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This recommended practice covers the requirements for the types of glass to be utilized in the fabrication of cover glasses and lighting wedges used in aerospace instruments. It defines the maximum extent of physical defects and recommend standard methods of inspection and evaluation. Definitions of terminology used in this document are covered in Appendix A.

This document is intended to cover the design of plastic lighted panels, mounting plates, and their installation.

This recommended practice covers the general requirements and test procedures recommended for use with white incandescent integrally lighted instruments. Its use should provide uniformity of illumination from instrument to instrument and legibility under daylight operation. An appendix is provided to familiarize the designer with some of the techniques used to obtain uniformity of color and illumination in various types of instruments.