scope:

This is an advance copy of the dated document. The final document from Defense Printing Service may be slightly different in format due to electronic conversion process. Actual technical content will be the same.

This specification sheet is approved for use by all Departments and Agencies of the Department of Defense.

The requirements for acquiring the color filters described herein shall consist of this specification sheet and MIL-PRF-22885.

Design and construction: See figure 1.

Intended use: For use with 4-lamp (T-1 ¾ midget flanged base) illuminated push button switches of MIL-PRF-22885/9, MIL-PRF-22885/15 and MIL-PRF-22885/87.

Classification: See MIL-PRF-22885/9, MIL-PRF-22885/15 and MIL-PRF-22885/87.

Illuminated color: See table I. Spectrographic method shall be used.

Luminance: See table I.

Marking: Identification marking shall be on unit package or tag.

Inspection:

Group A: Inspection for dimensions.

Group B and qualification: As part of MIL-PRF-22885/9, MIL-PRF-22885/15 or MIL-PRF-22885/87 switch inspection. One additional sample (4 color filters) per color required for color fade test.

Color fade test: Four T-1 ¾ midget flange base lamps, industry number 328, or equivalent shall be installed in the test fixture. The test fixture shall operate at 5 ±0.2 volts continuously for a period of 300 hours at room ambient. At the completion of this test, the colors must remain within the limits specified in table I.

The color fade test fixture shall consist of one MIL-PRF-22885/10 or MIL-PRF-22885/16 modular indicator light for each color of filter to be tested, mounted in a suitable panel.

Part number: M22885/12- (dash number from table II). TABLE II. Dash number and color code.

Dash number Color Code ----------------------------------- 01 Blue B 02 Green G 03 Red R 04 White W 05 Yellow Y

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