portions of the instrument scales.
4. QUALITY ASSURANCE PROVISIONS
4.1 Responsibility for inspection. Unless otherwise specified in the contract or purchase order, the supplier is responsible for the performance of all inspection requirements as specified herein. Except as otherwise specified in the contract or order, the supplier may use his own or any other facilities suitable for the performance of the inspection requirements specified herein, unless disapproved by the Government. The Government reserves the right to perform any of the inspections set forth in the specification where such inspections are deemed necessary to assure supplies and services conform to prescribed requirements.
4.2 Classification of tests. The inspection and testing of systems shall be classified as follows:
a. Qualification or preproduction tests as specified in the applicable instrument specification.
b. Quality conformance tests.
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